YIN Liang , YIN Zhi-wen , WANG Bi-xian , WANG Ya-hong , SUN Dian-feng
2016, 38(S2):183-189. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0183
Abstract:Through many studies on the changes of the amplitude and the spectrum of microtremors in the period of cold air process in the digital broadband date from Gaotai. We also researches on the process of cold air disturbance to the microtremors in time-domain and frequency-domain. Then we discovered that in the process of cold air, the microtremors curve will be a big periodic perturbation or jitter distortion. the process with the cold air from start to finish, the 0.001~0.005 Hz amplitude-frequency value changed greatly,and the process had the characteristic of rapid increase-reach to maximum-dicrease then return to the normal, and the maximum disturbance data will happen at the time of maximum temperature decrease.
GUO Jian-fang , ZHOU Jian-qing , TONG Xin , WANG Jing-jing , ZHANG Si-yuan
2016, 38(S2):190-196. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0190
Abstract:Using multiseparation apparent resistivity observation data obtained from the Changli station in the recent year, the annual variation characteristics of each observation channel is analyzed. We observe that when distance between the observation channels increases, the annual variation characteristics differ. The observed data is compared with the theoretical value, and the error is less than one; the error of the first and the second layer is larger than that of the subsequent layers. Finally, we combine the inversion observation data with the latest drilling data from the Changli station to develop a new electrical structure model.
2016, 38(S2):197-202. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0197
Abstract:A variety of geomagnetic anomaly was appeared in the geomagnetic stations around epicenter before Menyuan MS6.4 earthquake. For example, There are abnormalies in the Z component LURR (load/unload response ratio)、the Z component daily variation ratio、the Z component 21 integral hour values spatial correlation and geomagnetic low-point time offset. Analyzing the geomagnetic anomalies before and after the earthquake is beneficial to accumulate experience and examples for prediction earthquake by geomagnetic method for the future.In this article, all geomagnetic anomalies observed before and after the earthquake are counted. During demonstrate the relationship between geomagnetic anomaly and the earthquake, spatial relation between geomagnetic stations and epicenter of the earthquake, time relation of anomalies and the earthquake was analyzed. Finally we summed up an example using geomagnetic analysis method in earthquake prediction.
NI Xiao-yin , FENG Zhi-sheng , CHEN Ying
2016, 38(S2):203-207. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0203
Abstract:On July 22, 2013, an earthquake occurred in Minxian County, Gansu Province, whose epicenter was located 154 km from the Tianshui seismic station. Geomagnetic three-component second sample observations at Tianshui station were initiated in 2007 through a GM4 fluxgate magnetometer. Here, we analyze the change of the geomagnetic polarization value and the transform function at Tianshui station from 2008 to 2014 based on the second data of GM4 fluxgate magnetometer. The results indicate that the geomagnetic polarization value and the transform function show different degrees of anomaly before the Minxian MS6.6 earthquake.(1) The transform function exhibited down turning recovery before the earthquake. In fact, the earthquake occurred just as the transform function reached the maximum.(2)The short-term increase was more obvious than the long-term trend, and the rising amplitude was larger.(3) Before the earthquake,the Parkinson vector azimuth in the periods of 20 s, 50 s, and 80 s was rotated and directed to the epicenter.(4) In April 2013, three months before the earthquake, the geomagnetic polarization at Tianshui station showed two anomalies of high values exceeding three times the mean square deviation.
ZHAN Na , GONG Yan-min , SONG Zhi-gang
2016, 38(S2):208-211. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0208
Abstract:Selected th Tangshan old seismic region in 1992-2014 flowinge gravity,drawing contour spatial variation of gravity field measurements and temporal variation curve,combining the Tangshan region 4 times 5.0 earthquake anomaly analysis. It is concluded that anomaly before the earthquake showed the following characteristics:(1)flowing gravity observation data are relatively obvious precursory anomaly response;(2)Earthquake occurred close to the contours of the gravity changes.
ZHANG Xuan , ZHANG Yuan-Sheng , TIAN Jie , ZHANG Qiao-Li
2016, 38(S2):212-217. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0212
Abstract:Aim at the thermal infrared anomaly in Gansu Jingta MS4.7 earthquake on March 21, 2016, this paper collected the infrared remote sensing brightness temperature data of China Geostationary Meteorological satellite FY-2E/G, and analyzed the data by using wavelet transform and relative power spectrum transform method. The results showed that the thermal infrared anomaly was distributed in the north area of epicenter, and the power spectrum enhanced 10 days before the earthquake. With the passage of time, the anomaly range gradually expanded northward until the occurring of the earthquake, which shank and weakened 14 days after the earthquake. The spatial distribution of thermal anomaly showed a strip intersection of north-south and North East direction, which is consistent with the previous statistics results. The thermal anomaly duration of this earthquake is only about 20 days, and its characteristic period is 21 days. By comparison with the similar case in this area, we found that the thermal infrared characteristics of this earthquake had some common points with that of Jingta MS5.4 earthquake on May 3, 2012, which mainly manifested in the following three aspects:(1) there was prominent thermal reaction before the two earthquakes; (2) the characteristic periods of the two earthquakes were both 21 days, but due to the impact of the earthquake magnitude, their thermal anomaly duration was slightly different; (3) the epicenters were both located near the fault which is at the edge of the anomaly concentrated area, or the intersection of the two thermal strips. The same characteristic periods can provide reference information for the induction of thermal infrared seismic precursor characteristics, and can also provide a reliable basis for the establishment of statistical model of regional thermal anomaly. The difference of the two cases mainly manifested in the maximum peak and anomaly range. These two earthquakes were from the same area, thereby reducing the effect caused by the different geological conditions, coupled with the similar occurrence time which reduced the interference caused by climate factors, so the different magnitude is the main reason for the difference of maximum peak and anomaly range.
PAN Yu-hang , YIN Zhi-wen , LIU Bai-yun , PU Ju
2016, 38(S2):218-221. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0218
Abstract:Seismic intensity rapid reporting and early warning, a complex system engineering, not only related to people's lives and property safety, but also to social harmony the country and the nation's security. Many seismic stations are added to the original network and old operation systems are upgraded about the earthquake early warning system and formed information network of seismic intensity rapid reporting, early warning and emergency earthquake observations to the public and government departments rapidly. This project enhance and improve seismic location parameters more curately and quickly, further promote service ability of protecting against and mitigating earthquake disaster in Gansu Province, and provide a scientific basis for the earthquake early warning.
2016, 38(S2):222-226. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0222
Abstract:After digital transformation, the regional seismic network of Jinchang city, Gansu Province, newly added four digital stations, expanded the scope of monitoring and improved the ability of monitoring. The original instrument and equipment have been updated and upgraded, continuous uninterrupted power supply system, data acquisition and transmission system performance have been greatly improved, observation environment has been effectively protected. Through the application of network technology, digital technology and new computer technology, we realized the data sharing, human-computer interaction analysis and positioning and save data disk medium, etc. software function, at the same time, the complexity of the network technology system also has a fundamental change. Through rediscussing the process of transformation and upgrading of the technical system of the digital seismic network of Jinchang area, combined with the network quickly and accurately to against south emperor city area in Gansu province in March 2008 a magnitude 5.0 earthquake and Qinghai Menyuan January 2016 magnitude 6.4 accurate positioning and earthquake quick report of an earthquake in the grid, providing a practical application of the data, in this article we will exchange the experience of the local area network transformation and explain its realistic significance of the transformation of the digital network.
ZHANG Chun-guang , ZHANG Li-fen , LI Jing-gang , WANG Qiu-liang
2016, 38(S2):227-230. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0227
Abstract:With the rapid development of reservoir construction, the risk of reservoir induced seismicity becomes higher. Statistics shows that there has more than one hundred reservoir induced earthquakes in the world, which can provide important materials for the study of reservoir induced seismicity. However, most materials are distributed in different places, which bring great trouble for the researchers. Therefore, the construction of the database system of basic information which is serviced for the risk prediction of reservoir dam project and the earthquake prevention and disaster relief of reservoir area is very necessary. Taking into account the system requirements, the database which includes attribute data and figure data is based on Microsoft Access platform. It realizes the function of data management, inquiry, statistics, output and so on, which provides the technical support for the research of reservoir induced seismicity.
ZHU Hong , WANG Xiao-lei , LIU Lei , YANG Zhao
2016, 38(S2):231-235. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0231
Abstract:The design of data monitoring and display system of Earthquake Administration of Tianjin Municipality use Java language and Mysql database. The system has measured seismic data, precursory data, environmental data, seismic events, earthquake station information query and display functions, standardizing all kinds of data format, changing data storage method, quering earthquake station basic information. Facilitate the scientific research personnel through the browser to the data retrieval and visualization display, to further improve the ability of data visualization display.
2016, 38(S2):236-239. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0236
Abstract:VOIP is the technology integration of voice in IP protocol,through the Internet to a transmission power of new communication style.The design of VOIP for earthquake emergency command vehicle of Jiangsu province, which is put forward in this article greatly strengthened the front and rear links and saving communication costs,which is important for improving our bureau earthquake emergency rescue comprehensive ability.
GAO Shu-de , ZHENG Wei-ping , AN Hai-jing , CHEN Yan-ping , MEI Dong-lin , GOU Ya-jiang , DU Chun-xin
2016, 38(S2):240-249. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0240
Abstract:Vacillation changes occurred synchronously in three channels of the deep-well geo-electrical resistivity observation at the Hanwang station in the Chinese city of Longnan on December 17, 2015, and continued until December 24. The cause of these changes could not be determined, so we verified the anomaly on site. After a field survey and a comparative analysis of the observation data, we found that the disturbances were not from changes in the electrical properties of the deep underground medium, but from shallow interference. This could have been a disturbance in the high-voltage power through the station, or an enhanced conduction of the wetting surface caused by watering the grass in the observation area of the station. By identifying this anomaly, a comprehensive understanding of deep-well geo-electrical resistivity observation was acquired, and experience of the verification procedure and analysis method of data mutation was accumulated.
JIA Peng , ZHANG Xi , LI Rui-sha , TANG Hong-tao
2016, 38(S2):250-255. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0250
Abstract:The Gauss-Function Model,based on least square collocation,is used in anomaly assisted identification of the regional cross-fault deformation characteristic curves. The precursory anomaly judgment examples of regional deformation of cross-fault leveling in Minxian MS6.6, Jingtai MS5.9 and other earthquakes show that least square collocation can be fitted in regional cross-fault leveling deformation and helped identifying anomaly characteristics. The method has certain significance for the cross-fault leveling deformation identification.
FENG Qiong-song , CUI Qing-qu , JIA Hua , LI Si-yao , LI Peng
2016, 38(S2):256-260. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0256
Abstract:According to analysise the precursor observation data of Kunming Station, we find that the interference of rianing and the abnormal of short-term precursor have similar characteristics.In order to obtain reliable information of precursor change, it is necessary to eliminate the interference of raining from the observed data, so that we can make an objective judgment on the abnormal changes.
ZHANG Yu , SHI Jiao-ping , CHEN Yao , XU Hui , QIN Yong-hong , YANG Xiao-peng , YANG Fei , MIAO Zai-peng
2016, 38(S2):261-265. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0261
Abstract:This paper analyzed the reason for the rise of water level in Pingliang Railway district. We calibrated the measurement system, lightning grounding resistance of power supply system, electric source voltage and on-site water level. We also investigated and compared the data of rain-fall and water level at the observation site, the water level data at other observation sites around the district, water temperatures of different depth in the well, the groundwater exploitation amount of Pingliang Huaneng power plant and the environment around the area. We have found that the rise of water level is caused by the decrease of groundwater exploitation of the 13 water wells owned by Huaneng power plant which is distributed over Pingliang area. It is unlikely to be the precursor of earthquake.
ZHANG Ying-jie , ZHAO Chang-hong , MA Guang-qing , WANG Xue-fei , WANG Bin
2016, 38(S2):266-269. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0266
Abstract:The Shexian seismic station borehole strain was broken by lightning in September 2013, Re drilled in 2014, drilling instrument variable be installed in January 2015, the same year in April officially running. Such problems have been encountered during the installation Borehole Strain of the Shexian seismic station:Broken rock collapse in the hole、The cable of Water level meter is too short to install and so on.In this paper, through the investigation of the surrounding environment of Shexian seismic station, discusses on the settlement of the Shexian seismic station of the new borehole strain the installation of the problems.Analysis of the data after the operation of the Borehole Strain.Indicates that the observation environment around Shexian station is good,fully meet the requirements of the standard,Stability and accuracy of Shexian seismic station borehole Strain data is higher, the same shock effect was significant. Show that the Shexian seismic station borehole strain running well and installed successfully, which can be a reference for other new stations.
LIU Shui-lian , HONG Xu-yu , ZHANG Qing-xiu , YANG Jin-ling , QUN Jian-jun , CHEN Mei-mei , LIN Hui-qin
2016, 38(S2):270-275. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0270
Abstract:According to the requirements of China Earthquake Administration anomaly verification,Through on-site verification analysis of the Xiao Tao seismic borehole body strain observation system and observation environment, Based on the anomalous variation of the observed data, Emphasis is put on the comparison of the data, Check out the cause of body strain change is non Earthquake abnormal, it's the release of pressure condition after the interference of precipitation.
WANG Xiao-juan , HAN Xiao-kun , CHEN Zhi , CUI Yue-ju , XIE Chao , LI Ying
2016, 38(S2):276-281. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0276
Abstract:In this paper, concentration characteristics of escaping radon and its relationship with tectonic activity from the Eastern Liupanshan Piedmont Fault Zone have been discussed. 8 measuring sections were laid in the Eastern Liupanshan Piedmont Fault Zon, radon concentration and flux of soil gas were measured in the field. The measurement results show that:The average value of the soil gas radon concentration is between 23.88 kBq to 66.34 kBq and the flux is between 2 194 Bqm-3s-1 to 14 091 Bqm-3s-1 in the 8 test areas. The mean value of soil gas Rn concentration in the fault zone in spatial distribution is gradually increased From north to south by 44.61 kBq increased to 66.34 kBq,but the average radon concentration decreased in Xixian Village and Liudian Village which located in the southern section of the fault zone. This may be caused by the difference in the activity of the faults in the space.
ZHAO Hui-qin , MA Dong , WANG Yan , WANG Hui-fang
2016, 38(S2):282-290. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0282
Abstract:This paper calculates and analyses the deformation observation data observed at Hebei province. The moderate and strong earthquakes in Hebei area are analyzed adopting the methods of Nakai fitting, amplitude factor, harmonic analysis and relative mean square deviation.The results show that the deformation data of vertical pendulum tilmeter、water tube tiltmeter and strain tide of Huailai、Yixian and Kuancheng in Hebei province have medium and short term reflecting earthquake ability for moderate strong earthquakes of the scope of Hebei.
HE Shen-hai , GONG Ping , WANG Qiu-liang , ZHEN Shui-ming
2016, 38(S2):291-295. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0291
Abstract:Statistical data of the basic data about Danjiangkou city's houses are obtained through documents collection and field investigation. On the basis of the data, we used probability analysis method of seismic vulnerability to make prediction of earthquake damage to buildings in Danjiangkou city. Prediction results show that Danjiangkou city has already reached basic requirements of seismic fortification VI degree, which means that the probability of a catastrophic failure is very small while suffers a VII degree earthquake, but moderate damage will likely occur widely, and lead to greater economic losses and casualties. The economic analysis of anti-seismic measures indicates that Danjiangkou city could achieve three levels of anti-seismic fortification target if about 6% of building investment was increased. Meanwhile, this paper puts forward some anti-seismic measures and advices for the government planning and management of earthquake prevention and disaster relief.
LIU Jun , SUN Jia-ning , SONG Li-jun , LI Zhi-qiang , TAN Ming , HAN Zhen-hui
2016, 38(S2):296-301. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0296
Abstract:This paper introduces the data space method of population and the housing, taking Yili area as an example to establish a consistent with km grid population and housing data model of non-uniform density distribution, and its space, finally the result was verified by the field survey data. Through data inspection, population density data, 1km grid housing density data reasonably reflect the demographic unit and the actual housing distribution, has higher precision, and provide reliable basis for earthquake emergency rescue and decision.
LV Guo-jun , ZHANG He , SUN Li-na
2016, 38(S2):302-307. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0302
Abstract:We conducted a field sampling survey of housing in the Zhangjiakou rural areas to record the main structure types, construction time, proportion, site conditions, and other information on the buildings in this area. The results were combined with the geological tectonic background of this area and the house damage caused by the 1998 Zhangbei earthquake, to investigate the problems in the seismic fortification of rural houses and to propose seismic countermeasures for rural housing construction. This study can provide technical support for improving the seismic performance of buildings in the Zhangjiakou rural areas, new rural construction rules, and guidelines for the reinforcement of dilapidated buildings.
MA Xiu-fang , ZHAO Jin-quan , XUE Xiao-dong , AN Wei-ping , ZENG Jin-yan
2016, 38(S2):308-313. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0308
Abstract:We carried out a detailed geological survey and mapping along the ground fissures distribution area in Shanxi Qingxu and rich databases were stored for the future study of the geological structure and ground fissure. According to the survey, the direct economic losses caused by the ground fissures were converted with the universal affected body economic loss calculation method.The results show that the main features of the ground fissure disaster in Qingxu are as follows:(1) horizontal feature; (2) dimensional damage;(3)limited destruction range; 4.gradual process. Construction ground fissures caused 1,973 houses seriously damaged 3,460 houses medium damaged, 4 050 houses minor damaged, and housing economic losses were about 1.168 65 billion in Qingxu. Approximately 1 090 acres of arable land lost irrigation functions and become dry land or wasted land, and arable land economic losses were about 2.18 million yuan. Ground fissures caused highway damage in three places and the road economic losses were about 8.7 million yuan.In general,Direct economic losses caused by the construction ground fissures were approximately 1.278 45 billion in Qingxu.
YANG Li-chen , LU Ning , FAN Guang-jie , GUO Peng
2016, 38(S2):314-318. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0314
Abstract:It's been almost six years since Yushu 7.1 earthquake in 2010, and the rebuilt Yushu takes on an entirely new look, especially in buildings. Compared the vulnerability of buildings before the earthquake and the vulnerability of reconstruction buildings after the earthquake, great changes have taken place. In this paper, the disaster caused by Yushu 7.1 earthquake is reviewed briefly first. Second, the information about the vulnerability of the reconstruction buildings was acquired by field investigation. Finally, an analogy method was employed to modify the Damage Probability Matrixes of buildings which are similar to them in construction technique and materials. The modified Damage Probability Matrixes can reflect the vulnerability of the rebuilt buildings.
YAO Yuan , CHANG Xiang-de , TAN Ming , CHEN Jian-bo , PEI Liang
2016, 38(S2):319-324. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0319
Abstract:An MS5.0 earthquake occurred on February 11, 2016 in Xinyuan Country, Xinjiang, at a focal depth of 9 km. The earthquake intensity was VI degrees. Based on a field survey and a related data analysis, we reached two conclusions. First, the seismogenic structure producing this earthquake was located at the south margin of the Awulale mountain fault. The fault strike of is EW, the tendency is north and the dip is 20°~70°. There is a mutual influence between this fault and the Kashi River fault, which caused the Xinyuan-Hejing M6.6 earthquake on June 30, 2012. Second, most disasters caused by this earthquake were due to the fact that many buildings were old and the civil structure was self-built, not following any earthquake-resistant design. Therefore, after the earthquake, some buildings were unsafe.
CHE Gao-feng , LIU Hong-mei , CHAI Shao-feng , ZHONG Xiu-mei
2016, 38(S2):325-328. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0325
Abstract:In this paper, Gansu provincial committee and government unified arrangements Minxian-Zhangxian MS6.6 Earthquake recovery and reconstruction work as an opportunity, by collecting field data and reconnaissance site conditions, it can grasp the site characterization of relocated concentrated settlements. After the field investigation, the author digged loess samples from the slope, tested the static test in the laboratory, got the relevant parameters from the soil physical and mechanical properties, used these parameter as the basic parameter for numerical modeling, used Minxian seismic wave to simulate the dynamic mechanical properties of the slope under earthquake action, the safety factor of the slope was obtained at last.On the basis of the calculation of the safety factor, combined with the "Specification of Geological Investigation for Lanslide Stabilization" and "Code for seismic design of buildings", the paper will give the site's landslide risk assessment, the slope is under steady state under static conditions, there is a possibility of further landslides, it is in an unstable state under dynamic conditions, especially in the case of strong earthquakes, it is likely to cause landslides further collapse, And for the actual site security issues that have arisen, it will also present a comprehensive damage prevention countermeasures. Considering the proposed avoidance, another safe and reliable site for placement, in order to avoid greater losses.
ZHAO Ying-ping , YANG Rui , GAO Jing-chu , WANG Ning , JIA Jiong , LI Xue-ying , CAI Ling-ling , WANG Li-chan
2016, 38(S2):329-338. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0329
Abstract:In the paper, 4180 horizontal-component digital seismograms of 169 earthquakes recorded on 162 stations of Hebei Digital Tele-seismic Network during Jan. 2009 to May 2015 are used in the researches for the entire Hebei region and adjacent domain, the study area is divided into two areas:the mountain area and the plain area according to the terrain and geological structure, the inelastic attenuations of the two areas are studied. Following a hinged tri-linear geometrical spreading model,the Q values are calculated for each area by Atkinson's method and compared with the exited data. The frequency-dependent Q in the mountain and flat area are estimated as Q(f)=474.8f0.3589 and Q(f)=294.5f0.5193.Then, the source parameters and the site responses are inverted by the Moya's method, the site responses of 93 bedrock stations and 58 underground stations are obtained. The site responses with frequency for bedrock stations are more complicated, most of the site responses of different types of bedrock stations have no obvious consistency. The site responses of the underground stations are basically consistent with the change of frequency, and the performance of the low frequency band (1~7 Hz) is enlarged, and the high frequency band (7~20 Hz) is the attenuation effect.
MENG Lin-peng , PENG Yuan-qian , YANG Qi-yan , RAN Zhi-jie
2016, 38(S2):339-343. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0339
Abstract:In this paper, we carried out water area seismic imaging detection, in order to find out whether there is water hidden fault near Qinhuangdao tourism artificial island, The results show that one fault is located in the northeast side of the Qinhuangdao tourism artificial island and Another fault is located in the south of it, with steep dip angle of fault, breakpoint buried shallow, about 3m from the seabed. Combined with regional tectonic earthquake and city of Hebei Province, seismic active fault detection and seismic risk evaluation of project results, and comparative analysis, that the two faults are the bedrock fracture, does not have the dangerous conditions and earthquake occurrence.
LI Jing-gang , YAO Yun-sheng , ZHANG Li-fen
2016, 38(S2):344-350. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0344
Abstract:Borehole profile is important basic data in seismic safety evaluation. Drawing synthesis column map is an important work in seismic and geologic job. With the wider and wider application of computers in geology, geological workers made various attempts to draw drilling geological column map efficiently such as using some commercial software or drawing based on commercial software for secondary development software, but efficiency is not acceptable enough, and the pertinence is not strong for Seismic work. This article present an independent seismic borehole log and composite section drawing software based on the.net platform using C# language. The key steps and main function modules of the software are introduced. The software can easily read the original data of actual observation to draw geological column map, generate high-resolution vector graphics, generate parameter files, which can be easily used to construct the three-dimensional geological model of underground and drilling data visualization analysis and scientific management.
WANG Ning , YANG Chun-li , ZHAO Ying-ping , WANG Li-chan
2016, 38(S2):351-355,361. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0351
Abstract:More and more buildings have been built in kars tareas in recent years and the constructions have encountered many difficulties of the karst. Identify karst distribution becomes important. A project site in Guangdong province found a large cave in the feasibility study stage, which affected the foundation construction seriously.This papers formation mechanism and distribution of the karst is analyzed from engineering geology,hydrogeology and many more. Based on geophysical,prospecting and borehole data,This papers find distribution of karst on a project site,and make a evaluation from stability site and construction suitability accurately and reasonablely, the results will provide scientific basis for disaster prevention in engineering construction of karst areas.
GAO Xiao-qing , YANG Li-wei , GUO Wei-dong , GUO An-ning , GUO Zeng-jian , TANG Mao-cang
2016, 38(S2):356-361. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0356
Abstract:At present,it is still known less about the large-scale motion characteristics of fluid in the Earth's crust. The motion characteristics of fluid in the Earth's crust are close related to the geo-dynamics,earthquake,earth's degassing and climate change etc. In this paper,by using the multi-year observation data of soil temperature for different layers at 239 meteorological stations in China,we calculate the annual averaged heat flux over the interface between land and atmosphere with 3 methods and find that it has an opposite annual variation with latitude. a net heat absorption in the south area of 300N and a net heat emission in the north with a flux of 2 wm-2,which demonstrates the heat flows transfer from low to high latitude in the lithosphere with causing an underground circulation as that in the atmosphere. Assuming that the porosity in the surface of lithosphere (z=0) is 10-1 and 10-5 in the bottom,10~30 cm/s speed is needed for underground fluid(gases in earth) to supply a meridional heat transfer. The statistic for the monthly moving rate of the geothermal vortex in the period of 2003 to 2007 is made in China. The results show that the 300~600 km rate of one month is the most common,the seismic vortex with MS≥7.0 can move backwards and the one with MS=6.9 can be taken as a "static vortex" with a 350 km distance of farthest precursor that is recognized as a semi-wave-length of the seismic vortex. Therefore,we can evaluate a mean speed of 20 cm/s for the underground gases with Rossby formula. So we can conclude that the underground circulation is also a three-cell circulation.
GUO An-ning , PENG Li-shun , ZHANG Xiang-hong
2016, 38(S2):362-363. DOI: 10.3969/j.issn.1000-0844.2016.Supp.2.0362
Abstract:Discussed the relationship between Moho surface fluctuation and large earthquake, and the correlation between them is not good.The main reason is related to the coefficient described by Byerlee friction law. That is, in deep conditions, the friction coefficient has nothing to do with the physical properties.
Sopyright:China Earthquake Engineering Journal