Abstract:Land subsidence is one of typical geological disasters at present. From 1990＇s, the land subsidence induced by engineering environmental effect has become a new cause in Shanghai city. The replicating effect of land subsidence induced by the dense high-rise building group and the effect of building high-rise buildings on the environment near the site are preliminarily researched in this paper, which can offer reference to control the land subsidence induced by the dense high- rise building group.

Abstract:The risk mamagement research has became a hot subject in the domain of disaster prevention and mitigation as the works changed from ＂passively relieve disaster＂ to ＂active prevention＂ in recent years. In this paper, the research grogress of the earthquake disaster risk assessment is reviewed, and the shortcomings of some precent methods are pointed out also. Then, the method of urban earthquake hazard assessment based on the earthquake microzonation, the method of seismic vulnerability assessment based on urban landuse types, and the method of disaster prevention and mitigation capacity assessment based on expert scoring are presented. At last, the flow of the urban earthquake disaster risk assessment is designed, and its arithmetic is given.

Abstract:The phase-matched filters are defined as a group of linear filters in which the Fourier phase of the filter is made equal to that of a given signal. In this article, the fundamental theory of phase-matched filters is described in detail, and on the basis of the given path dispersion curve the design of phase-matched filter is finished in theory. Finally, an effective method working on weak surface wave signals is developed. To test the validity of the method, it is applied to a set of nuclear explosions occurred on the Nevada Test Site and the magnitudes of these events are estimated. From comparing the Ms obtained from the method with ones reported by ISC（International Seismological Centre）, it is proved that the relative error is small, the design is effective to detect surface wave signal, and the signal-to-noise rate of weak surface wave signals can be enhanced .

Abstract:The parallel-plate assembly is a new type fuel element in nuclear reactors. According to the natural vibration characteristics of the parallel-plate assembly, its fluid-structure interaction vibration with nonlinear support is theoretically analyzed and numerical computed. The stability of steady-state solution near the quilibriu points is analyzed using the theory of stability. The result offers reference to the design and the safe analyse of the the parallel-plate assembly.

Abstract:During Nov. 3-14, 2001, a earthquake swarm with M1. 5-3. 7 occurred between Changshu city and Zhangjiagang city, in Jiangsu province. Based on the digital data recorded by the telemetered seismic network of Jiangsu province, using the Seismic Doublet Coherence Function Method（DCFM）, this swarm is relatively relocated in this paper. The main event of the swarm is relocated by local crust model travel time table. The results demonstrate： （1） The main event is separated 10. 61 km from the original one; （2） The swarm＇s epicenters are more close each other than the original distribution. （3） The focus depths are 16.5-17.5 km, which can not be determined in original way. The relationship between relocated swarm and tectonics is discussed also.

Abstract:Dongqiulitag fault is one of the most active tectonics in Kuqa depression. The piedmont alluvial-pluvial fans and terraces of Bositantuoke-lake trivet are dislocated by the fault in different degrees. Through the field work, the biggest displacement along the fault on the terraces are measured with total station and differential GPS （Ashtech Promark2）, and the age of the terraces are estimated.. According to the fact that vertical displacements of the fault on the terrace Ⅰ-Ⅲ are 12.5 m, 20 m and 24.5 m, the average vertical slip rate of Dongqiulitage fault since late Quaternary is about 1 mm/a, and the relative average shortening rate is 1.97-2.13 mm/a.

Abstract:Two models for sand liquefaction prediction are established according to the nonlinear classification of least square support vector machine（LSSVM）. The prediction results from LSSVM are in keeing with the actual situation in field. It shows that the models for sand liquefaction prediction based on the LSSVM is feasible,and has high accuracy .

Abstract:Using the thermal infrared satellite remote sensing data on the region of Pakistan Ms 7.8 earthquake on Oct. 8, 2005, in 2004-2005, from Noaa17/AVHRR, the surface temperature of 7°×7° range is inversed, and the deciphering images of thermal infrared are compared with the local tectonics. The temperature-time sequence of the epicenter area aurface shows that there had been obvious thermal infrared anomaly in the area in 3 months before the earthquake occurred.

Abstract:Taking the 20 kN dynamic triaxial apparatus made by Tianshui Hongshan Testing Machine Ltd. as an example, the main interference factors in the control system of this machine are analyzed, and some anti-interference measures from both hardware and software are adopted. The work can provide a method for anti-interference of control system in similar testing equipment.

Abstract:Using the system cluster of focus mechanism solutions for moderate-strong earthquakes and the stress field inversion of focal region in the Jiashi strong earthquake swarm from 1997 to 1998, main result as followed are obtained：（1） The Jiashi strong earthquake swarm is characterized mainly by strike-slip and normal fault. The axis of principle compressive stress is oriented mainly to NNE or nearly NS, which is inconsistent with the regional tectonic stress field of the adjacent Kalpin block. The rupture plane of the Jiashi strong earthquake swarm is oriented NEE, belong to left-lateral rupture. （2） From the stress field inversion of moderate-strong earthquakes with M4-5, we obtains that the maximum compressive stress axis is NNE, the minimum one is NWW, the＇dip angle of medium stress axis is 65°, which is upright. （3） The stress field in the focal region had a change process before and after those strong earthquakes. Finally, certain discussion to the result is given.

Abstract:In the paper, the characteristics of seismological precursors （seismic spatial correlation length and coda Qc） associated with the earthquake （M=5.5） occurred in Minxian, Gansu Province, on Nov. 13, 2003, are studied. The result shows an increasing trend of the both parameters before the earthquake. And a power exponent relation is used to fit the increasing variation form of the parameters. The study provids a basis for creating a method and finding indexes to predict earthquake occurrence time by using the monitored seismic spatial correlation length and coda Qc.

Abstract:In this paper the marks for distinguishing the active fault relating to earthquakes in geophysical data, such as gravity and geomagnetic fields, magnetotelluric exploration and seismic prospecting, are introduced. Taking the Wushi seismic belt as the example, the method of synthesizing those geophysical exploration data for active fault research is analyzed. The result shows that choosing different data group according to different research purpose could get information of the seismic belt such as fault distribution, deep structure and active features.

Abstract:The mathematics principle of Inhomogeneous Degree（ID） of precursor group anomaly,a new method for extracting precursor group anomaly,is expounded. Taking the group anomaly of mercury content in groundwater in Yunnan province as an example, the method is practical calculated. The result shows that ID of precursor group anomaly can identify and alarm automatically in short-term earthquake prediction with taking the break of distributive features of precursory group anomaly as the anomalous criteria（ID≥1）. The method overcomes personal experiential limitation and can be examined easily by other people. It could provide a new prediction index with high corresponding probability for grouped strong earthquake prediction in Yunnan region.

Abstract:Taking the international information security standard BS7799/ISO17799 as criterion of the information security management system, according to the related stipulations from China Earthquake Administration, through analyzing the level relationship of information network and based on the scientific security frame, a Earthquake Information Service System for the network security management is established, which mainly includes the fire wall system, the VPN application system, the anti-virus software for network and IDS.

Abstract:The basic observation conditions of both digital and anologue groundwater level observation in Tangshan mine well is introduced, and the ability for recording seismic wave from 11 global earthquakes（Ms≥7） from July to December in 2004 for two kinds of observation is analyzed. The result shows that the digital data have some advantages： the character recognition is easier, the initial motion is clear, the data are continuous, and the interference is small. But it is still has some shortages such as the sampling rate is lower, and the water level vibration is easier to be distorted.

Abstract:The relativity analysis between water level and barometric pressure in Dadianzi well, Chifeng city, Inner Mongolia, is done, and the Barometric pressure coefficient background value of this well is obtained. Meanwhile the varieties of the well＇s Barometric pressure coefficient before some moderate-strong earthquakes in the east of Inner Mongolia are analyzed, and the result shows that high value ＆ low value variation of the coefficient reflects possibly characteristic of earthquake precursor.

Abstract:In this paper, the observation data of groundwater levels in well/spring and water radon with continuous and stable observation in Shanxi province and its adjacent regions are collected. The special method for extracting intermediate-term and intermediate-short-term anomalies was chosen and used to analyse the anomalies of groundwater, level and water radon before Datong M6.1 and Zhangbei M6.2 earthquakes. Based on the statistical data, the index and method for intermediate-term and intermediate-short-term strong earthquake forecast judging by the precursor anomalies in underground liquid in this area are suggested.

Abstract:Using the method of limited time, the h＇ values for 12 strong aftershocks ML≥4. 7 occurred in Heyuan city and Yangjiang city of Guangdong province are calculated and analyzed. The results show that the method has good capability of short-term earthquake prediction for strong aftershocks, it provides a available way for the earthquake prediction in this two areas.

Abstract:Through analysis on the radon contents in Tainei well in Zhangzhou city, Fujian province, since 2005, the medium and short-term anomalies are collected, it is considered that the anomalies are relative with Ms7. 2 earthquake in outer sea of Pingdong Taiwan province, on December 26, 2006.

Abstract:VBA is a programming language software integrated into Microsoft WORD instruction in WORD2003, its compiling procedure could produce Microsoft WORD document directly. In this paper, combined with the works of ＂three working system construction＂ for protecting against and mitigating earthquake disasters through analyzing the style and characteristics of the relative laws, the regulations documents, enforcing law documents, and different kinds of tables issued by CEA or Earthquake Administration of Gansu Province, the system is analyzed and designed. Based on this the Office-automation System for conducting issue of protecting against and mitigating earthquake disasters is exploited by using Visual Basic inlaying into VBA instruction.

Abstract:Based on the analysis of corresponding relationship between the abnormal variation of underground water level of Yanguan well in Lixian County, Gansu province, in more than 20 years and moderate-strong earthquakes occured in the near area, this paper especially focus on the corresponding relationship between two main negative anomalies in the water level during 18 years and two earthquakes more than 1 000 km far in Yuannan province （Luquan M6. 1 earthquake in 1985, Dayao M6.2 earthquake in 2003）. It is considered that the Yanguan well is most possible sensitive spot for strong earthquake in north area of Yunnan province.

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