西秦岭北缘断裂带土壤气定点监测与初步结果分析
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国家自然科学基金重点项目(U2039206);中国地震局地震科技星火计划(XH18047);甘肃省地震局创新团队专项(2019TD-02-03)


Preliminary analysis results of fixed-point monitoring on soilgas along the northern margin fault of West Qinling
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    摘要:

    根据前人对西秦岭北缘断裂带上历史地震及古地震复发周期和离逝时间等的综合研究,得出该断裂存在发生强震的较大潜在风险,因此加强对该断裂现今构造活动的定点监测和地震预测预报具有重要现实意义。据此,根据断裂逸出气体测项剖面浓度分布(变化)特征,在西秦岭北缘断裂带(天水段)上新建3个断层土壤气连续观测站,开展断层气(H2、CO2、Rn、CH4)浓度观测,分析断裂带不同段深部气体特征的空间差异及其随时间的变化特征,监测甘东南地区应力调整与地震活动。初步观测资料分析表明:在正常情况下其背景值比较稳定,且同一测项在不同测点变化形态具有相似性、同步性,说明观测资料真实可靠,并具有可比性。各测点出现测项同步异常变化时,可能反映了区域应力调整及变化状态,对震情跟踪和地震预测提供参考判据。

    Abstract:

    According to the previous study on the historical earthquakes and the recurrence cycle and elapsed time of paleoearthquakes along the northern margin fault zone of West Qinling, a great potential risk of strong earthquakes exists in the fault. Therefore, it is of great practical significance to strengthen the fixed-point monitoring and earthquake prediction of current tectonic activity of the fault. In this paper, according to the profile concentration distribution (variation) characteristics of gas escaping from the fault, three stations for continuous observation on fault soil gas were newly built in the Tianshui section. Then the concentration observation of fault gas (H2, CO2, Rn, CH4) was carried out to analyze the spatial difference of deep gas characteristics in different sections of the fault zone and their variation characteristics with time. In this way, the stress adjustment and seismicity in southeast Gansu were monitored. The analysis of preliminary observation data showed that the background value is relatively stable under normal conditions, and the change patterns of the same measurement item at different measurement points are similar and synchronous, indicating that the observation data are true, reliable and comparable. The synchronous abnormal change of measured item at different measuring point may reflect the regional stress adjustment and change, thus providing a reference criterion for earthquake tracking and prediction.

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高曙德,赵洁,王爱国,张向红,曹玲玲,张昱,武善艺,苏小忠,杨超.西秦岭北缘断裂带土壤气定点监测与初步结果分析[J].地震工程学报,2021,43(5):1001-1007. GAO Shuode, ZHAO Jie, WANG Aiguo, ZHANG Xianghong, CAO Lingling, ZHANG Yu, WU Shanyi, SU Xiaozhong, YANG Chao. Preliminary analysis results of fixed-point monitoring on soilgas along the northern margin fault of West Qinling[J]. China Earthquake Engineering Journal,2021,43(5):1001-1007.

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  • 收稿日期:2021-05-19
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  • 在线发布日期: 2021-10-09