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鄂尔多斯地块周缘应力状态与强震危险性分析
梁向军1,2, 王霞1,2, 宋美琴1,2, 陈慧1,2
1.山西省地震局, 太原 030021;2.太原大陆裂谷动力学国家野外科学观测研究站, 太原 030025
摘要:
针对鄂尔多斯周缘断陷盆地带,基于b值、Δb空间扫描和多参数(b、√Ena/b)组合计算结果,综合分析各段落的应力状态,进而判定它们的危险性。结果显示:整个周缘断陷带的年发生率、年释放率均整体下降,揭示出该区域2010年6月以来呈现出地震弱活动状态;b值较1970~2010年结果变化并不显著,内蒙古磴口-五原值得注意地区、同心-灵武值得注意地区、晋冀蒙交界危险区和侯马-运城值得注意地区4个区域仍处于匀速的应力积累状态;结合多参数组合揭示的应力状态和断裂习性,认为内蒙磴口-五原地区未来发震危险性最高,但近期发震的紧迫性不强,同心-灵武地区危险性有所增强,侯马-运城地区危险性持续,晋冀蒙交界地区危险性有所降低,其余段落近期复发强震的可能性不大。
关键词:  鄂尔多斯周缘  b  Δb  多参数  强震危险性
DOI:
分类号:P315
基金项目:中国地震局地震预测研究所科研专项(2017IES010104、2017IES010105)、国家重点研发计划项目(2017YFC1500502-01)、山西省科技厅项目(201801D221044)和2019年度震情跟踪专项工作任务(2019010106)共同资助
Stress State and Strong-earthquake Risk around the Ordos Block
Liang Xiangjun1,2, Wang Xia1,2, Song Meiqin1,2, Chen Hui1,2
1.Shanxi Earthquake Agency, Taiyuan 030021, China;2.National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan Seismic Station, Taiyuan 030025, China
Abstract:
Based on the calculation results of b-value,Δb spatially scanning and multiple-seismicity-parameter-value combinations(b, √E, n,a/b),we comprehensively analyze the stress state of basins around the Ordos block and then determine their risks. The results show that annually seismicity rate and annually strain-release-rate generally decrease in the fault depression belt around the Ordos block,revealing the weak seismicity of this region since June,2010. The difference of b-value between 1970~2018 and 1970~2010 is not obvious. The areas that are worthy of attention,including Dengkou-Wuyuan in Inner Mongolia,Tongxin-Lingwu,the junction zone of Shanxi-Hebei-Inner Mongolia and Houma-Yuncheng,remain constant stress accumulation state. Combined with the stress state reflected by multiple-seismicity-parameter-value combinations and fault habit,the probability of strong-earthquake is the highest in Dengkou-Wuyuan, Inner Mongolia,but the urgency of that in the near future is not strong. The risk of Tongxin-Lingwu area enhances a little. The risk of the Houma-Yuncheng area still continues. The risk of junction zone of Shanxi-Hebei-Inner Mongolia decreases a little. The probability of strong-earthquake on other sections is small in the near future.
Key words:  Around the Ordos block  b-value  Δb  Multiple-seismicity-parameter  The risk of strong-earthquake