地球与行星物理论评（中英文）2024，Vol.55Issue(4)：461-468,8.DOI:10.19975/j.dqyxx.2023-053
深部地质洞穴塌缩的地震学证据
Seismological evidence for collapse of a deep geological cave
摘要
Abstract
Do large caves exist deep underground?Through seismological investigations,we speculate the exis-tence of a large geological cave about 7 km beneath the surface.The complete moment tensor inversion method(gCAP)was used to analyze the ML4.7 earthquake that occurred in Rongchang District,Chongqing,on December 27,2016.The complete moment tensor solution of its focal mechanism was obtained,and the waveform fitting was good.The inversion results showed that this relatively special earthquake had a thrust and collapse type source and that the earthquake centroid depth was 7 km.Based on the focal mechanism results and the fact that the earthquake was located near an anticlinal fold,we infer that this earthquake was attributable to thrusting of a fault in the anti-clinal fold,which simultaneously led to destruction of the stability of the geological cavity in the fold,leading to collapse.The focal mechanism results showed that the seismic moment tensor had mainly a horizontal component with less vertical component,which is consistent with the local tectonic stress.The results indicate that the com-plete moment tensor of the focal mechanism inversion method is an effective means for studying complex earth-quakes.In addition,shale gas drilling in this area is very deep and there are hydraulic fracturing operations,sug-gesting that earthquakes may be induced by the water injection pressure.关键词
荣昌地震/震源机制解/空洞塌缩Key words
Rongchang earthquake/focal mechanism/collapsing of cave分类
地球科学引用本文复制引用
薛霆虓,王亮..深部地质洞穴塌缩的地震学证据[J].地球与行星物理论评（中英文）,2024,55(4):461-468,8.基金项目
安徽建筑大学自然科学基金资助项目(2019QDZ17) （2019QDZ17）
贺州学院博士科研启动基金项目(2023BSQD01)Supported by the Natural Science Fund of Anhui Jianzhu University(Grant No.2019QDZ17),and the Doctoral Research Initiation Fund of Hezhou University(Grant No.2023BSQD01) （2023BSQD01）
