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Aftershock sequence relocation of the 2021 M_(S)7.4 Maduo Earthquake, Qinghai, China

Science China Earth Sciences 2021年第8期64卷 1371-1380页

作者： Weilai WANG Lihua FANG Jianping WU Hongwei TU Liyi CHEN Guijuan LAI Long ZHANG Institute of Geophysics China Earthquake AdministrationBeijing 100081China Key Laboratory of Earthquake Source Physics China Earthquake AdministrationBeijing 100081China Qinghai Earthquake Agency Xining 810001China

The 2021 Qinghai Maduo M_(S)7.4 earthquake was one of the strongest earthquakes that occurred in the Bayan Har block of the Tibetan Plateau during the past 30 years,which spatially filled in the gap of strong earthquake in the eastern section of the northern block *** this study,the aftershock sequence within 8 days after the mainshock was relocated by double difference *** results show that the total length of the aftershock zone is approximately 170 km;the mainshock epicenter is located in the center of the aftershock zone,indicating a bilateral *** aftershocks are mainly distributed along NWW direction with an overall strike of 285°.The focal depth profiles indicate that the seismogenic fault is nearly vertical and dips to southwest or northeast in different sections,indicating a complex *** is an aftershock gap located to the southeast of the mainshock epicenter with a scale of approximately 20 *** the eastern end of the aftershock zone,horsetaillike branch faults show the terminal effect of a large strike-slip *** is a NW-trending aftershock zone on the north side of the western section,which may be a branch fault triggered by the *** location of the aftershock sequence is close to the eastern section of the Kunlun Mountain Pass-Jiangcuo(KMPJ)*** sequence overlaps well with surface trace of the KMPJ *** speculate that the KMPJ fault is the main seismogenic fault of the M_(S)7.4 Maduo earthquake.

关键词： Maduo earthquake Aftershock sequence double-difference location Kunlun Mountain Pass-Jiangcuo fault

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Seismic analysis of the Xiluodu reservoir area and insights into the geometry of seismogenic faults

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Earthquake Science 2022年第5期35卷 371-386页

作者： Hongfu Lei Qincai Wang Cuiping Zhao Ce Zhao Jinchuan Zhang Jun Li China Three Gorges Construction Engineering(Group)Co. Ltd.Chengdu 610000China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China Jiangsu Earthquake Agency Nanjing 210014China The Second Monitoring and Application Center China Earthquake AdministrationXi’an 710054China

The Xiluodu(XLD)reservoir is the second largest reservoir in China and the largest in the Jinsha River *** occurrence of two M>5 earthquakes after reservoir impoundment has aroused great interest among seismologists and plant *** comprehensively analyzed the seismicity of the XLD reservoir area using precise earthquake relocation results and focal mechanism solutions and found that the seismicity of this area was weak before *** impoundment,earthquake activity increased *** occurrence of M≥3.5 earthquakes within five years of impoundment also appear to be closely related to rapid rises and falls in water level,though this correlation weakened after five years because earthquake activity was far from the reservoir *** in the XLD reservoir area are clustered;near the dam(Area A),small faults are intermittently distributed along the river,while Area B is composed of multiple NW-trending left-lateral strikeslip faults and a thrust fault and Area C is composed of a NW-trending left-lateral strike-slip main fault and a nearly EWtrending right-lateral strike-slip minor *** geometries of the deep and the shallow parts of the NW-trending fault *** the action of the NW-trending background stress field,a series of NW-trending left-lateral strike-slip faults and NE-trending thrust faults in critical stress states were dislocated due to the stress caused by reservoir *** two largest earthquakes in the XLD reservoir area were tectonic earthquakes that were directly triggered by impoundment.

关键词： Xiluodu reservoir area double-difference location focal mechanism solution fault geometry reservoir impoundment

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