Crustal thickness in southeast Tibet based on the SWChinaCVM-1.0 model

Extensive geophysical research has been carried out in southeast Tibet due to the complex geological structure and high seismicity.The study of the Moho interface can provide useful information for the geophysical research.SWChinaCVM-1.0 is the first version of a regional community velocity model for the Sichuan-Yunnan region and aims to provide a reference for seismological research in the region.Based on this model,a high-precision community Moho interface model can be obtained using common conversion point(CCP)stacking,to further expand the applicability of SWChinaCVM-1.0.Before CCP stacking,it is necessary to check the fit of the practical and theoretical travel times of the Ps phase and its multiples under the constraints of the model.Using this method,referred to as Hκ0 stacking,we determined the Moho interface.However,the multiples were poorly fitted with the theoretical travel times at many stations,and the crustal thickness obtained was inconsistent with previous findings.Therefore,we speculate that the SWChinaCVM-1.0 model has some limitations that render it incompatible with the CCP stacking method.To further verify this hypothesis,we performed H-κstacking using the v_(P)-v_(S)model,v_(P)model,v_(S)model,and the regional average velocity v_(P0)and compared the results with those of H_(κ0)stacking.The results of the comparison indicate that the SWChinaCVM-1.0 model requires improvements.In addition,by analyzing the SWChinaCVM-1.0 inversion process,we found that the v_(S)model was more reliable than the v_(P)model.Finally,we adopted the crustal thickness obtained using H-κstacking based on the v_(S)model as the initial version of a community Moho interface model for the Sichuan-Yunnan region(SWChinaCVM-MOHO-1.0).

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

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 boundary.In this study,the aftershock sequence within 8 days after the mainshock was relocated by double difference algorithm.The 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 rupture.The 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 geometry.There is an aftershock gap located to the southeast of the mainshock epicenter with a scale of approximately 20 km.At the eastern end of the aftershock zone,horsetaillike branch faults show the terminal effect of a large strike-slip fault.There is a NW-trending aftershock zone on the north side of the western section,which may be a branch fault triggered by the mainshock.The location of the aftershock sequence is close to the eastern section of the Kunlun Mountain Pass-Jiangcuo(KMPJ)fault.The sequence overlaps well with surface trace of the KMPJ fault.We speculate that the KMPJ fault is the main seismogenic fault of the M_(S)7.4 Maduo earthquake.

违法所得没收程序之检视

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