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[1]LI Danning,ZHANG Guoquan,MIAO Suqiu,et al.Analysis of Early Warning Processing Results from the 2021 Yangbi,Yunnan MS6.4 Earthquake[J].Journal of Seismological Research,2021,44(03):399-406.

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Analysis of Early Warning Processing Results from the 2021 Yangbi,Yunnan M_S6.4 Earthquake

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 44 Number of periods: 2021 03 Page number: 399-406 Column: Public date: 2021-10-20

Title:: Analysis of Early Warning Processing Results from the 2021 Yangbi,Yunnan M_S6.4 Earthquake

Author(s):: LI Danning; ZHANG Guoquan; MIAO Suqiu; GAO Yang; QIN Min; MA Honghu; CUI Qinggu; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: earthquake early warning; stations type; magnitude error; the Yangbi M_S6.4 earthquake

CLC:: P315.6

DOI:: -

Abstract:: On May 21,2021,the Yunnan Earthquake Early Warning Processing System effectively processed the Yangbi M_S6.4 earthquake and produced kinds of early warning information.This paper analyzed the relationship between the arrival time and the epicentral distance.It is found that for the Yangbi earthquake,the Early Warning System picked up seismic phases without mistake,ensuring high accuracy of the epicenter location and the origin time.The magnitude given by the system is generally underestimated.We compared the magnitude error of different types of stations,and found that the stations deployed with seismic-intensity meters have the smallest error,followed by the old seismometer stations and the newly-built seismometer stations.The accelerometer stations have the largest error.The Early Warning Processing System was connected to the newly-built seismometer stations and the accelerometer stations in May 2021,which in favor of improving the accuracy and stability of early warning results like the epicenter location and the original time of the Yangbi earthquake given by the system.But the magnitude error has not changed significantly,and the magnitude is still generally underestimated.This proves that the stations’ layout of the Yunnan Earthquake Early Warning Processing System is reasonable; the epicenter and the origin time produced by the system are of high accuracy.The system has a certain early warning capability,but its magnitude algorithm needs to be improved.

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Last Update: 2021-10-20