[1]LIU Zifeng,SUN Nan,WANG Guangming,et al.Retrospective Analysis of Seismometric Anomalies before the 2021 Yangbi,Yunnan MS6.4 Earthquake[J].Journal of Seismological Research,2021,44(03):348-356.
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Retrospective Analysis of Seismometric Anomalies before the 2021 Yangbi,Yunnan MS6.4 Earthquake
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
44
Number of periods:
2021 03
Page number:
348-356
Column:
Public date:
2021-10-20
- Title:
- Retrospective Analysis of Seismometric Anomalies before the 2021 Yangbi,Yunnan MS6.4 Earthquake
- Keywords:
- seismometric anomalies; focal mechanism consistency; seismic belt; intensified earthquake activities; foreshock sequence; the Yangbi MS6.4 earthquake
- CLC:
- P315.72
- DOI:
- -
- Abstract:
- In order to improve the seismometric prediction index system in Yunnan,we review the seismometric anomalies which we had tracked and analyzed before the 2021 Yangbi MS6.4 earthquake,including earthquake quiescence,intensified earthquake activity,earthquake strips,seismic parameters,and the characteristics of the foreshocks' activity.Then we draw the following conclusions:①the seismometric anomalies before the Yangbi earthquake contained mainly the quiescence of earthquakes in different periods and spaces and of different magnitudes.The earthquake strips intersected significantly.A cluster of 5-magnitude earthquakes occurred in northwestern Yunnan from 2012 to 2017,and the activity of 4-magnitude earthquakes intensified in the sub-region of western Yunnan and its neighboring regions since 2020.The anomaly of the activity of foreshocks mainly featured as in medium-and long-term.The small-and medium-foreshocks intensively occurred in the source area of the Yangbi earthquake.②Our judgment on the seismic tendency in middle-and long-term and in large area in West Yunnan based on the seismometric anomalies we put forward before the Yangbi earthquake is correct.However,as we depend much on the experience of the past earthquake cases,our identification of the impending foreshocks before the Yangbi earthquake has some disadvantages.
- References:
- -
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Last Update:
2021-10-20