2021年12月19日青海茫崖Ms5.3地震特征研究

STUDY ON THE CHARACTERISTICS OF THE QINGHAI MANGYA Ms5.3 EARTHQUAKE ON DECEMBER 19,2021

以2021年12月19日青海茫崖Ms5.3地震为研究对象,分析了该地震的构造背景、地震序列、震源机制解和视应力特征。结果表明,本次地震的发震构造推测为柴达木盆地北缘断裂带西侧的一条北北西向隐伏断裂带,地震序列类型为主震—余震型,震源机制解为逆冲兼走滑型,视应力位于青海地区M_(L)≥3.0视应力均值线附近,序列视应力变化稳定。该结果有利于我们认识和了解本次茫崖Ms5.3地震,为该区域中强地震对比分析研究提供参考依据。

This article takes the Mangya earthquake of magnitude 5.3 in Qinghai on December 19,2021 as the research object,and analyzes in depth the tectonic background,earthquake sequence,focal mechanism solution and apparent stress characteristics of the earthquake.The results show that the seismogenic structure of this earthquake is the northern margin fault of Qaidam Basin,the type of earthquake sequence is the main shock aftershock type.The focal mechanism solution is the thrust and strike slip type,and the apparent stress is near the mean line of apparent stress with M_(L) ≥ 3.0 in Qinghai,and the variation in the sequence apparent stress is stable.This result is conducive to our understanding of the Mangya Ms5.3 earthquake and provides a reference to the comparative analysis of medium strong earthquakes in this area.