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Title:: Comparative Analysis of the Instrumental Seismic Intensity and the Macro-seismic Intensity of the 2021 Yangbi,Yunnan M_S6.4 Earthquake

Author(s):: MING Xiaona; CUI Jianwen; YANG Jianqiang; YU Jiang; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: instrumental seismic intensity; macro-scopic seismic intensity; the Yangbi M_S6.4 earthquake; ground motion records

摘要:: 利用云南省强震动及地震预警台网获得的漾濞M_S6.4地震地震动记录数据,根据《中国地震烈度表》的仪器烈度计算方法,得到各台站的仪器地震烈度。对比分析了漾濞M_S6.4地震的仪器烈度图与宏观烈度图的异同,发现二者最高烈度相同、等震线长轴走向相似,但各烈度区面积与形状不相同; 对比分析了仪器烈度与调查点的评估烈度的吻合性,发现二者完全吻合的比例为81.25%,偏差±1度的比例为93.75%,说明仪器地震烈度在一定程度上能客观反映实际的震害情况。

Abstract:: According to the China Earthquake Intensity Table,we use the ground motion records of the Yangbi,Yunnan M_S6.4 earthquake on May 21,2021 obtained by strong-motion stations to calculate the instrumental seismic intensity.Then we compare the map of instrumental seismic intensity and the map of macro scopic seismic intensity of the Yangbi M_S6.4.We find that the two maps have the same highest intensity and the similar long axis of the isoseismal lines,but the area and shape of each intensity zone are different; the consistency of the instrumental intensity at the stations and the intensity on the corresponding survey sites is 81.25%,and the ratio of 1-degree deviation is 93.75%.It can be seen that the instrumental seismic intensity can objectively reflect the actual earthquake damage to some extent.