2018年5月28日吉林省松原市宁江区发生MS 5.7地震，黑龙江省牡丹江和漠河地震台重力仪均记录到此次地震事件，基于所记录面波的初动方向、同震响应延迟时间、最大震幅以及同震持续时间，分析2个监测站重力监测数据同震响应特征。结果表明，漠河地震台因震中距较远，同震响应延迟时间较长、最大震幅较小。以牡丹江地震台重力数据为例，采用Venedikov调和分析方法，对重力固体潮进行仪器零漂改正和气压改正，结果发现，该台重力固体潮非潮汐大幅变化可能与仪器灵敏度下降有一定关系，其相关性有待进一步研究。
On May 28, 2018, an earthquake with a magnitude of 5.7 occurred in Ningjiang District, Songyuan City, Jilin Province, which was recorded by the gravimeters at both Mudanjiang and Mohe Seismic Stations in Heilongjiang Province. This paper analyzed the co-seismic response characteristics of the gravity monitoring data at the two stations based on the first motion direction of the recorded surface waves, the delay time, maximum amplitude, and duration of the co-seismic response. The results show that the Mohe Seismic Station has a longer delay time in co-seismic response and a smaller maximum amplitude due to a longer distance from the epicenter. Taking the gravity data from Mudanjiang Seismic Station as an example, the Venedikov harmonic analysis method was used to correct the instrument zero drift and air pressure for the gravity solid tide, and it was found that the large non-tidal change in the gravity solid tide at the station is related to the air pressure change inside the instrument, and their correlation needs further study.
2023,44（3）: 122-127 收稿日期：2023-01-30
DOI：10.3969/j.issn.1003-3246.2023.03.017
作者简介：李俊秋(1990-),女,硕士研究生,工程师,主要从事地球物理台网管理工作。E-mail:1261485961@qq.com
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