吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (6): 1897-1904.doi: 10.13278/j.cnki.jjuese.20190157
• 地球探测与信息技术 • 上一篇
阮庆丰1, 刘财1, 刘俊清2, 张宇2, 郑国栋2
Ruan Qingfeng1, Liu Cai1, Liu Junqing2, Zhang Yu2, Zheng Guodong2
摘要: 基于区域地震台网的数字化波形资料,使用ISOLA方法对2019年5月18日吉林松原M5.1地震进行矩张量反演,研究地震的震源机制,并且收集了地震序列中ML2.5以上地震的震源机制解,采用FMSI(focal mechanism stress inversion)方法反演震中区构造应力场。结果显示:松原M5.1地震的矩震级为4.9,矩心深度为6 km,双力偶分量为91.5%,主压应力P轴方位角、倾角分别为76°和3°,主张应力T轴方位角、倾角分别为166°和16°,震源机制解显示典型的构造地震特征;震中区构造应力场理论应力轴σ1方位角、倾伏角分别为88.0°和0.9°,σ2方位角、倾伏角分别为178.2°和9.6°,σ3方位角、倾伏角分别为352.5°和80.4°,这一结果与区域构造应力场一致。推断认为区域构造应力场触发了2019年松原M5.1地震活动,地震震源机制解的北西向节面与震中区附近的第二松花江断裂现今活动性质完全一致,认为第二松花断裂可能是松原M5.1地震的发震断层。
中图分类号:
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