摘要
采用P波初动方法计算了乌什M_(S)7.1地震序列中M_(S)≥4.0地震的震源机制解,震源机制解在时间上存在前期一致性较好,后期一致性紊乱的特点。空间上,乌什县内震源机制解类型多为逆冲型,阿合奇县内震源机制解类型多为走滑型。利用新疆地震台网数字波形资料和快速傅里叶变换方法,计算乌什M_(S)7.1地震序列中M_(S)≥5.0地震序列的频率谱,计算结果显示,乌什县内发生的5级余震前期有频谱偏移特征,最后一个5级地震频带变宽,频谱偏移特征消失;阿合奇县内发生的5级余震均出现了频谱偏移特征。
The focal mechanism solution of M_(S)≥4.0 earthquake in Wushi M_(S)7.1 earthquake sequence is calculated by P-wave first motion method.The focal mechanism solution has the characteristics of good consistency in the early stage and disordered consistency in the later stage.In space,the type of focal mechanism solution in Wushi County is mostly thrust type,and the type of focal mechanism solution in Aheqi County is mostly strike-slip type.The frequency spectrum of M_(S)≥5.0 earthquake sequence in Wushi M_(S)7.1 earthquake sequence is calculated by using the digital waveform data of Xinjiang seismic network and the fast Fourier transform method.The calculation results show that the frequency spectrum of the M_(S)≥5.0 aftershocks in Wushi County has the characteristics of spectrum migration in the early stage,and the frequency band of the last M_(S)≥5.0 earthquake becomes wider,and the frequency spectrum migration characteristics disappear.The 5-magnitude aftershocks in Aheqi County all showed spectral migration characteristics.
作者
刘萍
宋春燕
牛中华
LIU Ping;SONG Chun-yan;NIU Zhong-hua(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)
出处
《内陆地震》
2024年第2期135-142,共8页
Inland Earthquake
基金
新疆地震科学基金(202317)
自治区自然科学基金(2023D01A104)。
作者简介
刘萍(1985-),女,工程师,硕士,2013年毕业于新疆大学地质学专业,主要从事数字地震学研究.E-mail:275614382@qq.com。
