2024年1月23日乌什MS7.1地震序列频谱偏移特征分析
SEISMIC SEQUENCE SPECTRUM MIGRATION OF WUSHI MS7.1 EARTHQUAKE ON JANUARY 23,2024
刘萍 1宋春燕 1牛中华1
作者信息
- 1. 新疆维吾尔自治区地震局,新疆乌鲁木齐 830011
- 折叠
摘要
采用P波初动方法计算了乌什MS7.1地震序列中MS≥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MS7.1地震序列中MS≥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.
Abstract
The focal mechanism solution of MS≥4.0 earthquake in Wushi MS7.1 earthquake se-quence is calculated by P-wave first motion method.The focal mechanism solution has the character-istics 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 MS≥5.0 earthquake sequence in Wushi MS7.1 earthquake sequence is calculated by using the digital wave-form data of Xinjiang seismic network and the fast Fourier transform method.The calculation results show that the frequency spectrum of the MS≥5.0 aftershocks in Wushi County has the characteris-tics of spectrum migration in the early stage,and the frequency band of the last MS≥5.0 earthquake becomes wider,and the frequency spectrum migration characteristics disappear.The 5-magnitude aftershocks in Aheqi County all showed spectral migration characteristics.
关键词
乌什MS7.1地震/震源机制解/频谱偏移法Key words
Wushi MS7.1 earthquake/Focal mechanism/Spectrum deviation method引用本文复制引用
基金项目
新疆地震科学基金(202317)
自治区自然科学基金(2023D01A104)
出版年
2024
NETL
NSTL
万方数据