基于包络互相关定位方法的积石山M_(S)6.2地震前超低频地震研究  

Research on Very Low Frequency Earthquakes before the Jishishan M_(S)6.2 Earthquake Using Envelope Cross-Correlation Localization Method

作　　者：张晓阳 邓津[1,2] 李淑婷 ZHANG Xiaoyang;DENG Jin;LI Shuting(Lanzhou Institute of Seismology,CAE,450 West-Donggang Road,Lanzhou 730000,China;Lanzhou Geophysics National Observation and Research Station,450 West-Donggang Road,Lanzhou 730000,China)

机构地区：[1]中国地震局兰州地震研究所,兰州市730000 [2]兰州地球物理国家野外科学观测研究站,兰州市730000

出　　处：《大地测量与地球动力学》2025年第1期66-71,共6页Journal of Geodesy and Geodynamics

基　　金：兰州地球物理国家野外科学观测研究站项目(2021Y02);国家自然科学基金(51578518);甘肃省青年科技基金(22JR11RA089)。

摘　　要：利用包络互相关方法对积石山M_(S)6.2地震前的超低频地震进行定位。先在较大范围内进行初步定位,然后在较小范围内进行精确定位。通过增加或减少震源不同方位的台站数量进行分析,结果显示,台站在各个方位上的均匀分布至关重要,可以有效减小定位误差。定位结果表明,积石山地震前的超低频地震主要分布在断裂带附近,分布方位和断层方向保持一致。Utilizing the envelope cross-correlation method,we localize the very low frequency earthquakes(VLFEs)before the Jishishan M_(S)6.2 earthquake.We conduct preliminary localization over a larger area,followed by precise localization within a smaller area.Analysis by increasing or decreasing the number of stations in different directions from the epicenter reveals that an even distribution of stations in all directions is crucial,effectively reducing localization errors.The localization results indicate that the VLFEs before the Jishishan earthquake were primarily distributed near the fault zone,with their distribution orientation is consistent with the fault direction.

关 键 词：积石山地震 超低频地震 地震定位 包络互相关 

分 类 号：P315[天文地球—地震学]