【摘要】 利用福建仙游震区附近的3个数字地震台记录的仙游地震序列波形资料,采用PITSA软件,对2013年9月4日仙游ML5.0地震发生前后73个前、余震的P波、S波拐角频率比值进行分析。结果表明:3个地震台的拐角频率比值在主震前均出现较明显的下降趋势,不同台站间主震前后的变化形态存在较明显差异。更多还原

【Abstract】 By using wave data of Xianyou earthquake sequence recorded by three stations near the Xianyou epicenter region in Fujian, the paper analyzes the P, S wave corner frequency ratio of 73 earthquakes before and after the Xianyou ML5.0 earthquake sequence on Sep. 4th, 2013 by using the PITSA software. The result shows that the corner frequency ratio of the 3 stations has obvious downward trend before the main earthquake, and it is changing shape different between different stations before and after the main earthquake.更多还原