论文部分内容阅读
对台湾近15年来发生的267210个地震进行了全面重新定位。我们基于台湾中央气象局地震台网(CWBSN)的地震目录开展重定位并在3个方面对定位结果进行改善。第一,结合了台湾强地面运动仪器观测项目(台湾强地面运动仪器观测项目)680个台站记录的S-P到时的大量数据来改善台站记录在台湾岛的覆盖。第二,我们添加了琉球岛链南部的日本气象厅(JMA)的18个台站来改善对东部近海,特别是台湾东北消减带的地震的台站覆盖。第三,我们采用三维VP和VP/VS模型计算P和S波的理论走时。这些措施对地震重定位改善的效果可以在3个方面看出:(1)P波到时和S-P时间残差的减少;(2)能更好地理解地面峰值加速度和震中距的衰减关系;(3)对P波到时和S-P时间的台站校正模式具有地质意义。
A total of 267,210 earthquakes in Taiwan in the past 15 years have been completely relocated. Based on the seismic catalog of Taiwan’s Central Meteorological Bureau Seismological Network (CWBSN), we conducted relocation and improved the positioning results in three aspects. First, a large amount of data from the S-P arrivals recorded by 680 stations in the Taiwan Strong Surface Movement Instrumentation Observation Project (Taiwan Strong Surface Movement Instrumentation Observation Project) was used to improve the coverage of station records on the island of Taiwan. Second, we added 18 stations of the Japan Meteorological Agency (JMA) in the southern part of the Ryukyu Island chain to improve station coverage for earthquakes in the offshore areas in the east, especially in the northeastern Taiwan. Third, we use the three-dimensional VP and VP / VS models to calculate the theoretical travel time of P and S waves. The effect of these measures on the seismic relocation improvement can be seen in three aspects: (1) reduction of P wave arrival time and SP residual error; (2) better understanding of attenuation relationship between ground peak acceleration and epicenter distance; (3) It is of geological significance to station correction mode of P wave arrival and SP time.