CAP方法反演震源机制的台站布局等影响探究--以福建仙游M≥3.0级地震事件为例

Research on Influence of Station Layout and Other Factors in Inversion of Focal Mechanism by CAP Method-Taking Fujian Xianyou M≥3.0 Earthquake Event for Example

福建地震台网在日常工作中需要用CAP方法快速并产出可靠的震源机制解。然而,CAP方法受台站布局、台站拾取数量等因素的影响,结果也存在着差异性。本文探索台站布局等因素,为快速产出较为可靠的震源机制解提供参考,缩短震源机制解产出用时。结果显示:在信噪比较高和初至震相清晰的波形数据下,福建仙游地震序列可采取震中距50~130km或者震中距50~100km和150~200km相结合反演,效果较佳,与采用TDMT法反演福建仙游ML>3.5级6次地震的结果相似。

The Fujian Seismic Network quickly produces reliable focal mechanism solutions in daily work by using CAP method.However,the CAP method is affected by factors such as the station layout and the picking number of stations,and the results are also different.This article explores factors such as the station layout to provide a reference for the rapid production of more reliable focal mechanism solutions,and to shorten the time required for the production of focal mechanism solutions.The results show that:under the waveform data with high signal-to-noise ratio and clear onset seismic phases,the Xianyou earthquake sequence in Fujian can be inverted with a combination of epicenter distance of 50-130 km or epicenter distance of 50-100 km and 150-200 km,with better effect,which is similar to the inversion results of 6 earthquakes with ML>3.5 magnitude in Xianyou City of Fujian Province by using TDMT method.