JOPENS 常用定位方法对台湾中深源地震定位差异分析

摘要

The Fujian network monitors earthquakes in the Taiwan region.The seismic stations are distributed beside the epicenter and there is a small opening angle between the seismic stations used for locating and the epicenter.Therefore,the locating methods for intermediate and deep earthquakes,which can be used to obtain better seismic parameters,will directly affect the earth-quake rapid reports.This paper uses common methods to locate earthquakes by MSDP,an interac-tion analysis software package in JOPENS (Java Open System).The results are then compared with the data from Taiwan’s official website to obtain the appropriate location methods for rapid earthquake reporting.The depth of the epicenter to the source is referred to as focal depth and is divided into three categories:less than 70 km (shallow earthquakes),between 70 km and 300 km (intermediate earthquakes),and greater than 300 km (deep earthquakes).The focal depth is an important parameter for seismic studies,seismic tectonics,seismic risk assessment,and seismic e-vent identification.Focal depth’s accuracy affects our understanding of the focal process,fault tec-tonics,and stress field.Because tectonic plates push into each other,the activities of intermediate and deep earthquakes reflect the driving forces of the plates.The region offshore to northeast Tai-wan is one of the active earthquake regions because it is located where the Eurasian and Pacific plates meet.Intermediate and deep earthquakes have different seismic phases than shallow earth-quakes.Therefore,developing a fast and accurate location method for intermediate and deep earth-quakes is of great significance to rapid earthquake reporting.%福建省地震台网负责监测中国台湾地区地震。由于属于网外范围，台站分布偏一侧，对于有一定深度的地震使用何种定位方法能获得较好的地震参数一直是个问题。本文利用 JOPENS 系统中交互分析软件 MSDP 提供的常用定位方法，使用福建省地震台网监测资料对台湾地区中深源地震进行定位，并将各种定位方法得出的结果与中国台湾公布的地震参数进行对比，分析两者结果的差异，进而找出合适的定位方法用于地震速报。