JOPENS常用定位方法对台湾中深源地震定位差异分析
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摘要
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。
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 earthquake rapid reports.This paper uses common methods to locate earthquakes by MSDP,an interaction 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 70km(shallow earthquakes),between 70 km and 300km(intermediate earthquakes),and greater than 300km(deep earthquakes).The focal depth is an important parameter for seismic studies,seismic tectonics,seismic risk assessment,and seismic event identification.Focal depth's accuracy affects our understanding of the focal process,fault tectonics,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 Taiwan 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 earthquakes.Therefore,developing a fast and accurate location method for intermediate and deep earthquakes is of great significance to rapid earthquake reporting.
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 earthquake rapid reports.This paper uses common methods to locate earthquakes by MSDP,an interaction 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 70km(shallow earthquakes),between 70 km and 300km(intermediate earthquakes),and greater than 300km(deep earthquakes).The focal depth is an important parameter for seismic studies,seismic tectonics,seismic risk assessment,and seismic event identification.Focal depth's accuracy affects our understanding of the focal process,fault tectonics,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 Taiwan 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 earthquakes.Therefore,developing a fast and accurate location method for intermediate and deep earthquakes is of great significance to rapid earthquake reporting.
引文
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[8]张有明,陈珊桦,罗开奇,等.极值理论在台湾地区地震趋势预测中的应用[J].华南地震,2013,33(3):55-64.ZHANG You-ming,CHEN Shan-hua,LUO Kai-qi,et al.Extreme-Value Theory Application Research about Earthquake Tendency Prediction in Taiwan[J].South China Journal of Seismology,2013,33(3):54-64.(in Chinese)
[2]王周元,何少林,李勇,等.中国中深源地震分布特征及其意义[J].西北地震学报,2000,22(3):288-295.WANG Zhou-yuan,HE Shao-lin,LI Yong.et al.Distribution Feature of Intermediate and Deep-focus Earthquakes In China and its Significance[J].Northwestern Seismological Journal,2000,22(3):288-295.(in Chinese)
[3]韩京,周仕勇,黄建英,等.新疆地震目录中的中源地震定位问题研究[J].内陆地震,2004,18(2):113-121.HAN Jin,ZHOU Shi-yong,HUANG Jian-ying.et al.Location Study of Earthquakes with Mid-deep Source in XinJiang Seismic Catalogue[J].Inland Earthquake,2004,18(2):113-121.(in Chinese)
[4]赵金花,李波,陆汉鹏,等.单一地震事件与多个地震事件的定位方法及应用[J].地震地磁观测与研究,2007,28(4):15-19.ZHAO Jin-hua,LI Bo,LU Han-peng.et al.The Earthquake Location Methods for Sing-le Seismic Event and a Number of Seismic Events and their Application[J].Seismological and Geomagnetic Observation and Research,2007,28(4):15-19.(in Chinese)
[5]蔡杏辉,曹轶,许振栋.福建与台湾地震台网测定震级偏差浅析[J].防灾科技学院学报,2013,15(3):72-77.CAI Xing-hui,CAO Yi,XU Zhen-dong.Deviation Analysis of Earthquake Magnitude Determination by Fujian And Taiwan Seismic Network[J].Journal of Institute of Disaster Prevention,2013,15(3):72-77.(in Chinese)
[6]陈贵美,刘锦,刘军,等.数字地震台网对不同区域地震事件的震中定位研究[J].华北地震科学,2010,28(1):59-64CHEN Gui-mei,LIU Jin,LIU Jun,et al.Analysis on Precision of Deferent Earthquake Location Methods in Guangdong Digital Seismic Network[J].North China Earthquake Sciences,2010,28(1):59-64.(in Chinese)
[7]冯建刚,蒋长胜,韩立波,等.1970年以来甘肃台网地震观测报告收集整理及其重新定位研究[J].西北地震学报,2012,34(3):289-293.FENG Jian-gang,JIANG Chang-sheng,HAN Li-bo.Collection and Reestablish Work for the Earthquake Observation Reports of the Gansu Seismographic Net work since 1970and Earthquake Relocation[J].Northwestern Seismological Journal,2012,34(3):289-293.(in Chinese)
[8]张有明,陈珊桦,罗开奇,等.极值理论在台湾地区地震趋势预测中的应用[J].华南地震,2013,33(3):55-64.ZHANG You-ming,CHEN Shan-hua,LUO Kai-qi,et al.Extreme-Value Theory Application Research about Earthquake Tendency Prediction in Taiwan[J].South China Journal of Seismology,2013,33(3):54-64.(in Chinese)
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