地震速报工作中S震相对震中位置影响分析  

ANALYSIS ON INFLUENCE OF S-PHASE ON EPICENTER POSITION IN ERATHQUAKE QUICK REPORT

作　　者：曹昌军 李艳永[1] 任林 唐明帅[1] CAO Chang-jun;LI Yan-yong;REN Lin;TANG Ming-shuai(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2022年第2期121-129,共9页Inland Earthquake

基　　金：国家自然科学基金项目(41674063).

摘　　要：通过数值模拟实验分析地震速报工作中定位台站及S震相选取对震中位置的影响,并结合新疆测震台网实际震例进一步分析验证。结果表明,对于震中包围较好的地震而言,S震相对震中位置的影响并不明显,一般情况下标2~4个清楚的S波震相即可;对于网缘或网外地震而言,不使用S震相定位震中可能出现较为明显的偏差,使用足够数量且震相识别较为准确的S波震相参与定位,才能得到较为可靠的定位结果。Through numerical simulation experiments,this paper analyzes the influence of positioning stations and S-phase selection on the epicenter position in the earthquake quick report work,and further analyzes and verifies it in combination with the actual earthquake examples of Xinjiang seismic network.The results show that for earthquakes with well surrounded epicenter,the influence of s earthquake on the epicenter position is not obvious.Generally,it is enough to mark 2~4 clear S-wave phases;For earthquakes at the edge of the network or outside the network,there may be obvious deviation in the epicenter without using S-phase.Only by using a sufficient number of S-wave seismic phases with more accurate seismic phase identification can we get more reliable positioning results.

关 键 词：地震速报 震中位置 地震定位 数值模拟实验 S震相 

分 类 号：P315.7[天文地球—地震学]