基于江苏台网的南黄海地区震源深度分析  

Focal Depth Analysis Based on Jiangsu Seismic Network in South Yellow Sea Area

作　　者：周康雅 王丽 殷翔[1] 张耀[1] 丁烨[1] 胡光武[1] ZHOU Kangya;WANG Li;YIN Xiang;ZHANG Yao;DING Ye;HU Guangwu(Jiangsu Earthquake Agency,Nanjing 210014,China)

机构地区：[1]江苏省地震局,南京210014

出　　处：《华北地震科学》2020年第4期61-67,共7页North China Earthquake Sciences

基　　金：中国地震局监测、预测、研究三结合项目(CJH-201901014)。

摘　　要：针对南黄海地区地震空间分布及地震构造的区域性特点,选取2013—2018年江苏测震台网记录到的52次南黄海地区的地震事件,采用日常定位方法(即单纯形、HypoSAT和LocSAT)分别在iasp91及华南速度模型下对其震源深度进行重新定位分析。结果表明:在对南黄海地震进行深度测定时,随着空隙角增大,几种参数配置下的深度测定值的稳定性均有所减小,单纯形法对速度模型依赖程度相对较小,但与空隙角大小关联更为密切;两种模型下,LocSAT定位结果均无明显优势深度,且受震相因素影响明显,HypoSAT方法适用范围相对较宽,计算结果稳定,配置iasp91模型则更适合于南黄海地震的震源深度测定。In this paper,52 earthquakes recorded by the Jiangsu Seismic Network from 2013 to 2018 in the South Yellow Sea area are relocated using three types of locating methods:Simplex algorithm,HypoSAT,LocSAT according to the spatial distribution of earthquakes and regional characteristics of seismic structures under the iasp91 and south China velocity models.The results show that the stability of the source depth decreases with the increase of the gap angle.Simplex algorithm is less dependent on the velocity model,but more closely related to the gap angle.Under the two models,LocSAT results have no obvious dominant depth and are significantly affected by seismic phase factors.The HypoSAT method has a relatively wide application range and stable calculation results.Under the iasp91 model,it is more suitable for the determination of the source depth of the south yellow sea earthquake,which can meet the needs of the current daily work.

关 键 词：江苏台网 南黄海地区 震源深度 

分 类 号：P315.63[天文地球—地震学]