核幔衍射波Pdiff在巴里坤地震台记录特征及走时研究  

RECORDING CHARACTERS AND TRAVEL TIME OF PDIFF PHASE IN BARKOL SEISMIC STATION

作　　者：周康云 张录 张剑锋 高朝军 候赛因·赛买提 ZHOU Kang-yun;ZHANG Lu;ZHANG Jian-feng;GAO Chao-jun;Housaiyin Saimaiti(Hami Earthquake Monitoring Center Station,Hami 839000,Xinjiang,China)

机构地区：[1]哈密地震监测中心站,新疆哈密839000

出　　处：《内陆地震》2022年第2期167-177,共11页Inland Earthquake

基　　金：新疆地震科学基金(202016);新疆地震科学基金(202127).

摘　　要：利用巴里坤地震台2003~2019年甚宽频带波形资料,分析震中距90°~180°且M_(W)≥6.0的地震,得出Pdiff震相的起始记录震中距为97°。对Pdiff波进行不同周期仿真分析,发现有短周期记录,并使用Matlab软件,用最小二乘法拟合其走时函数。所得结果扩大了该震相记录范围,弥补了震中距144°~180°Pdiff波的走时空白,为分析识别该震相积累了经验,有助于对核幔边界D″层物质特征和结构的认识。Based on very broadband seismic waveform of Balikun seismic station from 2003~2019,the earthquakes with epicenter distance of 90°~180°and magnitude greater than 6 are analyzed,and the initial recorded epicenter distance of Pdiff phase is 97°.Through the simulation analysis of different periods of Pdiff waves,it is found that there are short period records,and the travel time function is fitted by least square method using Matlab software.The results expand the recording range of the seismic phase,make up the travel time gap of the epicenter distance of 144°~180°Pdiff wave,accumulate experience for the analysis and identification of the seismic phase,and contribute to the understanding of the material characteristics and structure of the Core Mantle Boundary D"layer.

关 键 词：Pdiff 核幔边界 Matlab 最小二乘法 震相特征 

分 类 号：P315.7[天文地球—地震学]