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张北地震序列波谱分析
引用本文:李雪英,高景春,刁桂苓,赵英萍,赵明淳.张北地震序列波谱分析[J].华北地震科学,2004,22(2):6-8.
作者姓名:李雪英  高景春  刁桂苓  赵英萍  赵明淳
作者单位:河北省地震局,河北,石家庄,050021
基金项目:国家"十五"科技攻关计划(2001BA601B01 01 05)资助
摘    要:采用石家庄遥测台网数字化的地震记录,选取了1998年1月~1999年12月张北震区的146条地震,分别对P波、S波作了波谱分析,求取了拐角频率、地震矩、震源半径、应力降、平均位错和波谱能量。分析了拐角频率和应力降随时间的变化趋势,并讨论了震源参数相互之间的关系。结果表明,在1999年3月11日5.6级地震之前应力降和拐角频率均出现异常,同时发现,S波对环境的变化比P波敏感,P波较稳定,且各震源参数与震级有一定相关。

关 键 词:波谱分析  震源参数  拐角频率  应力降
文章编号:1003-1375(2004)02-0006-03
修稿时间:2004年1月5日

Spectral analysis of Zhangbei earthquake series
LI Xue-ying,GAO Jing-chun,DIAO Gui-ling,ZHAO Ying-ping,ZHAO Ming-chun.Spectral analysis of Zhangbei earthquake series[J].North China Earthquake Sciences,2004,22(2):6-8.
Authors:LI Xue-ying  GAO Jing-chun  DIAO Gui-ling  ZHAO Ying-ping  ZHAO Ming-chun
Abstract:the source spectra of P and S wave for the digital records of 146 earthquakes from Jan. 1998 to Nov. 1999 in Zhangbei area recorded by Shijiazhuang telemetered seismic network are analyzed. In the analysis the corner frequency, seismic moment, focal radius, stress drop, average displacement and spectral energy are calculated. The variation of corner frequency and stress drop with time are analyzed, and the relations between focal parameters are discussed. The results indicated that the stress drop and corner frequency both showed anomalies before Zhangbei M_L5.6 earthquake occurred on Mar.11,1999. Meanwhile, S wave is more sensitive to the change of environment than P wave. The focal parameters are correlative with magnitude in some extent.
Keywords:spectral analysis  focal parameter  corner frequency  stress drop
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