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地震 ›› 2002, Vol. 22 ›› Issue (2): 53-59.

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区域数字地震台网近距离面波震级MS的测定

陈祥熊, 杨贵, 傅再扬, 陈文明   

  1. 福建省地震局,福建福州 350003
  • 收稿日期:2001-07-16 修回日期:2001-09-27 出版日期:2002-04-30 发布日期:2021-12-21
  • 作者简介:陈祥熊(1942-),男,福建福州人,研究员,主要从事震源物理、数字地震观测与研究。
  • 基金资助:
    福建自然科学基金项目(D9910018); 中国地震局合同制项目

Determination of near-distance surface wave magnitude MS by usingregional digital seismic network

CHEN Xiang-xiong, YANG Gui, FU Zai-yang, CHEN Wen-min   

  1. Seismological Bureau of Fujian Province, Fuzhou 350003, China
  • Received:2001-07-16 Revised:2001-09-27 Online:2002-04-30 Published:2021-12-21

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摘要： 使用福建区域数字台网7个宽带台观测到的47个发生于台湾地区的浅源强震(MS ≥ 5)的近距离面波记录,量算了水平向乐夫波的最大合成振幅及震中距离,测定了所有这些强震的近距离面波震级MS。并将结果与国家台网公布的远距离平均MS震级进行比较和统计分析。结果表明,近距离测定的面波震级比远距离测定的MS 有较大偏差。震级越小、距离越近,差异越大。对于区域地震台网测定的MS 震级,需要做必要的修正,才能使其测定结果尽可能接近于国家台网公布的平均MS 震级。文中还讨论了近距离和远距离面波震级测定差异的原因,及其修正办法。可供区域数字宽带台网速报本区域发生的近距离强震面波震级时参考。

关键词: 区域宽带数字地震台网, 波形仿真, 近距离面波, MS 震级修正

Abstract: In this paper, using surface wave data of 48 shallowstrong earthquakes (MS>5) occurred in Taiw an region and recorded at 7 broad b and seismic stations by using Fuji and igital seismic network, we measured the maximum synthetical amplitudes of horizontal directional Love waves and the epicentral distance, and calculated their surface eave magnitudes MS. We alsocompared the results with the average MS published by national seismic networks well as carried out statistical analysis. The results show that thedetermined MS magnitudes between regional and national networks have larger difference. The larger the magnitude is, the smMS aller the difference. It is necessary tomake certain correction for MS magnitudes of regional network so that they could be close to the resultsdetermined by the national network. In this paper, we also discussed the cause of the difference of MS magnitudesdetermined by near stations and rem ote stations as well as its correct methods. It might provide the reference for the regional digital seismic networks that rapidly report MS magnitudes of those strong earthquakes occurred in neardistance.

Key words: regional broad-b and digital seismic network, Waveform emulation, Neardistant surface wave, MS magnitude correction

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