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地震 ›› 2006, Vol. 26 ›› Issue (1): 26-34.

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云南地区地震序列的波速比(VP/VS)异常研究

黎明晓, 刘杰   

  1. 中国地震台网中心, 北京 100036
  • 收稿日期:2005-06-06 修回日期:2005-08-10 发布日期:2021-11-01
  • 作者简介:黎明晓(1978-), 女, 辽宁庄河人, 2004年获硕士学位, 主要从事数字地震波资料的应用等研究。
  • 基金资助:
    “十五”国家科技攻关项目(2004BA601B01-04-03)

Study on velocity ratio (Vp/Vs) anomaly of earth- quake sequences in Yunnan region

LI Ming-xiao, LIU Jie   

  1. China Earthquake Network Center, CEA, Beijing 100036, China
  • Received:2005-06-06 Revised:2005-08-10 Published:2021-11-01

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摘要： 针对2000年姚安6.5级、 2001年施甸5级、 2001年永胜6.0级和2003年大姚6.2、 6.1级地震序列, 分别采用多台法和固定台站方法计算了这些地震序列的波速比。 由于采用的均是数字波形资料, 到时读取精度达到0.02s。 考虑台站因素, 计算波速比的置信度最低达到95%。 文中讨论强余震之前波速比的变化特征, 发现强余震前出现波速比趋势性下降的特征, 这对强余震的短临预测有实用价值; 主震发生时和发生以后波速比的波动范围的对比, 对震区的震情趋势判定有一定的指示和参考。

关键词: 地震序列, 多台法, 固定台站法, 波速比异常, 云南地区

Abstract: The multi-station method and fixed-station method are applied to calculate velocity ratio of four earthquake sequences, which are Yao'an M6.5 in 2000, Shidian M5.0 in 2001, Yongsheng M6.0 in 2001 and Dayao M6.2, M6.1 earthquake sequences in 2003. The accuracy for reading arrival time of waveform is 0.02 seconds when using digital data. The confidence is at least 95% on calculating velocity ratio when considering station factor. The results show that there is a decreasing trend of velocity ratio before strong aftershocks. It is of practical value on the short-imminent term prediction of strong aftershocks. In addition, the comparison of the variation range of velocity ratio between the time when mainshock occurs and the time after mainshock can be as a reference index on studying seismic tendency of earthquake sequence.

Key words: Earthquake sequence, Multi-staiton method, Fixed-station method, Velocity ratio anomaly, Yunnan region

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