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地震 ›› 2001, Vol. 21 ›› Issue (2): 41-45.

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少震区前兆异常的特征分析*

吴富春, 刘春   

  1. 陕西省地震局,陕西西安 710068
  • 收稿日期:2000-11-03 修回日期:2000-11-27 出版日期:2001-04-30 发布日期:2022-10-27
  • 作者简介:吴富春,男,江苏宜兴人研究员主要从事地震学地震分析预报和工程地震等研究。
  • 基金资助:
    地震科学联合基金项目(9507431)

Characteristic analysis and precursory anomaly in weak seismic region

WU Fu-chun, LIU Chun   

  1. Seismological Bureau of Shaanxi Province, Xi'an 710068, China
  • Received:2000-11-03 Revised:2000-11-27 Online:2001-04-30 Published:2022-10-27

摘要: 以陕西前兆台网24年的资料为基础,分析了少震区前兆异常的一些特征。在这个建网以来未发生过5级以上地震,每年平均发生2~3次3级多地震,年最大震级的平均值仅为3.6级的陕西前兆台网中,每年年度会商所提出的各类测项异常比在11%~20%之间,综合异常比为15%。这些异常比的变化曲线与陕西省内地震频次和强度变化曲线不同步,它们是与地震无关的测值变化,可能是未被人们认识的外界干扰,也可能是地壳内部应力积聚又释放但又无地震发生的一种地壳蠕动结果。

关键词: 少震区, 前兆异常, 无震滑动, 特征分析

Abstract: Based on the data of precursory anomaly observ ed in Shaanxi Precursory Network, weanaly zed the characteristics of precurso ry anomaly in the regions where there are noorfew earthquakes. The ratio of precursory anomaly is betw een 11% to 20% for different precursory means and the comprehensive ratio of anomaly is 15% in Shaanxi Precursory Netwo rk. There is no earthquake wi th MS ≥ 5.0 and usually only two to three earthquakes with MS ≥ 3.0 occurred ev ery year and the average magni tude of maximum earthquakes for ev ery year is ML = 3.6. The curvevariation betw een the anomaly ratio, seismicf requency and seismic intensi ty in Shaanxi region is not sy nchronal. So, it is concluded that the precurso ry anomaly is not the earthquake precursor, and it may be the interference unknownor the result of aseismic slipping in crust.

Key words: Weak seismic region, Precursory anomaly, Aseismic slipping, Characteristic analysis

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