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地震 ›› 2003, Vol. 23 ›› Issue (4): 21-26.

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昆仑山口西8.1 级地震前祁连山地震带附近形变异常的演化特征

牛安福1, 张晶1, 张晓青2, 高原3, 延旭东1   

  1. 1.中国地震局分析预报中心, 北京 100036;
    2.青海省地震局, 青海西宁 810001;
    3.甘肃武都中心台, 甘肃武都 746000
  • 收稿日期:2002-12-30 修回日期:2003-05-19 出版日期:2003-10-31 发布日期:2021-12-21
  • 作者简介:牛安福( 1964-), 男, 山东单县人, 2000 年获博士学位, 研究员, 主要从事地壳形变与地震关系及短期、短临预测等方面的研究。
  • 基金资助:
    国家科技攻关项目( 2001BA601B02-02); 地震科学联合基金项目( 102069)

Evolutional characteristics of ground deformation observed along the Qilian Mt.Before the Kunlun Mountain MS 8.1 earthquake

NIU An-fuα1, ZHANG Jingα1, ZHANG Xiao-qing2, GAO Yuan3, YAN Xu-dong1   

  1. 1. Center for Analysis and Prediction, CSB, Beijing 100036;
    2. Seismological Bureau of Qinghai Province, Xining 810001;
    3. Wudu Seismic Station, Gansu Province, Wudu 746000, China
  • Received:2002-12-30 Revised:2003-05-19 Online:2003-10-31 Published:2021-12-21

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摘要： 昆仑山口西8.1 级地震前在我国祁连山地震带附近观测到一系列的巨幅形变异常, 这些异常包括了地倾斜、地应力和地应变等测项。文中对这些形变异常进行了研究, 并给出了昆仑山口西8.1 级地震前形变异常的分布特征:乐都、兰州、门源和肃南地倾斜异常的幅度、持续时间与昆仑山口西8.1 级地震震级之间满足形变异常特征与地震强度之间的一般性统计关系;德令哈地应力观测曲线在震前出现了较明显的转折, 最大应力扰动方向与地震方位密切相关;武都应变观测曲线在昆仑山口西8.1 级地震前出现了幅度较大的异常, 最大剪应变方向为西偏北23°~ 44°, 应变变化幅度与地震震级之间也满足上述统计关系。研究结果表明, 祁连山地震带附近出现的一系列应力、应变和倾斜巨幅异常与昆仑山口西8.1 级地震有一定的相关性。

关键词: 应力, 应变, 倾斜, 昆仑山口西8.1 级地震

Abstract: A series of deformation anomalies with g reat amplitude along the Qilian seismic belt have been observed prior to the Kunlun mountain MS 8.1 earthquake.Studied the characteristics of g round tilt, stress and st rain, we have obtained the following results:the amplitudes and duration of tilt s observed at Ledu, Lanzhou, Menyuan and Sunan station satisfied the general statistic relat ionship between them and the magnitudes of st rong earthquakes;Observed st ress curve has obvious turn, the di rection of maximum stress change is closely related to the azimuth of earthquake location.The observed st rain cure at Wudu station shows clear anomaly, and the direction of maximum shear st rain is NW 23°~ 44°, and the strain ampli tude also satisf ied the above-mentioned relat ionship.So the researched results demonstrated that the st ress, strain and tilt anomalies are related to the Kunlun Mountain MS 8.1 earthquake.

Key words: St ress, Strain, Tilt, Kunlun Mountain MS 8.4 g reat earthquake

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