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地震 ›› 2003, Vol. 23 ›› Issue (3): 89-96.

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昆仑山口西8.1 级地震前库尔勒测区相对应力场变化

蒋靖祥, 尹光华, 许凤柱   

  1. 新疆维吾尔自治区地震局, 新疆乌鲁木齐 830011
  • 收稿日期:2002-07-02 修回日期:2002-10-17 出版日期:2003-07-31 发布日期:2021-12-21
  • 作者简介:蒋靖祥(1956-), 女, 河南永城人, 副研究员, 主要从事地壳应变及地震预报等研究。
  • 基金资助:
    “ 十五” 国家科研攻关项目(01-03-03)

Relative stress field change of Ku' erle Region before 8.1 earthquake in western Kunlun Pass

JIANG Jing-xiang, YIN Guang-hua, XU Feng-zhu   

  1. Seismological Bureau of Xinjiang Uygur Autonomous Region, Urumqi 830011, China
  • Received:2002-07-02 Revised:2002-10-17 Online:2003-07-31 Published:2021-12-21

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摘要： 2001 年昆仑山口西MS8.1 地震震前, 库尔勒台站钻孔应变仪记录到了特大应变变化, 经多次异常落实、实地调查并进行了多次论证, 确认异常是可靠的。根据库尔勒台记录资料计算了相对应力场并对其进行了分析、讨论。结果表明, 昆仑山口西MS8.1 地震前主应力方向出现偏转变化, 最大偏转量达83°。主应力值变化达1400 kPa, 剪应力增大了523 kPa 。研究了相对应力场的基本特点, 并讨论了有关问题。

关键词: 昆仑山口西MS8.1 地震, 钻孔应变, 相对应力场, 应力方向偏转, 库尔勒测区

Abstract: Before the MS 8.1 earthquake happened in November 14, 2001 in the western Kunlun Mountain Pass, the borehole strain gauge at Ku' erle station recorded a great strain change.After making sure the anomaly in the field several times and through argumentation, it has been affirmed that the anomaly is reliable.According to the data recorded at Ku′erle station, the relative stress field is calculated, analyzed and discussed.The result indicates that the principle stress direction before the MS 8. 1 earthquake in the western Kunlun Pass appeared change of deflection, the largest deflection amplitude extended 83 The change of principle stress reached 1400 kPa.The shearing stress rose by 523kPa.The basic characteristics of relative stress field are investigated and relevant questions are discussed.

Key words: Western Kunlun Pass 8.1 Earthquake, Bore-hole strain, Relative stress field, Deflection of stress direction, Measuring section in Ku′erle

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