昆仑山口西8.1级地震前库尔勒测区相对应力场变化
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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1400kPa,剪应力增大了523kPa。研究了相对应力场的基本特点,并讨论了有关问题。
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 g reat strain change. After making sure the anomaly in the field several times and through argumentation, it has been affirmed that the anomaly is reliable. Accor ding to the data recorded at Ku′erle station, the relative stress field is calc ulated, analyzed and discussed. The result indicates that the principle stress d irection before the MS 8.1 earthquake in the western Kunlun Pass appeared change of deflection, the largest deflection amplitude extended 83 The change o f principle stress reached 1400 kPa. The shearing stress rose by 523kPa. The bas ic characteristics of relative stress field are investigated and relevant questi ons are discussed.
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 g reat strain change. After making sure the anomaly in the field several times and through argumentation, it has been affirmed that the anomaly is reliable. Accor ding to the data recorded at Ku′erle station, the relative stress field is calc ulated, analyzed and discussed. The result indicates that the principle stress d irection before the MS 8.1 earthquake in the western Kunlun Pass appeared change of deflection, the largest deflection amplitude extended 83 The change o f principle stress reached 1400 kPa. The shearing stress rose by 523kPa. The bas ic characteristics of relative stress field are investigated and relevant questi ons are discussed.
引文
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