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作者在研究了许多震前地下油、水喷涌型异常以后,曾提出一个“在脉冲状构造力作用下单一水层二维径向对称非稳定流渗流模式”作为该异常的前兆机理。本文根据两次震前地下水喷涌型异常的观测资料,定量地验证了这种机理解释的正确性。在此基础上,根据这种理论反演出一些地震前局部应力场的快速变化:1979年7月9日新疆米泉县4.3级地震震前约30天,作用在该地区5号井1600米深处水层上的地下应力垂直分量突增1.3×10~5帕斯卡,持续约几十分钟后恢复正常;1983年6月1日该区5.3级地震震前4天,同一井的水层处应力突增4×10~3帕斯卡,持续11小时40分钟恢复正常;同理,估计在1965年11月13日该区6.9级地震震前2个月,应力突增1.7×10~5帕斯卡,持续几十分钟恢复正常。本文还对这些现象进行了讨论。
After studying many anomalous subsurface oil and water gushing anomalies prior to the earthquake, the authors proposed a “two-dimensional radially symmetric unsteady flow seep flow pattern of a single water layer under pulsatile tectonic force” as a precursor mechanism to this anomaly. Based on the observation data of groundwater gushing anomalies before two earthquakes, this paper quantitatively verifies the correctness of this mechanism explanation. On the basis of this theory, some rapid changes of the local stress field before the earthquake are inferred based on this theory: about 30 days before the quake 4.3 magnitude earthquake in Miquan County, Xinjiang on July 9, 1979, acting at a depth of 1,600 meters The vertical component of the subsurface stress on the water surface suddenly increased by 1.3 × 10 ~ 5 Pascal, and returned to normal after tens of minutes. On June 1, 1983, four days before the M 5.3 earthquake, the stress in the water layer of the same well By 4 × 10 ~ 3 Pascal, sustained 11 hours and 40 minutes back to normal; Similarly, it is estimated that in November 13, 1965 2 months before the earthquake 6.9 earthquake, the sudden increase in stress 1.7 × 10 ~ 5 Pascal, for several Ten minutes back to normal. This article also discusses these phenomena.