论文部分内容阅读
1937年1月7日青海托索湖7.5级地震形变带长达300公里,总体走向北70°西,与库赛湖—玛曲断裂带展布完全吻合。该形变带由一系列陡坎、鼓包、张裂缝、鼓梁和陷坑组成。各种形变现象的组合显示发震断裂具压扭(反时针扭动)特征。反映了震区应力场主压应力方向为北东东—南西西向。由于主要以隆起、凹陷形式出现的北北西向构造在震区和北西西向的库玛断裂反接复合,为库玛断裂反时针错动造成阻抗,引起应力在此大量积聚。这是导致这次大震发生的根本原因。
On January 7, 1937, the Taino Lake Ms 7.5 earthquake deformation belt reached 300 km in length and moved northward to 70 ° west, exactly matching the distribution of the Kusai Lake-Maqu Fault Zone. The deformation zone consists of a series of scarps, bulges, cracks, drums and pits. The combination of various deformation phenomena shows that the seismogenic fault has the characteristics of twist (counterclockwise twist). The direction of the principal compressive stress of the stress field in the earthquake zone is north east-south-west-west. Due to the uplifted and depressed NW-trending tectonic structures, the Kuma fault in the seismic zone and the NWW is reversely combined and the impedance is caused by the counterclockwise dislocation of the Kuma fault, causing a large accumulation of stress. This is the root cause of the earthquake.