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利用1992~2012年多期境内外天山西南地区GPS观测数据,计算得出天山西南及帕米尔地区现今构造变形运动速度场,并计算给出了研究区内最大主应变、剪应变率和面膨胀的分布情况。结果表明:在西天山地区受印度板块西构造结挤压作用下,帕米尔高原快速向北俯冲,造成天山沿这一经度带发生了强烈的地壳缩短;盆—山结合带的变形大于山体内部变形,形变幅度最大的地方往往就是历史上多次发生7~8级大震的地方;天山主压应变方向随经度增加逐渐由北北西向转向南北及北北东向,基本上与天山山脉走向垂直;主压应变较大的地区集中在西天山南北褶皱带上,最大剪应变率位于西天山南缘与帕米尔高原及西昆仑结合部,高值区是强地震的主要分布区。
Using the GPS observations from southwest Tianshan from 1992 to 2012, the present tectonic deformation velocities in southwestern Tianshan and Pamir are calculated and the maximum principal strain, shear strain rate and area expansion in the study area are calculated The distribution of The results show that the Pamirs rapidly subducted northward in the West Tianshan area under the pressure of western tectonic knots in the Indian plate, resulting in a strong crustal shortening along the longitude belt along the Tianshan Mountains. The deformation of the basin-mountain belt was greater than that of the interior of the mountain The places with the largest deformation and deformation are often the places where the magnitude 7-8 earthquake occurred many times in history. The main compressive strain direction of Tianshan gradually turns from North, West and West to North and South and North-North East along with the increase of longitude, which basically goes along with the Tianshan Mountains Vertical. The areas with large principal compressive strains are concentrated in the north-south fold belt of the West Tianshan Mountains. The maximum shear strain rate is located at the junction of the southern margin of the West Tianshan with the Pamirs and the Western Kunlun. The high value areas are the main distribution areas for strong earthquakes.