论文部分内容阅读
基于2013~2015年西天山地区流动重力观测资料,结合区域地震目录,分析研究区域重力场时空变化与地震的关系。结果表明:1)重力场变化反映出西天山地区是构造运动活跃的地区,重力场变化的“增强-减弱-增强”过程与区域地震活动趋势的“活跃-平静-活跃”相对应,西天山区域重力场变化与塔里木板块北漂旋转相关。2)西天山地区震中多出现在重力变化接近为零的断层附近,震中附近重力变化较为剧烈,震中区水平梯度方向接近该区域断层走向。3)西天山区域地震前,跨断层测段剖面出现转折图像。
Based on the observed data of mobile gravity in the western Tianshan Mountains from 2013 to 2015 and the regional earthquake catalogs, the relationship between the spatial and temporal variations of regional gravitational fields and earthquakes is analyzed. The results show that: 1) The change of gravity field reflects that the western Tianshan Mountains are active areas with active tectonic movements, the process of “strengthening-weakening-enhancing” and the “active-calm-active” phase of regional seismic activity Correspondingly, the change of gravity field in the western Tianshan Mountains is related to the north drift of the Tarim plate. 2) The epicenter of the western Tianshan Mountains appeared mostly in the vicinity of the fault whose gravity change was near zero. The gravity change near the epicenter was rather violent, and the horizontal gradient direction of the epicenter was close to that of the fault in this area. 3) Before the West Tianshan earthquake, a transitional image appears across the cross-section.