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晋东北(北纬38°30′～41°00′,东经113°00′～115°20′)地区包括怀来—西安裂谷系的北端,历史强震和现代地震都较频繁,还有第四纪火山分布.这些地质现象的深部构造背景是什么?浅层构造与深部构造有什么关系?前人论及不多.此次工作研究思路和方法是在详细收集区内地层厚度和密度的基础上,建立地质—密度模型,用重力三维正演方法,逐层消除浅部地质体对布格异常的干扰(“剥皮”),从而获得一套不同深度的剩余重力异常和代表下地壳底部介质密度差异的剩余深部重力异常.然后选取通过本区的D.S.S.剖面上一个莫霍深度值,反演全区地壳厚度.共处理数据37.5万个.
The northern part of the northeastern Shanxi (38 ° 30 ’~ 41 ° 00’ north latitude, 113 ° 00 ’~ 115 ° 20’ east longitude) includes the northern part of the Huai Lai-Xi’an rift system with frequent strong historical and modern earthquakes. Quaternary volcano distribution. What is the deep tectonic setting of these geological phenomena? What is the relationship between the shallow structure and the deep structure? The predecessors have not discussed much. The research idea and method of this work is to collect the detailed information of the formation thickness and density Based on this, a geologic-density model is established and anomalous interference (“skinning”) of the shallow geologic bodies to the Bouguer layer is eliminated layer by layer by using the gravity three-dimensional forward method to obtain a set of residual gravity anomalies of different depths and represent the bottom of the lower crust The remaining deep gravitational anomalies with different media densities.Secondly, a Mho depth value on the DSS section of this area was selected to invert the crustal thickness of the whole area, and a total of 375,000 data were processed.