东北地区重力均衡异常特征的初步研究

地震地质 ›› 1986, Vol. 8 ›› Issue (3): 61-68.

东北地区重力均衡异常特征的初步研究

李润江¹, 佟淑娟¹, 孟令顺², 张琳², 张凤华²

1. 东北地震监测研究中心;
2. 长春地质学院

收稿日期:1984-10-31 出版日期:1986-09-03 发布日期:2009-11-25

PRELIMINARY STUDY ON THE STATE OF ISOSTATiC EQUILIBRIUM IN THE NORTHEAST CHINA

Li Runjiang¹, Tong Shujuan¹, Meng Lingshun², Zhang Lin², Zhang Fenghua²

1. Center for Earthquake Research in Northeast China;
2. Changchun College of Geology

Received:1984-10-31 Online:1986-09-03 Published:2009-11-25

摘要/Abstract

摘要： 本文利用地面实测重力资料和地形高程资料,采用普拉特-海福特(Pratt-ttayford)重力均衡理论模型,取1°×1°方格网,通过使用现成改正表格查取改正值与个别计算点用理论公式计算作校核的方法,计算了我国东北地区75个计算点的均衡重力异常值;并对局部第四系覆盖较厚地区作了第四系密度改正;在此基础上,构制了我国东北N39°—49°,E121°—131°大部分地区的均衡重力异常图;结合区域布格重力异常和区域空间重力异常特征以及莫霍界面的起伏特点作了对比分析和讨论。

Abstract: In order to provide some fundamental data,we calculated the isostatic anomalies in most parts of the region (N39?-49?;E121?-131?) by means of Pratt-Hayford isostatic model and using 1白1? square mesh and the isostatic anomaly map of overall region and the 2白2皉egional isostatic anomaly maps were compilated.The calculations show for this region a configuration of anomaly characteristic of alternate anomalies NNE-trending and an extensive anomalous area in agreement with the relief of Moho.It has been shown that isostatic anomalies are generally in agreement with the high relief and regional Bouguer gravity and free-air gravity anomalies,with areas where isostatic anomalies are not or not well concordant with the Moho relief and the their strike,suggesting an isostatic adjustment for these segments,which is likely to be not interpreted as the Moho relief.These segments are in a state of mass imbalance and deserve to pay more attention and further study for the prediction of earthquakes.

李润江, 佟淑娟, 孟令顺, 张琳, 张凤华. 东北地区重力均衡异常特征的初步研究[J]. 地震地质, 1986, 8(3): 61-68.

Li Runjiang, Tong Shujuan, Meng Lingshun, Zhang Lin, Zhang Fenghua. PRELIMINARY STUDY ON THE STATE OF ISOSTATiC EQUILIBRIUM IN THE NORTHEAST CHINA[J]. SEISMOLOGY AND EGOLOGY, 1986, 8(3): 61-68.