摘要
松辽盆地是我国经济发展最重要的区域之一,也是东北地震区MS≥6.0级地震活动的主要场所,研究松辽盆地地震构造和地震活动相关性是地震监测预报和抗震减灾工作重要基础性工作内容.松辽盆地是我国六大活动盆地之一.新构造运动以来以间歇性、差异性升降运动为特点的构造活动水平的差异性,反映了NE向、NNE向或SN向深大断裂.在地震预测中,通常把NW向断裂与NE或NNE向断裂交切部位视为地震多发地段和主要发震模式.我们在重磁数据的基础上确定古老的SN向和EW向断裂,特别是松辽盆地基底地震构造层内的SN向断裂或EW向断层是主要的发震与控震断裂,分析中强地震多沿SN向或EW呈线性分布特点,确定NNE向或NW向断裂与SN向或EW向断裂交切成为发震构造是东北地震区内主要发震模式.根据历史上地震的分布和区域构造体系,东北地区将来地震的发生表现为2000年以来本周期地震活跃时段已经结束,目前处于相对平静时期.在大庆—松原坳陷内细划了124°～125°和126.5°～127.0°经向地震条带,MS≥4.0级地震无一例外的归属两个条带,为预测发震构造和位置提供了可能.这些结论将为东北地区地震预测和防震抗灾提供参考.
The Songliao Basin is very important economic area of China. It is also important area where the earthquake＇s level larger than 6.0 take place. So it is significant to study the relationship of activity of earthquake and tectonic. The Songliao Basin is one of the six activity basin, where shows great different of activity, lift and down of the geological plate, and shows the deep and large faults in NE, NNE and NS. But in the earthquake prediction, the place at the cross section of NW and NE or NNE has the earthquake. We analysis the NS and EW fault （especially the under basin faults） from magnetic data and gravity data, and found high correlation of earthquake and NS or EW faults. We also divide the two areas from Daqing-Songyuan Depression, that is 124°～125° and 126.5°～127.0°, where all the earthquake larger than Ms≥4. 0 in it. This will be important conclusion for earthquake prediction in NE China.
出处
《地球物理学进展》
CSCD
北大核心
2012年第4期1337-1349,共13页
Progress in Geophysics
基金
吉林省科技厅基础研究项目(20100575)
关键词
松辽盆地
深大断裂
重磁异常
地震
地震预测
Songliao Basin, Deep and large fault, Magnetic and Gravity anomaly, earthquake, earthquake prediction.
