摘要
利用Q值成像和震源分布图像方法,得到了伽师地区中、上地壳的三维Q值结构和发震时间的平面图像。结果表明水平截面不同深度的Q值图像都存在低Q值带,主要展布方向为东西向、北北东向和北北西向,与研究区的柯坪断裂、羊达曼断裂和麦盖提断裂有一定的对应关系,推测低Q值带可能是研究区的几条深部断裂;垂直剖面沿77°E的条带有大面积的低Q值区,并且在这个带的两侧Q值结构有明显差异。发震时间的平面图像显示出优势取向为北北西和北东,并且相交于余震分布的密集处,这些特征是该区域的活动构造背景。为区域地质构造研究和油气资源的探测提供了深部构造信息。
Using Q-value tomography and hypocenter distribution image, the 3D Q-value structure and the seism starting time image are obtained in mid-upper crust in Jiashi seismic area. The results show on the horizontal sections at the different depth, every Q value image exists low Q value zones, main orentation is EW-striking, NNE-striking and NNW-striking, which are respectively corresponding with Keping fault, Yangdaman fault and Maigaiti fault in the study region. It is supposed that the low Q value zones are probably deep faults in study area. On the other hand, on the vertical profiles, large area of low Q value zones exist along belt of 77°E and Q value structure of two sides of this belt are obviously different. Seism starting time plane image displays that dominate orientation is NNW and NE, which intersects with the after-shock concentration area. These features are the active structural setting of this area. And it provides deep tectonic information for the geologic structure research and the petroleum resources exploration.
出处
《西南石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第3期4-6,共3页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家自然科学基金(40674043
40374032)
地震科学联合基金(104027)
中国地震局地球物理勘探中心论著RCEG200606。
关键词
三维
Q值成像
地壳深部
断裂
新疆伽师
3-D
Q value tomography
deep crust
fault
Jiashi of Xinjiang
