摘要
为了研究震源区介质的物性特征,利用振幅谱拟合和有限差分三维Q值成像方法处理了伽师地震区临时台网的地震波形资料,获得了该地震区上地壳的S波三维Q值图像。结果表明:不同深度的Q值图像都存在低Q值带,主要展布方向为EW向、NNE向和NNW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,并且NNE向的低Q值带与强震群分布和余震分布的条带位置接近,推测低Q值带可能是震源区的几条深部断裂。
In order to investigate the properties of medium waveform data from the temporary seismostation network in the in the focal region of Jiashi earthquake, the seismic area were processed by use of the method of amplitude spectrum fitting and 3-D Q value tomography of finite difference and the S-wave＇ s Q value image of the uppercrust of the area was obtained. The results show that there is low Q belt in the Q value images of different depth, they spread in the EW, NNE and NWW directions and correspond well with the Keping, Yangdaman and Maigaiti faults. Besides, the NNE low Q belt is near to the belts in which the strong earthquake swarm and aftershokes occured. It can be infered that the low Q belts may be some deep faults in the area.
出处
《大地测量与地球动力学》
CSCD
北大核心
2006年第3期28-32,共5页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(40374032)
地震科学联合基金(104027)
关键词
三维Q值成像
伽师
强震群
地壳深部断裂
发震构造
3-D Q value tomography, Jiashi, strong earthquake swarm, deep crustal faults, seismogenic structure
