利用地方震出格记录尾波测定宁夏北部及邻区Q值

Q ESTIMATES IN THE NORTH OF NINGXIA AND ITS NEIGHBOURHOOD with THE CODA OF OVERLOADED RECORD OF LOCAL EARTHQUAKES

摘要:

基于安艺的尾波理论,本文提出了一种使用单台记录的出格地震图尾波资料测定地壳上层介质Q值的新方法。利用该方法,对宁夏北部地区(38°-41.5°,104°-107°)测定了其Q值的分布。结果指出,宁夏吴忠到石咀山之间的银川地堑的Q值(100-200)明显偏低于与其接邻的内蒙阿拉善左旗和磴口一带的Q值(200-300),在个别局部区城存在Q值异常区。最后简要讨论了所得结果。

Abstract:

On the basis of Akis theory of coda, this paper develops a new method to estimate Q-Value for the upper crust medium with the coda data of the overload seismogram recorded by single station with this method, and distributions of Q-value in North Ningxia(38°-41.5N, 104°-107°E)are determined. The results point out that Q-value in Yin Chuan graden between Wuzhong and shizuishan(Q-value 100-200)is clearly lower than that in neighbouring Alashanzuo Banner and Dengko(Q-value: 200-300), and there are anomalous regions of Q-valne in the partial zomes. Finally, the obtained results are discussed.