不同定位方法对江苏高邮M4.9地震震源深度的测定

Focal Depth Determination of the Gaoyou M4.9 Earthquake by Different Positioning Methods

摘要:

2012年7月20日20时11分江苏高邮与宝应交界处发生M4.9地震，该地震是近年来江苏陆地发生的震级最大、影响最大的地震。通过对sPn与Pn地震波走时差方程推导，计算出此次地震的震源深度为15 km，双差定位计算深度结果为17 km，江苏台网编目结果为17 km，不同定位方法得出的结果均比较接近，分析认为此次主震震源深度在15~17 km较为可信。

Abstract:

The M4.9 earthquake which occurred at 20:11 in July 20, 2012, at the junction of Gaoyou and Baoying in Jiangsu Province is the largest and the most influential earthquake in Jiangsu in recent years. Based on the travel time difference equation of sPn and Pn waves, we calculate the focal depth of the M4.9 earthquake as 15 km, and the calculated depth by both double-difference location and Jiangsu network catalog is 17 km. The different location results are very close; thus, we believe that the focal depth of main shock is about 15-17 km.