The Saurashtra horst in the Gujarat state is an intraplate region located in the westernmost part of India, bounded by three failed rifts, namely Kachchh, Cambay, and Narmada. The region is prone to swarm type of seismic activity, mostly occurring after an intense summer monsoon. In this study, the focal mechanism of earthquakes occurring in the Saurashtra region has been investigated. The earthquakes are clustered in two groups, one in the northern part near the Jamnagar region and the other in the southern part near the Talala region. The focal mechanism of 29 earthquakes were determined with 16 in the Jamnagar region and 13 in the Talala region. The magnitude range of these earthquakes is 3.1–5.1. It is found that the Jamnagar region located in the northern part is characterized by reverse faulting and the Talala region located in the southern part is characterized by strike-slip faulting. The focal mechanisms obtained are inverted to find out the present-day stress field in the Saurashtra horst. It is observed that the Jamnagar and the Talala regions are dominated by radial compression and transtension regimes, respectively. The source parameters of some of these earthquakes from the strong motion data are also estimated. It is found that the stress drop of earthquakes in this region is in the range 9–69 bars, lower than the adjacent Kachchh rift. The average stress drop of the strike-slip earthquakes is found to be more than the reverse mechanism earthquakes, which agrees with the observation in the adjacent Kachchh rift. It is also observed from the data set that the stress drop of the earthquakes in the Saurashtra is dependent on the earthquake size and independent of the focal depth.

古吉拉特邦的索拉什特拉地幔是位于印度最西部的一个板块内区域，以三个失败的裂谷为界，即 Kachchh、Cambay 和 Narmada。该地区容易发生群型地震活动，主要发生在强烈的夏季风之后。在这项研究中，研究了发生在索拉什特拉地区的地震的震源机制。地震分为两组，一组位于靠近贾姆讷格尔地区的北部，另一组位于靠近塔拉拉地区的南部。确定了 29 次地震的震源机制，其中贾姆讷格尔地区 16 次，塔拉拉地区 13 次。这些地震的震级范围为 3.1-5.1。发现位于北部的Jamnagar地区以逆断层为特征，位于南部的Talala地区以走滑断裂为特征。将获得的震源机制倒置以找出索拉什特拉地垒中的当今应力场。据观察，Jamnagar 和 Talala 地区分别以径向压缩和横张方式为主。还根据强震数据估计了其中一些地震的震源参数。发现该地区地震应力降在9~69 bar，低于邻近的Kachchh裂谷。发现走滑地震的平均应力降大于逆向机制地震，这与邻近的 Kachchh 裂谷的观测结果一致。