We determined earthquake locations through re-picking of P- and S-wave arrival times recorded by BMKG network. Earthquake locations were determined using Hypoellipse code that employs a single event determination method. We then relocated the events using hypocenter double-difference method. We also conducted focal mechanism analysis to estimate the type of fault slip. The results indicate improved hypocenter locations, where patterns of seismicity in West Java were delineated clearly. There are several clusters of earthquakes at depths ≤ 30 km, which are probably related to the Cimandiri, Lembang, and Baribis faults. In addition, there is another cluster in Garut trending southwest-northeast, which is possibly related to a local fault. Histograms of travel-time residuals depict good results, in which travel-time residuals are mostly close to zero. Source mechanism throughout the Lembang fault indicates a left-lateral strike slip in agreement with previous studies. The Cimandiri fault also shows a left-lateral slip, but in the south it shows a thrust fault mechanism. While the source mechanisms of the western part of the Baribis fault indicate a thrust fault and the cluster of events in Garut shows a right-lateral slip if they are related to a local fault.

中文翻译：

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基于地震震源确定，重新定位和震源机制分析，确定印度尼西亚西爪哇省的活动断层

我们通过重新挑选BMKG网络记录的P波和S波到达时间来确定地震位置。使用单事件确定方法的Hypoellipse代码确定地震的位置。然后，我们使用震源双差法重新定位了事件。我们还进行了震源机制分析，以估计断层滑动的类型。结果表明震中位置得到了改善，在西爪哇省的地震活动模式被清晰地描绘出来了。在深度≤30 km处有几组地震，可能与Cimandiri，Lembang和Baribis断层有关。另外，在牙律中还有另一个向西南偏东北方向发展的集群，这可能与局部断层有关。行程时间残差的直方图描述了良好的结果，其中行程时间残差大多接近零。整个Lembang断层的震源机制表明左旋走滑与先前的研究一致。Cimandiri断层也显示出左旋滑动，但在南部显示出逆冲断层机制。巴里比斯断层西部的震源机制表明是逆冲断层，而格鲁特的事件簇如果与局部断层有关，则显示出右旋滑动。