We analyze dominant sources identified in a catalog of more than 156,000 localizations performed using a 26-days dataset recorded by a dense array set on the San Jacinto fault near Anza, in California. Events were localized using an array processing technique called Match Field Processing. As for all array processing techniques, the quality of the event position decrease when the events are outside of the array. We thus separate localizations in and outside the array using simple geometrical conditions. We compare the time distribution of the localization to additional data such as meteorological data, day of human activity as well as existing catalogs to determine the nature of the dominant events located using our method. We find that most of the events located outside of the array could be attributed to a surface structure excited by wind. On the other hand, part of the localizations under the array occur during regional earthquakes and could correspond to diffraction on the fault's heterogeneities. The rest of the localizations inside the array could be generated by the fault itself.

中文翻译：

---

San Jacinto断层带浅层地震源的密集阵列数据表征

我们分析了使用26天数据集进行的超过156,000个本地化目录中的主要来源，这些数据集是由位于加利福尼亚州安扎附近的San Jacinto断层上的密集阵列所记录的。使用称为“匹配字段处理”的数组处理技术对事件进行了本地化。对于所有数组处理技术，事件在数组外部时，事件位置的质量会降低。因此，我们使用简单的几何条件将阵列内外的定位分开。我们将本地化的时间分布与其他数据（例如气象数据，人类活动日以及现有目录）进行比较，以确定使用我们的方法确定的主要事件的性质。我们发现，位于阵列外部的大多数事件都可以归因于风激发的表面结构。另一方面，阵列下方的局部化发生在区域地震期间，可能对应于断层非均质性的衍射。阵列内部的其余局部化可由故障本身生成。