Abstract

Macroseismic and instrumental data on the January 8, 2018, Muong Ang earthquake in northwestern Vietnam are comparatively analyzed. Good agreement is found between the macroseismic and instrumental data, which in turn correlate perfectly with the tectonic data. The Muong Ang earthquake consisted of foreshocks, the mainshock, and three series of aftershocks. The first series of aftershocks occurred on the left wall of the Tuan Zao fault, at its terminus in Sha Zung, Muong Ban. Then, aftershocks gradually migrated north-northeast. Finally, aftershocks migrated south. The migration process of aftershocks not only indicates that the seismic activity is largely related to tectonic elements, but also confirms the notion that the Tuan Zao and other faults in this area are active. It can be also assumed that the Tuan Zao fault extends rather far south to the area of Chieng Sho, instead of terminating in Sha Zung and Muong Ban, as shown on modern tectonic maps.

中文翻译：

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2018年1月8日越南西北部孟昂地震的特征

摘要

对越南西北部的孟昂地震（2018年1月8日）的宏观地震和仪器数据进行了比较分析。在宏观地震和仪器数据之间找到了很好的一致性，这反过来又与构造数据完美相关。孟昂地震包括前震，主震和三个系列余震。第一系列余震发生在团班断层的左墙，位于孟板沙宗的终点。然后，余震逐渐迁移到东北东北部。最终，余震向南迁移。余震的迁移过程不仅表明地震活动与构造要素有很大关系，而且还证实了该地区的团早等断裂带是活跃的。