文章基本信息

标题：Repeating earthquakes and ground deformation reveal the structure and triggering mechanisms of the Pernicana fault, Mt. Etna
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作者：Andrea Cannata ; Adriana Iozzia ; Salvatore Alparone 等
期刊名称：Communications Earth & Environment
电子版ISSN：2662-4435
出版年度：2021
卷号：2
期号：1
页码：1-11
DOI：10.1038/s43247-021-00188-6
语种：English
出版社：Nature Research
摘要：Structure and dynamics of fault systems can be investigated using repeating earthquakes as repeatable seismic sources, alongside ground deformation measurements. Here we utilise a dataset of repeating earthquakes which occurred between 2000 and 2019 along the transtensive Pernicana fault system on the northeast flank of Mount Etna, Italy, to investigate the fault structure, as well as the triggering mechanisms of the seismicity. By grouping the repeating earthquakes into families and integrating the seismic data with GPS measurements of ground deformation, we identify four distinct portions of the fault. Each portion shows a different behaviour in terms of seismicity, repeating earthquakes and ground deformation, which we attribute to structural differences including a segmentation of the fault plane at depth. The recurrence intervals of repeating earthquake families display a low degree of regularity which suggests an episodic triggering mechanism, such as magma intrusion, rather than displacement under a constant stress. Repeating earthquakes display variable behaviour across distinct portions of the Pernicana fault system, Mt. Etna, indicating structural differences and episodic triggering, according to a 20 year earthquake dataset, and GPS ground deformation measurements.