Earthquake swarms occur sporadically at divergent plate boundaries but their recurrence over multiple decades and relation to magmatic spreading activity remain poorly understood. Here we study more than 100 earthquake swarms over a 60-year period in the southern Red Sea, Afar, and Gulf of Aden region. We first compiled an earthquake-swarm catalogue by integrating reexamined global and local earthquake catalogues from 1960 to 2017. This yielded 134 earthquake swarms that mainly cluster in 19 different areas in the study region, showing that in most cases swarms recur every few decades in the same area. The swarms exhibit a range of earthquake magnitudes and often include multiple M3 to M5 events with some swarms having occasional larger earthquakes over M6, primarily in southern Afar. Many of the earthquake swarms were clearly associated with rifting events, consisting of magmatic intrusions, surface faulting, and in some cases volcanic eruptions. Together, the swarms suggest that extension at these divergent plate boundaries occurs episodically along
|Original language||English (US)|
|Journal||Frontiers in Earth Science|
|State||Published - Aug 16 2021|
Bibliographical noteKAUST Repository Item: Exported on 2021-09-29
Acknowledged KAUST grant number(s): OSR2015-CRG4-2643
Acknowledgements: We thank SO and SH for their in-depth and very constructive comments that contribute to ameliorate the quality of the paper. We also thank the Editor LL and the Field Chief Editor Valerio Acocella for the careful handling of the paper.