Imbricated Aseismic Slip and Fluid Diffusion Drive a Seismic Swarm in the Corinth Gulf, Greece

被引:84
作者
De Barros, Louis [1 ]
Cappa, Frederic [1 ,2 ]
Deschamps, Anne [1 ]
Dublanehet, Pierre [3 ]
机构
[1] Univ Cote dAzur, Observ Cote dAzur, Geoazur, CNRS,IRD, Sophia Antipolis, France
[2] Inst Univ France, Paris, France
[3] PSL Res Univ, MINES ParisTech, Paris, France
关键词
seismic swarm; aseismic slip; repeaters; seismic migration; fluid diffusion; Corinth Gulf; EARTHQUAKE SWARM; SOURCE PARAMETERS; STRESS TRANSFER; FAULT SLIP; RIFT; INJECTION; DEFORMATION; EVOLUTION; SPECTRA;
D O I
10.1029/2020GL087142
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The primary processes driving seismic swarms are still under debate. Here, we study the temporal evolution of a seismic swarm that occurred over a 10-day period in October 2015 in the extensional rift of the Corinth Gulf (Greece) using high-resolution earthquakes relocations. The seismicity radially migrates on a normal fault at a fluid diffusion velocity (similar to 125 m/day). However, this migration occurs intermittently, with periods of fast expansion (2 to 10 km/day) during short seismic bursts alternating with quiescent periods. Moreover, the growing phases of the swarm illuminate a high number of repeaters. The swarm migration is likely the results of a combination of multiple driving processes. Fluid upflow in the fault may induce aseismic slip episodes, separated by phases of fluid pressure build-up. The stress perturbation due to aseismic slip may activate small asperities that produce bursts of seismicity during the most intense phases of the swarm.
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页数:9
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