The 16,000‐event 2003–2004 earthquake swarm in Ubaye (French Alps)
The 16,000‐event 2003–2004 earthquake swarm in Ubaye (French Alps)
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2003-2004 年乌巴耶（法国阿尔卑斯山）发生的 16,000 次地震群
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
N. Daix
中科院分区：
文献类型：
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作者：
L. Jenatton;R. Guiguet;F. Thouvenot;N. Daix
[1] The Ubaye valley, one of the most active seismic zones in the French Alps, was visited in 2003–2004 by a prolific and protracted earthquake swarm with a maximum magnitude ML = 2.7. The seismic activity clustered along a 9-km-long, 3- to 8-km-deep rupture zone which trends NW-SE across the valley and dips 80°SW. Focal mechanisms for the larger shocks show either normal faulting with a SW-NE trending extension direction or NW-SE strike slip with right lateral displacement. The activity initiated in the central part of the rupture zone, diffused to its periphery, and eventually concentrated in its southeastern deeper part. A permanent station situated above the swarm allowed us to monitor the entire phenomenon from its inception to its conclusion. The complete time series includes more than 16,000 events, with shocks down to magnitude ML = −1.3. It shows bursts of activity, separated by quiescent periods, with no well-defined subswarms as observed in other similar studies. The Gutenberg-Richter b value significantly varied between 1.0 and 1.5 in the course of the phenomenon.
