Hydrological triggering of the seismicity around a salt diapir in Castellane, France

Details Hydrological triggering of the seismicity around a salt diapir in Castellane, France Hydrological triggering of the seismicity around a salt diapir in Castellane, France

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010e%26psl.290...20b&link_type=abstract

Earth and Planetary Science Letters, Volume 290, Issue 1-2, p. 20-29.

Mathematics

Logic

1

Scientific paper

The subalpine belts in Provence (France) present a low level of background seismicity. However, Castellane and some surrounding villages in the middle of one of the most renown belts, the Castellane arc, have been damaged twice in a century by significant earthquakes, in 1855 and 1951. The macroseismic database acquired after these events suggests that the sources were moderate (ML ˜ 4.5) but very shallow (˜ 1 km). A recent instrumental microseismic catalogue further attests to the shallow seismicity in the area. A 58 year hydrological record of the Verdon river discharge allows us to test whether this seismicity is modulated by some transient local state-of-stress changes induced by large aquifer and artificial-lake loadings. We show that 41% of the extreme discharges (those with a probability of exceedance at 0.1%) are followed by at least one seismic event within a 7-28 day optimal interval and that this correlation, which represents 8% of the earthquakes, is not due to chance. We consider several natural and artificial hydrological mechanisms, including artificial reservoir and aquifer elastic loading and induced pore-pressure variations. We favour a model in which the local salt-gypsum domes respond to the aquifer forcing.

Affiliated with

Also associated with

No associations

Rating

Hydrological triggering of the seismicity around a salt diapir in Castellane, France does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hydrological triggering of the seismicity around a salt diapir in Castellane, France, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrological triggering of the seismicity around a salt diapir in Castellane, France will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1090515