eprintid: 1925
rev_number: 10
eprint_status: archive
userid: 2
dir: disk0/00/00/19/25
datestamp: 2017-05-15 12:36:16
lastmod: 2017-06-27 09:51:36
status_changed: 2017-05-15 12:36:16
type: article
metadata_visibility: show
creators_name: Grasso, Jean-Robert
creators_name: Wittlinger, G.
corp_creators: Laboratoire de Geophysique Interne et Tectonophysique Observatoire de Grenoble Université Joseph Fourier, France
corp_creators: Laboratoire de Sismologie Institut de Physique du Globe, France
title: Ten years of seismic monitoring over a gas field
subjects: MP2
subjects: MP4
subjects: RF2
subjects: SHC
divisions: IP2
full_text_status: none
abstract: Ten years of seismic recording allows us to locate more than 800 tremors with magnitudes ranging from 1.0 to 4.2, in a small (10 by 10 by 5 km) volume near a major gas field (Lacq, France). The seismic activity began 10 yr after gas extraction began. Nearly all of the epicenters are located within the lateral extent of the gas field. The only perturbation of the stress or strain fields, which has the same spatial and temporal scale as the seismicity, is the 500-bar drop in gas pressure due to 20 yr of gas exploitation, demonstrating that these events are induced. The network, established to monitor this activity, consists of eight telemetered stations including a well-bottom geophone located at 3200 m depth. Using three-dimensional relocation techniques, we computed new hypocenter positions for more than 280 events. These better-located hypocenters form a diffuse zone that mimics the local dome structure. Taking the regional tectonic stresses into account, we suggest that these ruptures may be the result of unfolding of the dome structure.
date: 1990-04
date_type: published
publication: Bulletin of the Seismological Society of America
volume: 80
number: 2
publisher: Seismological Society of America
pagerange: 450-473
issn: 0037-1106
official_url: http://www.bssaonline.org/content/80/2/450.abstract
access_IS-EPOS: unlimited
owner: Publisher
citation:   Grasso, Jean-Robert and Wittlinger, G.  (1990) Ten years of seismic monitoring over a gas field.  Bulletin of the Seismological Society of America, 80 (2).  pp. 450-473.