EVENT PLACE: UFAZ Small Conference Hall (room 101)
EVENT DATE: May 3, 2019
EVENT TIME: 4:30 p.m.
Imaging and monitoring deep geothermal reservoir with ambient seismic noise
Ambient seismic noise is an improper term used to qualify the continuous ground vibrations recorded by seismometers apart from deterministic signals produced by localized sources (earthquake, explosion, …). It originates from various phenomena at the earth surface such as ocean swells, atmospheric effect, human activity, … Long considered as a limiting factor for standard seismological techniques, it has been demonstrated a few years ago that by correlating ambient noise records at pair of stations, one can simulate "virtual" seismic sources. Nowadays, this approach is experiencing a significant expansion in seismology and is widely applied to study the Earth structure and dynamics at different scales and in different contexts.
Following an introduction to this new seismic probing technique, this presentation will focus on its applicability, potentials, and limitations, for the imaging and monitoring of deep geothermal reservoirs. This will be illustrated through various studies performed at EOST-Strasbourg in Northern Alsace (France) around the deep geothermal sites of Soultz-sous-Forêts and Ritterhoffen and based on datasets acquired from either permanent or temporary seismic networks.