%0 Journal Article %1 terakawa_etal:2010 %A Terakawa, Toshiko %A Zoporowski, Anna %A Galvan, Boris %A Miller, Stephen A. %D 2010 %J Geology %K geophysics seismology %N 11 %P 995--998 %R 10.1130/G31457.1 %T High-pressure fluid at hypocentral depths in the L'Aquila region inferred from earthquake focal mechanisms %U http://dx.doi.org/10.1130/G31457.1 %V 38 %X We apply a new analysis technique using earthquake focal mechanisms to infer the 3-D fluid pressure field at depth in the source region of the A.D. 2009 L'Aquila earthquake/aftershock sequence. The technique, termed focal mechanism tomography, inverts for fluid pressure by examining the fault orientation relative to the regional tectonic stress pattern. We identify three large-scale pockets of high fluid pressure (up to 50 MPa above hydrostatic pressure) at depths of 7-10 km that strongly correlates with an independent data set of well-located foreshocks and aftershocks. The shape of overpressured regions and the evolution of seismicity indicate a plausible scenario that this sequence is being driven in part by the poro-elastic response of trapped reservoirs of high-pressure fluid, presumably CO2, and postseismic fluid flow initiated by the main shock.

@article{terakawa_etal:2010, abstract = {We apply a new analysis technique using earthquake focal mechanisms to infer the 3-D fluid pressure field at depth in the source region of the A.D. 2009 L'Aquila earthquake/aftershock sequence. The technique, termed focal mechanism tomography, inverts for fluid pressure by examining the fault orientation relative to the regional tectonic stress pattern. We identify three large-scale pockets of high fluid pressure (up to 50 MPa above hydrostatic pressure) at depths of 7-10 km that strongly correlates with an independent data set of well-located foreshocks and aftershocks. The shape of overpressured regions and the evolution of seismicity indicate a plausible scenario that this sequence is being driven in part by the poro-elastic response of trapped reservoirs of high-pressure fluid, presumably CO2, and postseismic fluid flow initiated by the main shock.}, added-at = {2012-09-01T13:08:21.000+0200}, author = {Terakawa, Toshiko and Zoporowski, Anna and Galvan, Boris and Miller, Stephen A.}, biburl = {https://www.bibsonomy.org/bibtex/280df84a31ff6a6fa6a2e8f9b8a1e6bb8/nilsma}, day = 1, doi = {10.1130/G31457.1}, interhash = {421e852968153bf3f4bb86bb8a7aa726}, intrahash = {80df84a31ff6a6fa6a2e8f9b8a1e6bb8}, journal = {Geology}, keywords = {geophysics seismology}, month = nov, number = 11, pages = {995--998}, timestamp = {2021-02-09T13:26:45.000+0100}, title = {High-pressure fluid at hypocentral depths in the L'Aquila region inferred from earthquake focal mechanisms}, url = {http://dx.doi.org/10.1130/G31457.1}, volume = 38, year = 2010 }