OS41B-03
Variations in seismicity within Lucky Strike volcano (37°17’N MAR) from 2007-2015, from a seafloor seismometer network
Thursday, 17 December 2015: 08:30
3009 (Moscone West)
Wayne C Crawford1, Mathilde Cannat1, Javier Escartin2, Christian Baillard1,3 and Romuald Daniel4, (1)Institut de Physique du Globe de Paris, Paris, France, (2)CNRS, Paris Cedex 16, France, (3)Ecole Normale Supérieure Paris, Paris, France, (4)IPGP & CNRS, Paris Cedex 05, France
Abstract:
A 5-station, 8 km aperture seafloor seismological network operates on Lucky Strike volcano (EMSO-Azores observatory) since 2007, using yearly rotations of the stations. The first two years of data revealed that most of the volcanic seismicity was generated by cooling at the interface between hydrothermal circulation cells and hot rock above the axial magma chamber (Crawford et al., 2013, EPSL). We present here the full 8-year seismicity catalog, highlighting variability in hydrothermal-based seismicity and the existence and implications of other seismic sources within the volcano. We also interpret three years of broadband seismological data collected at the site, including variability in subsurface shear velocities indicated by seafloor compliance.
