title: The October 23, 2011, Van (Turkey) earthquake and its relationship with neighbouring structures.
abstract: The present work reports the analysis of a possible relationship due to stress transfer between the two earthquakes that hit the province of Van, Eastern Turkey, on October 23, 2011 (Mw = 7.2) and on November 9, 2011 (Mw = 5.6). The surface displacement field of the mainshock has been obtained through a combined data set made up of differential interferograms from COSMO-SkyMed and ENVISAT satellites, integrated with continuous GPS recordings from the Turkish TUSAGA-AKTIF network. This allowed us to retrieve the geometry and the slip distribution of the seismic source and to compute the Coulomb Failure Function (CFF) variation on the aftershock plane, in order to assess a possible causal relationship between the two events. Our results show that the November 9 earthquake could have been triggered by the October 23 shock, with transferred stress values largely exceeding 1 bar.
authors.affiliation: Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Rome, Italy.
authors.lastname: Moro M
authors.affiliation: Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Rome, Italy.
authors.lastname: Cannelli V
authors.affiliation: Centre de Recherche Public - Gabriel Lippmann, 41, rue du Brill, L-4422 Belvaux, Luxembourg.
authors.lastname: Chini M
authors.affiliation: Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Rome, Italy.
authors.lastname: Bignami C
authors.affiliation: Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Rome, Italy.
authors.lastname: Melini D
authors.affiliation: Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Rome, Italy.
authors.lastname: Stramondo S
authors.affiliation: 1] Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Rome, Italy [2] Università degli Studi di Cassino e del Lazio Meridionale, DICeM-Dipartimento di Ingegneria Civile e Meccanica, Cassino, Italy.
authors.lastname: Saroli M
authors.affiliation: Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Rome, Italy.
authors.lastname: Picchiani M
authors.affiliation: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia (USA).
authors.lastname: Kyriakopoulos C
authors.affiliation: Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143 Rome, Italy.
authors.lastname: Brunori C A