Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9782
Authors: Romano, F.* 
Molinari, I.* 
Lorito, S.* 
Piatanesi, A.* 
Title: Source of the 6 February 2013 Mw 8.0 Santa Cruz Islands Tsunami
Journal: Natural Hazards and Earth System Sciences (NHESS) 
Series/Report no.: /15 (2015)
Publisher: Copernicus GmbH
Issue Date: 2015
DOI: 10.5194/nhessd-3-1949-2015
Keywords: Subduction zone
Tsunami
Inverse problem
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes 
05. General::05.01. Computational geophysics::05.01.03. Inverse methods 
Abstract: On 6 February 2013 an Mw 8.0 subduction earthquake occurred close to Santa Cruz Islands at the transition between the Solomon and the New Hebrides Trench. The ensuing tsunami caused significant inundation on the closest Nendo Island. The seismic source was studied with teleseismic broadband P waves inversion optimized with tsunami forward modeling at DART buoys (Lay et al., 2013), and with inversion of teleseismic body and surface waves (Hayes et al., 2014). The two studies also use different hypocenters and different planar fault models, and found quite different slip models. In particular, Hayes et al. (2014) argued for an aseismic slip patch SE from the hypocenter. We here develop a 3D model of the fault surface from seismicity analysis and retrieve the tsunami source by inverting DART and tide-gauge data. Our tsunami source model features a main slip patch (peak value of ~11 m) SE of the hypocentre, and reaching the trench. The rake direction is consistent with the progressively more oblique plate convergence towards the Solomon trench. The tsunami source partially overlaps the hypothesized aseismic slip area, which then might have slipped coseismically.
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