Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4655
Authors: Cirella, A.* 
Piatanesi, A.* 
Tinti, E.* 
Cocco, M.* 
Title: Rupture process of the 2007 Niigata-ken Chuetsu-oki earthquake by non-linear joint inversion of strong motion and GPS data
Journal: Geophysical Research Letters 
Series/Report no.: /35(2008)
Publisher: American Geophysical Union
Issue Date: 23-Aug-2008
DOI: 10.1029/2008GL034756
URL: http://www.agu.org/journals/gl/gl0816/2008GL034756/2008GL034756.pdf
Keywords: rupture process
inversion
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
Abstract: We image the rupture history of the 2007 Niigata-ken Chuestu-oki (Japan) earthquake by a nonlinear joint inversion of strong motion and GPS data, retrieving peak slip velocity, rupture time, rise time and slip direction. The inferred rupture model contains two asperities; a small patch near the nucleation and a larger one located 10÷15 km to the south-west. The maximum slip ranges between 2.0 and 2.5 m and the total seismic moment is 1.6×1019 Nm. The inferred rupture history is characterized by rupture acceleration and directivity effects, which are stable features of the inverted models. These features as well as the source-to-receiver geometry are discussed to interpret the high peak ground motions observed (PGA is 1200 gals) at the Kashiwazaki-Kariwa nuclear power plant (KKNPP), situated on the hanging-wall of the causative fault. Despite the evident source effects, predicted PGV underestimates the observed values at KKNPP by nearly a factor of 10.
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