Rupture process of the 2007 Niigata-ken Chuetsu-oki earthquake by non-linear joint inversion of strong motion and GPS data
Article first published online: 23 AUG 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 16, August 2008
How to Cite
2008), Rupture process of the 2007 Niigata-ken Chuetsu-oki earthquake by non-linear joint inversion of strong motion and GPS data, Geophys. Res. Lett., 35, L16306, doi:10.1029/2008GL034756., , , and (
- Issue published online: 23 AUG 2008
- Article first published online: 23 AUG 2008
- Manuscript Accepted: 16 JUL 2008
- Manuscript Revised: 10 JUL 2008
- Manuscript Received: 21 MAY 2008
- source model;
- 2007 Niigata-ken Chusetsu-oki earthquake;
- nonlinear inversion
 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.