Abstract Database

CRUSTAL DEFORMATION OF THE MID NIIGATA REGION DERIVED FROM GPS MEASUREMENTS ASSOCIATED WITH THE 2004 CHUETSU, THE 2007 CHUETSU-OKI, AND THE 2011 MW 9.0 TOHOKU-OKI EARTHQUAKES

MEE11601
Rafig Safarov
Supervisor: Takeshi SAGIYA
Country: Azerbaijan
Abstractfulltext

The published F3 final daily coordinate solutions from GEONET (GPS Earth Observation Network) were analyzed to investigate the crustal deformation of the Mid Niigata (Chuetsu) region associated with the 2004 M6.8 Chuetsu, the 2007 M6.8 Chuetsu-oki, and the 2011 Mw 9.0 Tohoku-oki earthquakes. This kind of study is important to understand the effect of large earthquakes on surrounding faults, to have information about how the conditions of fault failure have been changed and eventually to progress the long-term forecast of crustal processes. High strain rates were estimated after the 2011 Tohoku-oki earthquake in the Mid Niigata region as well as in eastern Japan. We inferred that the deformation field of the Mid Niigata region is generally controlled by the west-east contraction due to the interactions between the Amurian and the Pacific plates. We found the strain redistribution in the period between the 2004 and the 2007 events. Since between the 2004 and the 2007 earthquakes significant seismic event was not observed in the Mid Niigata region, we interpreted this strain redistribution as a slow slip event with representation of a single, rectangular fault.