TITLE:
Coseismic Effects of the 2011 Magnitude 9.0 Tohoku-Oki Earthquake Measured at Far East Russia Continental Coast by Gravity and GPS Methods
AUTHORS:
Vladimir Timofeev, Ruslan Kulinich, Maxim Valitov, Yuri Stus, Eugeniy Kalish, Bernard Ducarme, Pavel Gornov, Dmitriy Ardyukov, Igor Sizikov, Anton Timofeev, Gulshat Gil’manova, Tatyana Kolpashikova, Zoya Proshkina
KEYWORDS:
Absolute Gravimetry; GPS; Tidal Gravity Modeling and Observation; Scintrex Gravimeter; Co-Seismic Effect for Tohoku-Oki Earthquake
JOURNAL NAME:
International Journal of Geosciences,
Vol.4 No.2,
March
29,
2013
ABSTRACT: This work presents the results of complex gravity observation performed at Shults Cape, Gamov peninsula (42.58°N, 131.15°E), Russia. Absolute laser gravimeter GABL type and Scintrex type relative gravimeter were used for measurement. To investigate the accuracy of tidal corrections we compared the observed tidal parameters of the main tidal waves O1 and M2 with modeled ones computed from 6 different ocean tidal models: CSR4, FES02, FES04, GOT00, NAO99 and TPX06. After discussion a theoretical model based on TPX06 ocean tides model and DDW99 non hydrostatic body tides model was used for tidal correction of absolute gravity data. Preliminary estimate of gravity effect induced by the Tohoku-Oki earthquake of11 March 2011Mw = 9.0 at Primorye territory (Russia) was found to be 5.1 ± 2.0 μGal. Co-seismic crustal displacements revealed by GPS data at Far EastRussiacontinental coast are also investigated. Volumetric dilatation of this area is observed at +1.7 × 10-8 level.