Japan Geoscience Union Meeting 2016

Presentation information


Symbol S (Solid Earth Sciences) » S-GD Geodesy

[S-GD22] Gravity and Geoid

Sun. May 22, 2016 3:30 PM - 5:00 PM A05 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Jun Nishijima(Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University), Yuichi Aoyama(National Institute of Polar Research), Chair:Yoshiyuki Tanaka(Earthquake Research Institute, The University of Tokyo), Yuichi Aoyama(National Institute of Polar Research)

3:30 PM - 3:45 PM

[SGD22-07] Gravitational gradient changes of mega-thrust earthquakes observed by GRACE

*Yusaku Tanaka1, Kosuke Heki1 (1.Graduate School of Science, Hokkaido University)

The earthquakes change the gravity, which means the gravitational gradient is also changed. Gravity Recovery And Climate Experiment (GRACE) have been providing insight into the gravity changes by earthquakes and the data can also be used to reveal the gravitational gradient changes. For example, Wang et al. [2012] reported gravitational gradiet changes following the 2004 Sumatra-Andaman earthquake on the GRACE CSR RL04 data. In this presentation, I will introduce the co- and postseismic gravitational gradient changes by four huge earthquakes, i.e., the 2004 Sumatra-Andaman earthquake, the 2010 Maule earthquake, the 2011 Tohoku-Oki earhquake, and the 2012 Indiean Sea earthquake observed by GRACE, comparing to the gravity changes and the gravitational gradient changes of the Tohoku-Oki earthquake observed by GOCE.