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Scaling of early afterslip velocity and possible detection of tsunami-induced subsidence by GPS measurements immediately after the 2011 Tohoku-Oki earthquake
| Title: | Scaling of early afterslip velocity and possible detection of tsunami-induced subsidence by GPS measurements immediately after the 2011 Tohoku-Oki earthquake |
| Authors: | Mitsui, Y. Browse this author →KAKEN DB | | Heki, K. Browse this author →KAKEN DB |
| Keywords: | Satellite geodesy | | Transient deformation | | Tsunamis | | Earthquake dynamics | | Subduction zone processes |
| Issue Date: | Jun-2013 |
| Publisher: | Oxford University Press |
| Journal Title: | Geophysical Journal International |
| Volume: | 195 |
| Start Page: | 238 |
| End Page: | 248 |
| Publisher DOI: | 10.1093/gji/ggt256 |
| Abstract: | We explore the use of on-land GPS observations to detect deformation due to tsunami propagation near source regions of large interplate earthquakes. Here, we focus on the Mw 9 Tohoku-oki earthquake, which occurred around 14:46 (JST) on 2011 March 11. We consider GPS data in the time span 14:54–15:22 (JST) along the Sanriku coast, where the tsunami had the largest amplitude. The displacement data shows the signatures of large aftershocks as well as post-seismic fault slip (afterslip). These effects are particularly evident in the east component. From the horizontal displacement vectors, we construct a simple fault model for the early phase of the afterslip. Mean slip velocity of the early afterslip reaches 0.1 mm s−1. By compiling the early afterslip velocity of recent interplate earthquakes around that region, we find its increasing trend with the main shock magnitude. This scaling relation may reflect higher stressing rates at edges of larger main shock faults. Separately,we forward calculate land deformation due to tsunami height changes based on a tsunami simulation. Tsunami-induced deformation is only evident in the vertical direction at coastal GPS stations. The predicted subsidence amounts at some coastal stations can account for a large portion of the residuals between the observation and the modelled deformation due to the fault slip. |
| Rights: | This article has been accepted for publication in Geophysical Journal International ©:The Authors 2013 Published by Oxford University Press on behalf of The Royal Astronomical Society All rights reserved. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/53158 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 日置 幸介
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