Anomalies in wide seismicity before the 2011 Tohoku Earthquake
Abstract
Application of the ETAS model with changepoint detected that the seismicity all over the Tohoku district, inland and offshore included, have changed statistically significantly during the period from the year 2000 to 2006. This work updates the preceding work by Kumazawa et al. [2010] by the dataset with the longer period extended up until the occurrence time of Tohoku-Oki earthquake of M9.0: March 11, 2011. Kumazawa et al. [2010] detected significant and systematic seismicity changes that occurred during 2003—2005 over wide regions in and around Tohoku District. They associated these changes with the local precursory slips before the 2008 Iwate-Miyagi Nairiku earthquake. With the accumulated earthquake dataset and in association with the GNSS geodedic records, however, those seismicity changes are more adequately explained by much larger crustal deformation caused by transident slow slips on the plate boundary offshore of the east coast of Tohoku District.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.S41E0590K
- Keywords:
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- 7209 Earthquake dynamics;
- SEISMOLOGYDE: 7223 Earthquake interaction;
- forecasting;
- and prediction;
- SEISMOLOGYDE: 7230 Seismicity and tectonics;
- SEISMOLOGYDE: 7240 Subduction zones;
- SEISMOLOGY