1. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science; Tohoku University; Sendai Japan
2. Earthquake Research Institute, the University of Tokyo; Tokyo Japan
3. Department of Civil and Earth Resource Engineering, Graduate School of Engineering; Kyoto University; Kyoto Japan
4. GMuG Gesellschaft für Materialprüfung und Geophysik; Bad Nauheim Germany
5. GFZ German Research Centre for Geosciences Helmholtz Centre Potsdam; Potsdam Germany
6. Now at Japan Atomic Energy Agency; Ibaraki Japan
7. College of Science and Engineering; Ritsumeikan University; Kusatsu Japan
8. Now at Hitachi Solutions, Ltd.; Tokyo Japan