Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 14, 849-859, 2014
https://doi.org/10.5194/nhess-14-849-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
14 Apr 2014
A statistical feature of anomalous seismic activity prior to large shallow earthquakes in Japan revealed by the pattern informatics method
M. Kawamura1, Y.-H. Wu2, T. Kudo3, and C.-c. Chen2 1Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan
2Department of Earth Sciences and Graduate Institute of Geophysics, National Central University, Jhongli, Taoyuan 32001, Taiwan
3General Education Division, College of Engineering, Chubu University, Kasugai, Aichi 487-0027, Japan
Abstract. To reveal the preparatory processes of large inland earthquakes, we systematically applied the pattern informatics (PI) method to earthquake data of Japan. We focused on 12 large earthquakes with magnitudes greater than M = 6.4 (based on the magnitude scale of the Japan Meteorological Agency) that occurred at depths shallower than 30 km between 2000 and 2010. We examined the relationship between the spatiotemporal locations of these large shallow earthquakes and the locations of PI hotspots, which correspond to grid cells of anomalous seismic activity during a designated time span. Based on a statistical test conducted using Molchan's error diagram, we investigated whether precursory anomalous seismic activity occurred in association with these large earthquakes and, if so, studied the characteristic time spans of such activity. Our results indicate that Japanese inland earthquakes with M ≥ 6.4 are typically preceded by anomalous seismic activity in timescales of 8–10 years.

Citation: Kawamura, M., Wu, Y.-H., Kudo, T., and Chen, C.-c.: A statistical feature of anomalous seismic activity prior to large shallow earthquakes in Japan revealed by the pattern informatics method, Nat. Hazards Earth Syst. Sci., 14, 849-859, https://doi.org/10.5194/nhess-14-849-2014, 2014.
Publications Copernicus
Download
Share