Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-GI General Geosciences, Information Geosciences & Simulations

[M-GI33] Data-driven geosciences

Mon. May 27, 2019 3:30 PM - 5:00 PM A08 (TOKYO BAY MAKUHARI HALL)

convener:Tatsu Kuwatani(Japan Agency for Marine-Earth Science and Technology), Hiromichi Nagao(Earthquake Research Institute, The University of Tokyo), Kenta Ueki(Japan Agency for Marine-Earth Science and Technology), Masayuki Kano(Graduate school of science, Tohoku University), Chairperson:Tatsu Kuwatani(JAMSTEC), Suguru Yabe(JAMSTEC)

4:45 PM - 5:00 PM

[MGI33-10] Characteristic patterns and minimal dynamics of correlated seismicity in Japanese island region

*mitsuhiro toriumi1 (1.Japan agency of marine science and technology )

Keywords:spatio-temporal variation of seismicity, correlated seismicity time series, minimal non-linear dynamics

The seismicity rates in this study are defined as the seismic event numbers of the given volume having one degree of longitude and 2.5 degree of latitude from the surface to 30 km depth and 30 to 660km depth in the Japanese islands region. It shows that the characteristic trends of time series of strongly correlated seismicity are possibly obtained as transformed seismicity rates by SVD; the one shows the long term change, second does the periodic time series with various periodicity involving annual variation, and third does nearly Gaussian noise. The first two types of time series can be mapped as five clusters in the diagram of newly transformed seismicity rate coordinates, suggesting existence of stable nodes with annual oscilation and gaussian noises. From these stable nodes, it concludes that the minimal dynamics of the seismicity of the Japanese island region is approximated as the simple low dimensional nonlinear dynamics with semi-periodic variable as is similar to van del Pol equation.