Attenuation Relationship Characteristics of Ground Motions for Deep-focus Earthquakes around the Ogasawara Islands, Japan

Large-scale broadband simulation of strong ground motions from recent and historical damaging Earthquakes in Japan

A recent development of the Earth Simulator super parallel computer has made it possible to realized realistic 3-D simulations of high-frequency seismic wave propagations on a regional scale. Paralleling this development, the deployment of dense networks of strong ground motion instruments in Japan (K-NET and KiK-net) has now made it possible to directly visualize regional seismic wave propagat...

Parallel simulation of strong ground motions during recent and historical damaging earthquakes in Tokyo, Japan

The development of high-performance computing facilities such as the Earth Simulator supercomputer and the deployment of dense networks of strong ground motion instruments in Japan (K-NET and KiK-net) have made it possible to directly visualize regional seismic wave propagation during large earthquakes. Our group has developed an efficient parallel finite difference method (FDM) code for modeli...

The Flora of the Bonin (Ogasawara) Islands

Large-scale parallel simulation of seismic wave propagation and strong ground motions for the past and future earthquakes in Japan

Large-scale parallel finite-difference method (FDM) simulations of seismic wave propagation have been conducted using the Earth Simulator in order to clarify the complex seismic wavefield resulting from heterogeneities in structures and the source rupture process during the Hyogo-ken Nanbu (Kobe) earthquake (Mj 7.2; Mw 6.9) in 1995. High-resolution simulation using 240 nodes (1920 processing el...

Possible seasonality in large deep-focus earthquakes

Large deep-focus earthquakes (magnitude> 7.0, depth> 500 km) have exhibited strong seasonality in their occurrence times since the beginning of global earthquake catalogs. Of 60 such events from 1900 to the present, 42 have occurred in the middle half of each year. The seasonality appears strongest in the northwest Pacific subduction zones and weakest in the Tonga region. Taken at face value, t...