141 research outputs found
Sequence of deep-focus earthquakes beneath the Bonin Islands identified by the NIED nationwide dense seismic networks Hi-net and F-net
Study of Small-scale Heterogeneities in the Earth Inferred from Analysis of Observed and Simulated Seismograms
Synthesizing sea surface height change including seismic waves and tsunami using a dynamic rupture scenario of anticipated Nankai trough earthquakes
The development of offshore observation technology will provide researchers with tsunami records from within an earthquake focal area, but this will create new problems. Because seismic waves coexist with tsunami inside a focal area, the seismic waves could act as noise for the tsunami signal. This study shows an efficient method to calculate sea surface height change caused by an earthquake including both seismic waves and tsunami. Simulation results indicate that seismic waves overlap with tsunami; both affect the change in sea surface height although most previous tsunami studies have neglected the contribution of seismic waves. We also numerically simulated the sea-surface displacement wavefield and hypothesized results for an anticipated rupture scenario of a huge earthquake that may possibly occur in the Nankai Trough, Japan. The synthesized record could be used to evaluate the performance of a real-time tsunami prediction method. Additionally, we discussed the similarity and difference between two kinds of tsunami waveforms: the displacement of the sea surface and the pressure change at the sea bottom. Although seismic waves appeared in both waveforms, the contribution of seismic waves was lower in the displacement at the sea surface than in the pressure change at the sea bottom
Strong seismic wave scattering in the low-velocity anomaly associated with subduction of oceanic plate
High-frequency seismic wave propagation within the heterogeneous crust: Effects of seismic scattering and intrinsic attenuation on ground motion modelling
Scattering of high-frequency seismic waves caused by irregular surface topography and small-scale velocity inhomogeneity
Distorion of the apparent radiation pattern in the High-frequency wavefield: Tottori-ken Seibu, Japan, Earthquake of 2000
Velocity increase in the uppermost oceanic crust of subducting Philippine Sea plate beneath the Kanto region due to dehydration inferred from high-frequency trapped P waves
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