Ambient noise multimode surface wave tomography

K Nishida, R Takagi, A Takeo - Progress in Earth and Planetary Science, 2024 - Springer
Seismic techniques using earthquakes are powerful tools for exploring the Earth's internal
structure. However, the earthquake distribution limits the spatial resolution. In recent years …

Extraction of mantle discontinuities from teleseismic body‐wave microseisms

S Kato, K Nishida - Geophysical Research Letters, 2023 - Wiley Online Library
Ocean swell activities excite body‐wave microseisms that contain information on the Earth's
internal structure. Although seismic interferometry is feasible for exploring structures, it faces …

Short‐term and long‐term variations in seismic velocity at shallow depths of the overriding plate west of the Japan Trench

T Tonegawa, R Takagi, K Sawazaki… - Journal of Geophysical …, 2023 - Wiley Online Library
Long‐term and short‐term temporal variations in seismic velocity have been investigated
using seismic interferometry, and significant short‐term changes are typically recognized as …

Multimode dispersion measurement of surface waves extracted by multicomponent ambient noise cross-correlation functions

R Takagi, K Nishida - Geophysical Journal International, 2022 - academic.oup.com
Cross-correlation functions of ambient seismic noise sometimes show multimode
characteristics of surface waves, especially in observations in sedimentary areas and ocean …

High-frequency S and S-coda waves at ocean-bottom seismometers

S Takemura, K Emoto, L Yamaya - earth, planets and space, 2023 - Springer
To clarify the characteristics of high-frequency (> 1 Hz) S and S-coda waves at ocean-bottom
seismometers (OBSs), we analyzed seismograms observed at permanent OBSs and inland …

Improving the Constraint on the Mw 7.1 2016 Off‐Fukushima Shallow Normal‐Faulting Earthquake With the High Azimuthal Coverage Tsunami Data From the S‐Net …

T Kubota, H Kubo, K Yoshida… - Journal of …, 2021 - Wiley Online Library
Tsunamis with amplitudes of up to 40 cm, related to the Mw 7.1 normal‐faulting earthquake
off Fukushima, Japan, on November 21, 2016, were clearly recorded by a new offshore wide …

[HTML][HTML] Seismic anisotropy and geodynamics of the East Japan subduction zone

D Zhao, J Wang, Z Huang, X Liu, Z Wang - Journal of Geodynamics, 2023 - Elsevier
Seismic anisotropy in the East Japan arc has been extensively investigated by conducting
shear-wave splitting measurements, receiver-function analyses, and tomographic inversions …

Receiver function imaging of the amphibious NE japan subduction zone—Effects of low‐velocity sediment layer

HJ Kim, H Kawakatsu, T Akuhara… - Journal of …, 2021 - Wiley Online Library
This study presents reflectivity images of the northeast (NE) Japan subduction zone
continuous across the ocean and land. As nearly half of its forearc region is under the …

Comparison of methods for coupled earthquake and tsunami modelling

LS Abrahams, L Krenz, EM Dunham… - Geophysical Journal …, 2023 - academic.oup.com
Tsunami generation by offshore earthquakes is a problem of scientific interest and practical
relevance, and one that requires numerical modelling for data interpretation and hazard …

Detailed S-wave velocity structure of sediment and crust off Sanriku, Japan by a new analysis method for distributed acoustic sensing data using a seafloor cable and …

S Fukushima, M Shinohara, K Nishida, A Takeo… - Earth, Planets and …, 2022 - Springer
The S-wave velocity (V s) structure of sediments and the uppermost crust in the landward
slope of a subduction zone are important for determining the dynamics of the overriding …