Kyoto University · Engineering
Professor Toshiki Watanabe's research lab specializes in advanced seismic imaging and inverse modeling techniques, with a focus on high-resolution subsurface characterization using time-lapse and full-waveform seismic data. The lab develops innovative methods such as Fresnel volume-based tomography and frequency-domain viscoacoustic inversion to improve the accuracy of velocity and attenuation imaging. Additionally, the lab explores the interplay between microstructural evolution and mechanical properties in materials, particularly through in-situ nanoscale imaging of crack propagation and interfacial behavior in composites. The group also investigates solid-state battery interfaces, aiming to understand and control lithium dendrite formation through electrolyte doping and interfacial engineering.
Figures are computed from collected data and may differ slightly.
PreviousNext No AccessSEG Technical Program Expanded Abstracts 1999Seismic traveltime tomography using Fresnel volume approachAuthors: Toshiki WatanabeToshifumi MatsuokaYuzuru AshidaToshiki WatanabeKyoto University, Japan, Toshifumi MatsuokaKyoto University, Japan, and Yuzuru AshidaKyoto University, Japanhttps://doi.org/10.1190/1.1820777 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Permalink: https://doi.org/10.1
To detect the change of physical properties in small areas, a series of high‐resolution waveform inversions is applied to time‐lapse seismic data. A procedure by use of differentiation between the time‐lapse data and normalization using reference data is proposed in this study. The procedure is derived as a straight‐forward extension of waveform inversion as the scatterer imaging. Through numerical tests, the proposed approach was found to be more accurate than the conventional approach in obtai
The crack initiation and propagation under the application of opening load were analyzed in situ using nondestructive synchrotron radiation X-ray computed tomography (nanoscopic SR X-CT) with a spatial resolution of ~50 nm. The results show that the voids and cracks initiation are not only the result of local stresses but also are due to two competing nanoscale mechanisms, that is, fiber/plastic interface debonding and in-resin crack initiation. In the “thin” epoxy region in which the resin thic
All-solid-state lithium batteries that use lithium metal as the anode have extremely high energy densities. However, for lithium metal anodes to be used, lithium dendrite formation must be addressed. Recently, the addition of lithium iodide (LiI) to sulfide solid electrolytes was found to suppress lithium dendrite formation. It is unclear whether the cause of this suppression is the improvement of the ionic conductivity of the solid electrolyte itself or the electrochemical properties of the lit
This study investigates the performance of a frequency domain viscoacoustic full wave form nonlinear inversion to obtain high resolution images of velocity and attenuation. An efficient frequency domain implementation is applied that consists of performing a series of single frequency inversions sweeping from low to high frequency. A cascaded inversion was adopted in which the real part of the velocity is first imaged using the phase information, then the quality factor (Q) is imaged using the a
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