A5071516269- earthquake and tectonic studies
- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Landslides and related hazards
- Cryospheric studies and observations
- Geological and Geophysical Studies
- Seismic Imaging and Inversion Techniques
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- Methane Hydrates and Related Phenomena
- GNSS positioning and interference
- Geochemistry and Geologic Mapping
- Advanced Radiotherapy Techniques
- Advanced SAR Imaging Techniques
- Astrophysics and Cosmic Phenomena
- Geomagnetism and Paleomagnetism Studies
- Ionosphere and magnetosphere dynamics
- Hepatocellular Carcinoma Treatment and Prognosis
- Meteorological Phenomena and Simulations
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
The University of Tokyo
2016-2025
Association for the Development of Earthquake Prediction
2016-2025
National Research Institute for Earth Science and Disaster Resilience
2024
Earthquake Engineering Research Institute
2012-2023
Gunma Chuo Hospital
2009-2014
Saga University
2010
University of Electro-Communications
2007-2010
Lamont-Doherty Earth Observatory
2003-2004
Columbia University
2003
Stanford University
1999
Volcanic eruptions are caused by the release of pressure that has accumulated due to hot volcanic fluids at depth. Here, we show extent regions affected pressurized can be imaged through measurement their response transient stress perturbations. We used records seismic noise from Japanese Hi-net network measure crustal velocity changes below 2011 moment magnitude (M(w)) 9.0 Tohoku-Oki earthquake. interpret coseismic reductions as related mechanical weakening crust dynamic associated with...
Since 2005, we have treated hepatocellular carcinoma (HCC) with stereotactic body radiotherapy (SBRT) uniformly at two dose levels, according to baseline liver function and normal dose. We retrospectively examined the outcomes for these patients.Between 2005 2012, 221 HCC patients were SBRT. Eligibility criteria SBRT included a single (either solitary or recurrent) lesion; unfeasible, difficult refusal undergo other surgery percutaneous ablative therapies; Child-Pugh Classification (CPC) A...
The 2024 moment magnitude 7.5 Noto Peninsula (Japan) earthquake caused devastation to communities and was generated by a complex rupture process. Using space geodetic seismic observations, we have shown that the event deformed peninsula with peak uplift reaching 5 meters at west coast. Shallow slip exceeded 10 on an offshore fault. Peak stress drop greater than megapascals. This devastating began slow propagation lasting 15 20 seconds near its hypocenter, where swarms had surged since 2020...
Abstract Noise‐based crustal seismic velocity changes are known to be affected by environmental perturbations, such as rainfall, atmospheric pressure loading, and temperature changes. Similar geodetic observations, these external perturbations can mask the effects of tectonic volcanic processes. In this study, we benefit from dense Hi‐net short‐period network that covers entire Japan measure continuous in velocities over a few years, using noise‐based monitoring. Some strong seasonal...
Abstract We use 2007–2011 Advanced Land Observing Satellite (ALOS) data to perform an arc‐wide interferometric synthetic aperture radar (InSAR) time series survey of the Trans‐Mexican Volcanic Belt (TMVB) and study time‐dependent ground deformation four Indonesian volcanoes selected following 2007–2009 Chaussard Amelung (2012). Our objectives are examine whether arc exhibit long‐term edifice‐wide cyclic patterns that can be used characterize open closed volcanic systems better constrain in...
Abstract The February 2023 Turkey‐Syria Earthquake doublet ruptured multiple segments of the East Anatolian Fault (EAF) Zone. Dominating seismicity focal mechanism shifted dramatically from strike‐slip to normal‐faulting after doublet. To better understand this shift, here we derived a comprehensive 3D co‐seismic displacement field and performed stress analysis. Abundant space geodetic data were used generate high‐resolution surface displacement, which provide tight constraints on fault...
To reveal the connections between 2024 moment magnitude (
We have applied two Monte Carlo optimization techniques, simulated annealing and random cost, to the inversion of deformation data for fault magma chamber geometry. These techniques involve an element randomness that permits them escape local minima ultimately converge global minimum misfit space. tested algorithms on synthetic sets. also compared one another in terms their efficiency reliability. bootstrap method estimate confidence intervals source parameters, including correlations...
Cosmic ray muon radiography can measure the density distribution within a volcano. Unidirectional shows precise cross‐sectional view of conduit and magma body through volcano parallel to plane detector. However, it only resolves average along individual paths. Precise size shape underground structure, such as or body, provide clear pervasive information on understanding dynamics volcanic eruption. Here we show highly resolved three‐dimensional tomographic image an active Asama in Japan....
Fourier spectra of crustal guided Lg waves are collected to study seismic attenuation, or Q , along the INDEPTH profiles. The 1 Hz ( 0 ) values measured between many pairs two stations and input a back projection algorithm obtain laterally varying models. Along III profile in central Tibet, model consists low nearly constant ∼90. These consistent with abnormally high temperature as well partial melts crust. II southern Tibet increase southward. They extremely (∼60) over northernmost segment...
A visual detection and monitoring of volcanic eruptions is the most essential information. In February 2, 2009, Asama volcano, Japan erupted a large amount ash was ejected from vent. We have observed activity at since October 12, 2008. For eruption we used cosmic‐ray muon radiography (muography), new volcano system recently developed by Tanaka et al. (2009). measured quantitative mass loss inside crater during event although no changes were found below crater. The value 30,780 tons...
Time series analysis of synthetic aperture radar (SAR) and interferometric SAR generally starts with coregistration for the precise alignment stack images. Here, we introduce a model-adjusted geometrical image (MAGIC) algorithm coregistration. This corrects atmospheric propagation delays known surface motions using existing models ensures simplicity computational efficiency in data processing systems. We validate this approach by evaluating impact different geolocation errors on stacks...
Mount Fuji volcano, located 100~km away from Tokyo, directly threatens over 30~million people. It last erupted in 1707, and has remained dormant since then. Seismicity --and particularly Low-Frequency Earthquakes (LFE)-- is to now the primary indicator of processes occurring beneath volcano usually linked fluid movement. Yet, these signals are manually picked classified as such, without ability formally define them for automatic detection systems. Our goal develop an method detect...
Surface rupture caused by a strong earthquake is extremely hazardous to the safety of people’s lives. Understanding evolution mechanism co-seismic faults and assessing influence fault area propagation essential for disaster prevention resilience. Since 2000, Hualien nearby areas in eastern Taiwan have experienced 33  earthquakes, which good study rupture. In this study, we propose dynamic discrete element model explain use it analyze behavior 2024 Mw7.4 Hualian. This...
Seismic anisotropy may reveal the state of stress in crust, and its temporal changes have been attributed to deformation, seismicity, magmatic activity geothermal extraction.  We review crustal volcanic regions.  compile results test hypotheses about origin utility for monitoring unrest or production. The majority articles that were published through 2019 (~100) examined shear-wave splitting.Of 88 studies examining effects vs. structure, evenly divided between causes...
The quasi-cyclic behavior of fault zones, which encompasses interseismic, coseismic, and postseismic phases, is essential for understanding the dynamic evolution earthquakes. Examining spatiotemporal surface deformation slip distribution across different periods an earthquake cycle, obtained through geodetic techniques, enables a systematic precise models. 2020 Elaziğ 2023 Kahramanmaraş Earthquake Sequence, both occurred along East Anatolian Fault (EAF) in eastern Anatolia,...