A5090681617- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Geological and Geochemical Analysis
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Terahertz technology and applications
- Photonic and Optical Devices
- Semiconductor materials and devices
- GNSS positioning and interference
- Semiconductor Quantum Structures and Devices
- Semiconductor Lasers and Optical Devices
- Semiconductor materials and interfaces
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Superconducting and THz Device Technology
- Geological and Geophysical Studies
- Plasmonic and Surface Plasmon Research
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Seismic Imaging and Inversion Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Orthopaedic implants and arthroplasty
- Structural Engineering and Vibration Analysis
- Landslides and related hazards
- Bone fractures and treatments
Kyoto University
2016-2025
Kyoto University of Education
2025
Prevention Institute
2013-2024
Kōchi University
2024
Tohoku University
2000-2024
Mitsubishi Heavy Industries (Japan)
2023
Hokkaido University
2009-2022
Toyota Motor Corporation (Switzerland)
2002-2021
Institute of Disaster Prevention
2014-2021
Tottori University
2020
We estimated the spatial and temporal evolution of preceding aseismic slip from January 2003 to 2011, coseismic Tohoku earthquake, postseismic after earthquake based on global positioning system (GPS) data. Time‐dependent analysis indicates offshore Miyagi Fukushima prefectures 2004 associated with a series subduction earthquakes that overlap area. These areas are centered between centers afterslip prefecture, while they off prefecture. The timing moment magnitude nine (M w 9) ‐class appears...
Slow earthquake segmentation The Japan Trench is responsible for disastrous megathrust earthquakes like the 2011 Tohoku-Oki quake. Nishikawa et al. used new observations from S-net ocean-bottom seismic network to map slow earthquakes—disturbances that do not cause ground shaking—along (see Perspective by Houston). They found area ruptured during quake was bounded areas have large numbers of earthquakes. A likely caused rupture cease, an observation important assessing risk future major...
Since November 30, 2020, an intense seismic swarm and transient deformation have been continuously observed in the Noto Peninsula, central Japan, which is a non-volcanic/geothermal area far from major plate boundaries. We modeled based on combined analysis of multiple Global Navigation Satellite System (GNSS) observation networks, including one operated by private sector company (SoftBank Corp.), relocated earthquake hypocenters, tectonic settings. Our showed total displacement pattern over...
Analysis of global positioning system data shows that the rate crustal deformations in Tokai region Japan, a seismic gap area, changed over past 18 months. Kalman filtering analysis aseismic slip on plate boundary western centered Lake Hamana, adjacent to anticipated earthquake source area. The cumulative moment magnitude reaches 6.7 June 2002 with relative increase northeast Haman from January 2002. An existence supports hypothesis silent event as cause uplifting several days before 1944...
Abstract We detected short‐term slow slip events (SSEs) previously observable only with tilt and strain data along the Nankai Trough, southwest Japan, using GNSS (Global Navigation Satellite System) data. Offsets in time series Akaike's information criterion helped automatically identify 207 episodes a motion direction opposite to that of relative plate from June 1996 January 2012. By nonlinear inversion displacement, we estimated rectangular fault models for 133 probable 25 possible SSEs...
Research Article| June 13, 2018 Development of a Slow Earthquake Database Masayuki Kano; Kano aEarthquake Institute, The University Tokyo, 1‐1‐1 Yayoi, Bunkyo‐ku, Tokyo 113‐0032, Japan, babasatoru@eri.u-tokyo.ac.jp, kano@eri.u-tokyo.ac.jp, obara@eri.u-tokyo.ac.jp, maeda@eri.u-tokyo.ac.jp, akiko-t@eri.u-tokyo.ac.jpqNow at Department Geophysics, Graduate School Science, Tohoku University, 6‐3 Aramaki Aza‐Aoba, Aoba‐ku, Sendai, Miyagi 980‐8578, Japan; masayuki.kano.a3@tohoku.ac.jp. Search for...
Abstract Using global navigation satellite system (GNSS) data to detect millimeter-order signals of short-term slow slip events (S-SSEs) and estimate their source parameters, especially duration, is challenging because low signal-to-noise ratio. Although the duration S-SSEs in Nankai subduction zone has been estimated using tiltmeters, its regional variation never quantitatively studied. We developed an S-SSE detection method both fault model with errors based on methods by previous studies...
Long-term forecast of large earthquakes is an important application earthquake science to promote preparedness people and disaster mitigation. The Earthquake Long-Term Forecast Panel was newly organized as one the program promotion panels under 2nd Volcano Hazards Observation Research Program during 2019–2023. panel has been promoting studies that advance long-term forecasts by sharing research prospects exchanging information on related topics. emphasized developing new methods based...
Temporal change of deformation in northeastern Japan is clarified by continuous Global Positioning System (GPS) observations from 1995 April to 2002 March. The observed GPS velocity approximately parallel the direction plate convergence on east and west boundaries shows post-seismic transient around source regions Mw 7.8 1993 Hokkaido-Nansei-Oki 7.7 1994 Sanriku-Haruka-Oki earthquakes. We interpret as contemporary interplate coupling subducting boundary Pacific Plate collision Amurian Plate....
In this study, short-term slow slip events (SSEs) along the Ryukyu Trench, southwestern Japan were systematically examined using continuous global navigation satellite system (GNSS) data. total, 130 probable and 93 possible SSEs in moment magnitude (M w ) range of 5.6 to 6.8 identified from January 1997 November 2013 by GNSS time series offset monitoring elastic dislocation modeling with a rectangular fault located on subducting Philippine Sea Plate. The detected found have variety...
The large displacement induced by the 2011 M 9.0 off Pacific coast of Tohoku Earthquake was observed GPS stations permanent Earth Observation Network system (GEONET) in northeastern Japan. characterized eastward and subsidence coastal area. horizontal exceeded 5.3 m, which is largest ever detected GEONET. mainshock followed a sequence aftershocks. We processed data through kinematic positioning strategy to clarify deformation, including deformation caused mainshock, with high temporal...
Southwest Japan is located in the subduction margin between continental Amurian and oceanic Philippine Sea plates. Recent land GNSS (Global Navigation Satellite System) offshore Global Positioning System-Acoustic geodetic measurements were used to clarify deformation around these plate margins. We examined strain partitioning interplate coupling using a block modeling approach on observed velocities. Although main boundaries are Nankai Trough Sagami trough, our results suggest that one-third...
Abstract The short‐period seismometer‐based magnitude saturation problem, especially for events with > 8, can be improved by a real‐time Global Navigation Satellite System (GNSS) positioning technique, which has enabled rapid estimation of finite fault model large earthquake without any saturation. A new modeling system based on the GNSS Earth Observation Network (GEONET) is developed and under experimental operation in Japan. In this paper, we present newly REGARD (the Real‐time GEONET...
The two‐dimensional displacement vector field on the Earth's surface associated with a large earthquake near Iwate volcano in Japan, was mapped by combining satellite radar interferometry images from two different track directions. reveals not only main ruptures, but details of many small faults movement aftershocks and volcanic earthquakes. displacements aftershock coincide stress reorganized that accelerated fault movements. mimic topography, suggesting repeated movements same Quaternary...
Intense crustal activity including earthquake swarms, eruptions, and a caldera formation in the northern Izu Islands started on June 26, 2000, accompanied with large deformation. Permanent GPS data reveals spatial pattern time evolution of ground The observations reveal shrinking subsidence Miyakejima extension between Kouzushima Niijima. We constructed source model to explain observed displacements during period 26 end August. consists deflation (0.12km³) beneath Miyakejima, tensile faults...
We have modeled the broad postseismic uplift measured by geodetic leveling in epicentral area of 1959 M w = 7.3 Hebgen Lake, Montana earthquake, a normal faulting event northern Basin and Range province. To fit observed we calculate synthetic deformation using relaxation response gravitational viscoelastic Earth to earthquake. For model with an elastic plate overlying half‐space, find that thickness is 38 ± 8 km, which close local crustal thickness. The half‐space viscosity estimated at 4 ×...
A novel terahertz plasma-wave photomixer that can improve the conversion gain and radiation power is proposed evaluated. The based on a high-electron mobility transistor incorporates doubly interdigitated grating strips for gate electrodes periodically localize 2D plasmons in 100-nm regions with micron-order interval. vertical cavity structure formed between top metal mirror placed at backside. device features electronic tuning of plasmon characteristic frequencies, providing...
A sequence of M 7-class interplate earthquakes and transient postseismic slips following each these occurred along the Japan Trench before occurrence giant earthquake on March 11, 2011. Continuous GPS data detected a significant deformation with displacements that were much larger than coseismic offset. Moreover, geodetic inversion results using observations revealed total moment released by was ones. This differs from our understanding process slip are smaller These processes may help us...
Background: Repair of complete radial meniscal tears is a key to restoring the mechanical integrity necessary maintain hoop tension in meniscus. The primary stability repair one most important factors for healing, but biomechanical structural properties different techniques remain unknown. Hypothesis: Our novel cross-suture technique with suturing oblique collagen fibrils meniscus will yield better fixation than standard double horizontal suture parallel Study Design: Controlled laboratory...
We present the initial results of rapid fault estimations for 2016 Kumamoto earthquake on April 16 (M j 7.3), and coseismic displacements caused by two large foreshocks that occurred 14 6.5) 15 6.4) from GEONET real-time analysis system (REGARD), which is based a Global Navigation Satellite System (GNSS) kinematic positioning technique. The finite-fault estimate w 6.85) was obtained within 1 min converged to M 6.96 5 origin time mainshock 7.3). shows right-lateral strike-slip along Futagawa...
Abstract Either the triggering of large earthquakes on a fault hosting aseismic slip or slow events (SSE) by passing seismic waves involve seismological questions with important hazard implications. Just few observations plausibly suggest that such interactions actually happen in nature. In this study we show three recent devastating Mexico are likely related to SSEs, describing cascade interacting each other regional scale via quasi-static and/or dynamic perturbations across states Guerrero...
This paper reviews recent advances in our original 2D-plasmon-resonant terahertz emitters. The structure is based on a high-electron-mobility transistor and featured with doubly interdigitated grating gates. dual gates can alternately modulate the 2D electron densities to periodically distribute plasmonic cavities along channel, acting as an antenna. device emit broadband radiation even at room temperature from self-oscillating plasmons under DC-biased conditions. When subjected laser...