A5006808443- earthquake and tectonic studies
- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Seismology and Earthquake Studies
- Seismic Imaging and Inversion Techniques
- Geological and Geochemical Analysis
- Seismic Performance and Analysis
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Geological Modeling and Analysis
- Geophysical Methods and Applications
- Hydraulic Fracturing and Reservoir Analysis
- Disaster Response and Management
- Wind Energy Research and Development
- Climate change and permafrost
- Geotechnical and Geomechanical Engineering
- Earthquake and Tsunami Effects
- Energy Load and Power Forecasting
- Wind Turbine Control Systems
- Atomic and Subatomic Physics Research
- Rock Mechanics and Modeling
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- Drilling and Well Engineering
Northeast Forestry University
2025
Planetary Science Institute
2015-2024
University of California, Los Angeles
2015-2024
City University of Macau
2024
UCLA Health
2022-2023
University of California, Santa Cruz
2019
Hebei University of Science and Technology
2017
Nanjing University
2008-2015
California Institute of Technology
2011-2012
Geophysical observations from the 2011 moment magnitude (M(w)) 9.0 Tohoku-Oki, Japan earthquake allow exploration of a rare large event along subduction megathrust. Models for this indicate that distribution coseismic fault slip exceeded 50 meters in places. Sources high-frequency seismic waves delineate edges deepest portions and do not simply correlate with locations peak slip. Relative to M(w) 8.8 2010 Maule, Chile earthquake, Tohoku-Oki was deficient radiation--a difference we attribute...
[1] The 2011 Mw 9 Tohoku-Oki earthquake, recorded by over 1000 near-field stations and multiple large-aperture arrays, is far the best earthquake in history of seismology provides unique opportunities to address fundamental issues source dynamics. Here we conduct a high resolution array analysis based on recordings from USarray European network. mutually consistent results both arrays reveal rupture complexity with unprecedented resolution, involving phases diverse speed intermittent...
Seismological observations of the 2012 moment magnitude 8.6 Sumatra earthquake reveal unprecedented complexity dynamic rupture. The surprisingly large results from combination deep extent, high stress drop, and rupture multiple faults. Back-projection source imaging indicates that occurred on distinct planes in an orthogonal conjugate fault system, with relatively slow speed. east-southeast-west-northwest ruptures add a new dimension to seismotectonics Wharton Basin, which was previously...
Abstract Large earthquakes often do not occur on a simple planar fault but involve rupture of multiple geometrically complex faults. The 2016 M w 7.8 Kaikoura earthquake, New Zealand, involved the at least 21 faults, propagating from southwest to northeast for about 180 km. Here we combine space geodesy and seismology techniques study subsurface geometry, slip distribution, kinematics rupture. Our finite‐fault model indicates that motion changes predominantly right‐lateral near epicenter...
On 14 August 2021, the moment magnitude ( M w ) 7.2 Nippes earthquake in Haiti occurred within same fault zone as its devastating 2010 7.0 predecessor, but struck country when field access was limited by insecurity and conventional seismometers from national network were inoperative. A of citizen installed 2019 provided near-field data critical to rapidly understand mechanism mainshock monitor aftershock sequence. Their real-time defined two clusters that coincide with areas coseismic slip...
Abstract On February 6, 2023, an Mw7.8 earthquake hit the East Anatolian Fault (EAF) and Narlı (NF), followed by Mw7.5 event on Sürgü Fault. We combine multiple seismic datasets, global navigation satellite system recordings, radar images with finite fault inversion slowness enhanced back-projection to study rupture kinematics. Our analysis reveals that originated NF, propagating 120 km northeast at 3.05 km/s 200 southwest 3.11 after reaching EAF junction, exhibiting overall subshear speeds....
To reveal the connections between 2024 moment magnitude (
Abstract The 2015 M w 7.8 Nepal‐Gorkha earthquake with casualties of over 9000 people was the most devastating disaster to strike Nepal since 1934 Nepal‐Bihar earthquake. Its rupture process imaged by teleseismic back projections (BP) seismograms recorded three, large regional networks in Australia, North America, and Europe. source images all three arrays reveal a unilateral eastward rupture; however, propagation directions speeds differ significantly between arrays. To understand spatial...
A catastrophic M w 7 earthquake ruptured on 12 January 2010 a complex fault system near Port‐au‐Prince, Haiti. Offshore rupture is suggested by aftershock locations and marine geophysics studies, but its extent remains difficult to define using geodetic teleseismic observations. Here we perform the multitaper multiple signal classification (MUSIC) analysis, high‐resolution array technique, at regional distance with recordings from Venezuela National Seismic Network resolve high‐frequency...
The 2013 M8.3 Okhotsk earthquake involves two primary mechanisms of deep-focus rupture, mineral phase transformation olivine to spinel and thermal shear instability. Backprojection imaging broadband seismograms recorded by the North American European networks indicates bilateral rupture toward NE SSE. paths segment other regional M7 earthquakes are confined in narrow regions along slab contours, consistent with mechanism. However, SSE propagates a long distance across aftershocks distributed...
Abstract We combine aftershock relocations, source mechanisms, teleseismic P wave backprojection, and Global Positioning System data inversion to constrain complex faulting geometry of the 2018 M W 7.9 offshore Kodiak earthquake. Relocated aftershocks delineate several N‐S trends including a prominent 110‐km‐long segment, as well broad NE‐SW trends. modeling backprojection indicate that trending left‐lateral strike‐slip segments released most energy dominating far‐field crustal deformation...
Abstract The back projection method is a tremendously powerful technique for investigating the time dependent earthquake source, but its physical interpretation elusive. We investigate how rupture heterogeneity and directivity can affect back‐projection results (imaged location beam power) using synthetic models. Rather than attempting to model dynamics of any specific real earthquake, we use idealized kinematic models, with constant or varying velocity, peak slip rate, fault‐local strike...
The soluble solids content (SSC) of blueberry is a key index for evaluating its quality. In view the demand rapid non-destructive testing SSC and shortcomings existing single-variety models in cross-variety applications, universal prediction model construction method based on hyperspectral imaging (HSI) technology proposed this study. spectral data three varieties were obtained by using 935∼1720 nm system. A partial least squares regression (PLSR) was constructed combining different...
We present a 2D dynamic rupture model that provides physical interpretation of the key features 2011 Tohoku-Oki earthquake rupture. This minimalistic assumes linear slip-weakening friction, presence deep asperities and depth-dependent initial stresses. It reproduces first-order observations along-dip process during its 100 s, such as large static slip low-frequency radiation up-dip from hypocenter, slow punctuated by high-frequency in deeper regions. also derive quantitative constraints on...
Comparing teleseismic array back-projection source images of the 2011 Tohoku-Oki earthquake with results from static and kinematic finite inversions has revealed little overlap between regions high- low-frequency slip. Motivated by this interesting observation, studies extended to intermediate frequencies, down about 0.1 Hz, have suggested that a progressive transition rupture properties as function frequency is observable. Here, adapting concept response non-stationary signals, we...