A5037677315- earthquake and tectonic studies
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Geological and Geochemical Analysis
- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Data Mining Algorithms and Applications
- Advanced Computational Techniques and Applications
- Anomaly Detection Techniques and Applications
- Video Surveillance and Tracking Methods
- Geophysics and Sensor Technology
- Access Control and Trust
- Geological and Geophysical Studies
- Service-Oriented Architecture and Web Services
- Gait Recognition and Analysis
- Flow Measurement and Analysis
- Health and Medical Studies
- Ideological and Political Education
- Urban Agriculture and Sustainability
- Embedded Systems and FPGA Design
- Cloud Data Security Solutions
- Urban Green Space and Health
- Infectious Encephalopathies and Encephalitis
- Value Engineering and Management
Baotou Medical College
2024
The University of Texas at Austin
2024
University of California, San Diego
2023-2024
Scripps Institution of Oceanography
2023-2024
UC San Diego Health System
2023
California Institute of Technology
2019-2022
Xi'an University of Science and Technology
2012-2022
Hebei Science and Technology Department
2021
Nanjing University of Science and Technology
2021
University of Science and Technology of China
2013-2018
Many ruptures across many scales The period of seismic quiescence in Southern California was rudely interrupted by the Ridgecrest earthquake sequence July 2019. Ross et al. mapped slip sequences during magnitude 6.4 and 7.1 earthquakes that shook region. They found a few larger, but smaller, faults occurred both earthquakes. calls for rethinking hazard, as multifault are not usually considered when assessing risk. Science , this issue p. 346
The destructive 2023 moment magnitude (Mw) 7.8-7.7 earthquake doublet ruptured multiple segments of the East Anatolian Fault system in Turkey. We integrated multiscale seismic and space-geodetic observations with multifault kinematic inversions dynamic rupture modeling to unravel events' complex history stress-mediated fault interactions. Our analysis reveals three subshear slip episodes during initial Mw 7.8 a delayed initiation southwest. 7.7 event occurred 9 hours later larger supershear...
We present a machine-learning approach to classifying the phases of surface wave dispersion curves. Standard FTAN analysis surfaces observed on an array receivers is converted image, which, each pixel classified as fundamental mode, first overtone, or noise. use convolutional neural network (U-net) architecture with supervised learning objective and incorporate transfer learning. The training initially performed synthetic data learn coarse structure, followed by fine-tuning using...
Abstract We determined the rupture sequence of 12 August 2021 M w 8.2 South Sandwich Island earthquake which appears to be a complex in both time and space. Notable tsunamis were recorded by tide gauges at global distances. Given complexity this event, we conducted multiple subevent inversion on broadband seismograms, resolve its variations fault geometry, location, depth, temporal characteristics. found that initiated as regular deep thrust earthquake; it then ruptured shallower triggered...
Subduction zones host the majority of global earthquakes, from shallow megathrust and outer-rise to deep intraplate earthquakes. Although it is well established that subducting slabs are primary energy source for most quantitative relationship between slab dynamics seismic events remains poorly understood. In this study, we develop a comprehensive 3D geodynamic model Izu-Bonin-Mariana subduction system connect long-term with earthquake activity. Our comparison modeled stress state...
Abstract In this study, we investigate the shallow shear wave velocity structure of Los Angeles Basin in southern California, using ambient noise correlations between 5 dense arrays and 21 broadband stations from Southern California Seismic Network (SCSN). We observe clear fundamental mode first overtone Rayleigh waves frequency band 0.25–2.0 Hz, obtain group maps through tomography. further derive a 3D model, covering large portion central LA for depths shallower than 3 km. found that small...
Research Article| January 28, 2015 CAPjoint, A Computer Software Package for Joint Inversion of Moderate Earthquake Source Parameters with Local and Teleseismic Waveforms Weiwen Chen; Chen aNational Geophysical Observatory at Mengcheng, School Earth Space Sciences, University Science Technology China, Hefei 230026, China Search other works by this author on: GSW Google Scholar Sidao Ni; Ni bState Key Laboratory Geodesy Earth's Dynamics, Institute Geophysics, Chinese Academy Wuhan 430077,...
Abstract The 2019 Ridgecrest M w 6.4 and 7.1 earthquakes ruptured a complex fault system, posing challenges in understanding their physical processes. Modeling of the ruptures relies on geometries at depth, which are usually assumed based surface traces aftershocks. Here we use seismic geodetic data to jointly constrain slip distributions. We first represent first‐order rupture processes with series subevents, then conduct inversions subevent‐guided geometries. find that foreshock...
The January 1st, 2024, moment magnitude (Mw) 7.5 Noto Peninsula earthquake ruptured in complex ways, challenging timely analysis of the tsunami generation. We present rapid and accurate models informed by a 6-subevent centroid tensor (CMT) model that we obtain inverting teleseismic strong motion data validation against geodetic observations. identify two distinct bilateral rupture episodes, including six subevents re-nucleation episode at its hypocenter 20 seconds after initiation, likely...
Abstract The 1 January 2024, moment magnitude 7.5 Noto Peninsula earthquake ruptured in complex ways, challenging analysis of its tsunami generation. We present models informed by a 6‐subevent centroid tensor (CMT) model obtained through Bayesian inversion teleseismic and strong motion data. identify two distinct bilateral rupture episodes. Initial, onshore toward the southwest is followed delayed re‐nucleation at hypocenter, likely aided fault weakening, causing significant seafloor uplift...
Pertussis (or whooping cough) has experienced a global resurgence despite widespread vaccine efforts. In China, the incidence of pertussis rapidly increased, particularly following COVID-19 pandemic. Whole-genome sequencing analysis was performed on 60 Bordetella strains isolated in Beijing from 2020 to 2023, and sequences were compared with those 635 China 943 other countries. this study, genetic evolution B. investigated, focusing key virulence genes (ptxP, ptxA, prn, fim2, fim3, tcfA)...
SUMMARY Moment tensors are key to seismic discrimination but often require accurate Green's functions for estimation. This limits the regions, frequency bands and wave types in moment tensor inversions. In this study, we propose a differential inversion (diffMT) method that uses relative measurements remove path effects shared by clustered events, thereby improving accuracy of source parameters. Using results from regular inversions as priori distribution, apply Bayesian Markov Chain Monte...
Land surface temperature (LST) data in the thermal infrared (TIR) band measured by Moderate-resolution Imaging Spectroradiometer (MODIS) instrument are critical for studying urban heat islands (SUHIs); however, these acquired TIR LST contaminated clouds, so it is crucial to develop a method generate cloud-free products. In this paper, employing Tianjin as research area, we combined Weather Research and Forecasting (WRF) model with random forest (RF) spatial optimization algorithm propose...
The cold Fiji-Tonga subduction zone accounts for >75% of cataloged deep earthquakes but none the largest ten in last century. On 19 August 2018 and 06 September 2018, a earthquake doublet with moment magnitude (Mw) 8.2 7.9 struck Fiji area, providing rare opportunity to interrogate behaviors great slabs. By cursory examination, rupture dimensions aftershocks are similar 1994 Bolivia Mw warm slab, instead 2013 Okhotsk 8.3 event slab. This appears contradict traditional view that slab...
Database as a Service (DaaS) is common service mode in Cloud Computing. Based on Feldman (t,n) VSS protocol and ElGamal homomorphism property, we proposed privacy-preserving access control for DaaS. Using Secret Sharing, can protect the security of data owner's dataset, based requester's query combining with proxy servers' strategy, requesters obtain results when they have enough permission. Theoretical analysis shows that without Trust Third Party, hide information, while protecting both...
Earthquake rupture directivity impacts ground motions and provides important insights on fault zone properties earthquake physics. However, measuring of small earthquakes is challenging due to their compact sizes complex path site effects at high frequencies. Here, we develop a new approach that deconvolves energy envelopes the S-coda waves remove robustly resolve azimuthal variations in apparent source-time functions. Our method benefits from coherence for high-frequency seismic data, which...