A5011283507- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- High-pressure geophysics and materials
- Methane Hydrates and Related Phenomena
- Geological and Geophysical Studies
- Landslides and related hazards
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Mechanical Failure Analysis and Simulation
- Reservoir Engineering and Simulation Methods
- Geomagnetism and Paleomagnetism Studies
- Engineering Structural Analysis Methods
- Urban and Rural Development Challenges
- Disaster Management and Resilience
- Underwater Acoustics Research
- Flood Risk Assessment and Management
- Rock Mechanics and Modeling
- Geotechnical and Geomechanical Engineering
- Groundwater and Isotope Geochemistry
- Data-Driven Disease Surveillance
Chinese University of Hong Kong
2020-2025
Institute of Seismological Research
2024
University of Washington
2024
Carnegie Institution for Science
2022
Lamont-Doherty Earth Observatory
2016-2021
Columbia University
2014-2021
Stanford University
2020
Los Alamos National Laboratory
2018
Oceanography Society
2018
California Institute of Technology
2007
Abstract The 2016–2017 central Italy seismic sequence occurred on an 80 km long normal-fault system. initiated with the Mw 6.0 Amatrice event 24 August 2016, followed by 5.9 Visso 26 October and 6.5 Norcia 30 October. We analyze continuous data from a dense network of 139 stations to build high-precision catalog ∼900,000 earthquakes spanning 1 yr period, based arrival times derived using deep-neural-network-based picker. Our contains order magnitude more events than routinely produced local...
Volcano monitoring goes into the deep Axial Seamount is a large and active submarine volcano along Juan de Fuca midocean ridge off coast of western United States. Eruptions in 1998 2011 were followed by periods magma recharge, making it an ideal location to include Ocean Observatories Initiative Cabled Array. Wilcock et al. present real-time seismic data from most recent eruption April 2015 that allow tracking before during eruption. Nooner Chadwick show eruptions are predictable on basis...
Abstract Volcanic regions commonly host swarms comprising small to moderate-sized earthquakes while tectonic faults mostly mainshock-aftershock sequences that can include very large earthquakes. In the southeastern Tibetan Plateau, formed by collision between Indian and Eurasian plates intersect with intraplate Tengchong volcanic field, seismic behavior of such an environment remains unclear. Here, we built a deep-learning-based high-precision earthquake catalog for field found (1) ~59%...
Abstract While earthquakes are well-known to trigger surface hazards and initiate hazard cascades, whether can instead remains underexplored. In 2018, two landslides on the Tibetan plateau created landslide-dammed lakes which subsequently breached caused catastrophic outburst floods. Here we build an earthquake catalog using machine-learning cross-correlation-based methods shows there was a statistically significant increase in activity (local magnitude ≤ 2.6) as lake approached peak water...
Abstract The strong tidal triggering of mid-ocean ridge earthquakes has remained unexplained because the occur preferentially during low tide, when normal faulting should be inhibited. Using Axial Volcano on Juan de Fuca as an example, we show that axial magma chamber inflates/deflates in response to stresses, producing Coulomb stresses faults are opposite sign those produced by tides. When chamber’s bulk modulus is sufficiently low, phase inverted. We find stress dependence seismicity rate...
Abstract Both volcano‐tectonic (VTs) and deep long‐period earthquakes (DLPs) have been documented at Akutan Volcano, Alaska may reflect different active processes helpful for eruption forecasting. In this study, we perform high‐resolution earthquake detection, classification, relocation using seismic data from 2005 to 2017 investigate their relationship with underlying magmatic processes. We find that the 2,787 VTs 787 DLPs are concentrated above below inferred magma reservoir respectively....
Abstract Surface hazards can form hazard cascades which expand their reach. However, our understanding of complex dynamics and ability to mitigate impacts remain limited. In 2018, two landslides dammed the Jinsha River in Tibetan plateau formed landslide‐dammed lakes. Subsequent dam breaches prompted evacuation >120,000 people. An early warning system for floods using a regional seismic network has been proposed on basis catastrophic having detected ∼100 km away, with energy proportional...
Seismic hazard assessment and risk mitigation depend critically on rapid analysis characterization of earthquake sequences. Increasing seismicity in shale gas blocks the Sichuan Basin, China, has presented a serious challenge to monitoring managing itself. In this study, detect events we apply machine-learning-based phase picker (PhaseNet) continuous seismic data collected between November 2015 2016 from temporary network covering Weiyuan Shale Gas Blocks (SGB). Both P- S-phases are picked...
We developed a new technique of inverting short-period (0.5-2 Hz) P waveforms for determining small earthquake (M Ͻ3.5) focal mechanisms and moments, where magnitude ϳ4 events with known source are used to calibrate the "unmodeled" structural effect.The calibration is based on waveform cluster analysis, we show that clustered different sizes, example, M versus ϳ2, display similar signals in (SP, 0.5-2 frequency band, implying propagational stability.Since both ϳ2 have corner frequencies...
Strain accumulated on the deep extension of some faults is episodically released during transient slow-slip events, which can subsequently load shallow seismogenic region. At San Andreas fault, characteristics events are difficult to constrain geodetically due their small deformation signal. Slow-slip (SSEs) often accompanied by coincident tremor bursts composed many low-frequency earthquakes. Here, we probabilistically estimate spatiotemporal clustering properties earthquakes detected along...
Abstract The application of deep‐learning‐based seismic phase pickers has surged in recent years. However, the efficacy these models when applied to monitoring volcano seismicity yet be fully evaluated. Here, we first compile a data set waveforms from various volcanoes globally. We then show that performances two widely used deep‐learning deteriorate systematically as earthquakes' frequency content decreases. Therefore, are especially poor for long‐period earthquakes often associated with...
Abstract Seven three‐component ocean bottom seismometers (OBS) of the Ocean Observatories Initiative (OOI) Cabled Array on top Axial Seamount are continuously streaming data in real time to Incorporated Research Institutions for Seismology (IRIS). The OBS array records earthquakes from submarine volcano which last erupted 24 April 2015, about 4 months after came online. have proven crucial providing insight into structure and dynamics (Wilcock et al., 2016,...
Abstract The protracted nature of the 2016-2017 central Italy seismic sequence, with multiple damaging earthquakes spaced over months, presented serious challenges for duty seismologists and emergency managers as they assimilated growing sequence to advise local population. Uncertainty concerning where when it was safe occupy vulnerable structures highlighted need timely delivery scientifically based understanding evolving hazard risk. Seismic assessment during complex sequences depends...
Abstract Studies have found that earthquake timing often correlates with tides at mid‐ocean ridges and some terrestrial settings. also suggested tidal triggering may preferentially happen when a region is critically stressed, making it potential tool to forecast earthquakes volcanic eruptions. We examine of ∼100,000 microearthquakes near 9°50'N East Pacific Rise recorded between October 2003 January 2007, which encompasses an eruption in 2006. This allows us look how signal varies over cycle...
Abstract On 24 September 2019, an Mw 5.9 earthquake struck near the Mangla reservoir in northeastern Pakistan and resulted 39 fatalities 746 serious injuries, making it deadliest region since 2005 7.6 Kashmir earthquake. Here, we integrate geodetic, seismic, field observations to characterize source properties impact of Mirpur as well investigate whether might be a reservoir-induced event. From inverting Interferometric Synthetic Aperture Radar data, find that fault with strike ∼310°, dip...
Research Article| January 24, 2018 What Googling Trends Tell Us about Public Interest in Earthquakes Yen Joe Tan; Tan aLamont‐Doherty Earth Observatory, Columbia University, 61 Route 9 West, P.O. Box 1000, Palisades, New York 10964 U.S.A., yjt@ldeo.columbia.edu Search for other works by this author on: GSW Google Scholar Rijan Maharjan bDepartment of Mechanical Engineering and Materials Science, Yale Hillhouse Avenue, M11, Haven, Connecticut 06520 rijan.maharjan@yale.edu Seismological...
Research Article| February 13, 2019 Using Machine Learning to Discern Eruption in Noisy Environments: A Case Study CO2‐Driven Cold‐Water Geyser Chimayó, New Mexico Baichuan Yuan; Yuan aDepartment of Mathematics, University California Los Angeles, 520 Portola Plaza, 90095 U.S.A. Search for other works by this author on: GSW Google Scholar Yen Joe Tan; Tan bDepartment Earth and Environmental Sciences, Columbia University, 303F Oceanography, 61 Route 9W ‐ PO Box 1000, Palisades, York 10964‐8000...
Abstract Our ability to comprehend the underlying mechanisms of dynamic earthquake triggering (DET) is often hindered due a lack concurrent static stress and pore-pressure change observations. Here, we utilize known reservoir-induced seismicity near Pertusillo Reservoir in southern Italy as natural experiment track how changes pore pressure from hydrological operations are related DET around reservoir. A ∼13-month (May 2005–June 2006) high-resolution catalog utilized compute rate for...
Seismicity at active volcanoes provides crucial constraints on the dynamics of magma systems and complex fault activation processes preceding during an eruption. We characterize time-dependent spectral features volcanic earthquakes Axial Seamount with unsupervised machine learning methods, revealing mixed frequency signals that emerge from continuous waveforms about 15 hours before eruption onset. The events migrate along pre-existing fissures, suggesting they represent brittle crack opening...