A5032675056- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Geophysics and Sensor Technology
- Planetary Science and Exploration
- Earthquake Detection and Analysis
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geological and Geophysical Studies
- Geophysics and Gravity Measurements
- Space Exploration and Technology
- Meteorological Phenomena and Simulations
- Landslides and related hazards
- Geophysical Methods and Applications
- Seismic Performance and Analysis
- Underwater Vehicles and Communication Systems
- Geology and Paleoclimatology Research
- History and Developments in Astronomy
- Reservoir Engineering and Simulation Methods
- Inertial Sensor and Navigation
- Ultrasonics and Acoustic Wave Propagation
- Structural Health Monitoring Techniques
- Nuclear Physics and Applications
- Underwater Acoustics Research
Australian National University
2020-2024
California Institute of Technology
2015-2022
Sandia National Laboratories
2018
Abstract Debris flows are concentrated slurries of water and sediment that shape the landscape pose a major hazard to human life infrastructure. Seismic ground motion‐based observations promise provide new, remote constraints on debris flow physics, but lack data theoretical basis for interpreting them hinders progress. Here we present new mechanistic physical model seismic motion apply this devastating in Montecito, California 9 January 2018. The amplitude frequency characteristics can...
Abstract Strong waveform complexities, including multipathing of the S diffracted phase and rapid changes in differential ScS‐S times, are observed for multiple deep Fiji earthquakes recorded at USArray. The complexities occur northeastern edge Pacific Large Low Shear Velocity Province (LLSVP), about 12 degrees southeast present‐day Hawaiʻi. Waveform modeling provides good constraints on an ultra‐low velocity zone (ULVZ) with a width 5 degree located near inner LLSVP. Based...
Abstract At the core‐mantle boundary, most observed ultralow velocity zones (ULVZs) cluster along edges of large low shear provinces (LLSVPs) and provide key information on composition, dynamics, evolution lower mantle. However, their detailed structure near slab‐like structures beneath mid‐Pacific remains particularly challenging because lack station coverage. While studies ULVZs concentrate SKS‐complexity, here we report multipathing ScS, which expands sampling for ULVZs. We find strongest...
Abstract With increasing geophysical applications using distributed acoustic sensing (DAS) technology, there is a need to implement metadata standard specifically for DAS facilitate the integration of measurements across experiments and increase reusability. We propose intended primarily research community, which fully describes five key components experiment: (1) interrogator; (2) data acquisition; (3) channels; (4) cable; (5) fiber. The proposed schema, overall structure metadata,...
The Geysers geothermal field is one of the most seismically active regions in northern California.Most events occur at shallow depths and are related to stress hydrological perturbations due energy production operations.To better understand relationships between seismicity operations, source mechanism information needed.Seismic moment tensors offer insight into nature equivalent forces causing seismicity.Fifty-three M >3 located were selected from University California Berkeley Moment Tensor...
Abstract We conducted an experiment in Pahrump, Nevada, June 2017, where artificial seismic signals were created using a hammer, and the possibility of detecting them from their acoustic signature was examined. In this work, we analyze pressure recorded by highly sensitive barometers deployed on ground tethers suspended balloons. Our signal processing results show that wind noise experienced barometer free‐flying balloon is lower compared to one moored balloon. This has never been...
Seismology on Venus has long eluded planetary scientists due to extreme temperature and pressure conditions its surface, which most electronics cannot withstand for mission durations required ground-based seismic studies. We show that infrasonic (low-frequency) fluctuations, generated as a result of ground motion, produced by an artificial source known hammer, recorded using sensitive microbarometers deployed tethered balloon, are able replicate the frequency content motion. also weak,...
Abstract During February 2023, a total of 32 individual distributed acoustic sensing (DAS) systems acted jointly as global seismic monitoring network. The aim this Global DAS Month campaign was to coordinate diverse network organizations, instruments, and file formats gain knowledge move toward the next generation earthquake networks. campaign, 156 earthquakes magnitude 5 or larger were reported by U.S. Geological Survey contributors shared data for 60 min after each event’s origin time....
SUMMARY In the immediate vicinity of a source, there are strong gradients in seismic wavefield that tamed and modified distributed acoustic sensing (DAS) recording due to combined effects gauge-length averaging local stacking on strain field. Close source broadside propagation significant, produce characteristic impact DAS channels. presence topography, surface or cable, additional introduced modify expected signal. All these influences mean results tap tests used calibrate channel positions...
Abstract Ground motions in the Los Angeles Basin during large earthquakes are modulated by earthquake ruptures, path effects into basin, basin effects, and local site response. We analyzed direct effect of shallow structures on shaking duration at a period 2–10 s region through modeling small magnitude, shallow, deep pairs. The source depth modulates response, particularly duration, these features function not condition. Three‐dimensional simulations using CVM‐S4.26.M01 velocity model show...
Abstract The mechanical coupling between solid planets and their atmospheres enables seismically induced acoustic waves to propagate in the atmosphere. We numerically simulate this coupled system for two application cases: active seismic experiments (ASEs) passive experiments. A recent ASE (Krishnamoorthy et al., 2018, https://doi.org/10.1002/2018GL077481 ) observed infrasonic signals produced by a hammer. To measure sensitivity of observations parameters, we attempt reproduce results from...
Abstract Characterizing the large M4.7+ seismic events during 2018 Kīlauea eruption is important to understand complex subsurface deformation at summit. The first 12 (May 17–May 26) are associated with long‐duration signals and remaining 50 29–August 2) accompanied by large‐scale caldera collapses. Resolving source location mechanism challenging because of shallow depth, significant nondouble‐couple components, velocity structure. We demonstrate that combining multiple geophysical data from...
Abstract Recent advances in sensing technologies, particularly Distributed Acoustic Sensing (DAS), have significantly improved the collection and analysis of seismological data. DAS is a powerful method for detecting vibrations from various sources, including earthquakes. However, vast amount data produced by requires sophisticated analytical methods to differentiate between signals interest noise, such as traffic signals. We introduce an innovative approach extending Noise2Self framework...
Abstract Distributed acoustic sensing (DAS) offers a cost effective, nonintrusive method for high-resolution near-surface characterization in urban environments where conventional geophysical surveys are limited or nonexistent. However, passive imaging with DAS settings presents challenges such as strong diurnal traffic noise, nonlinear array geometry, and poor fiber coupling to the ground. We repurposed dark Melbourne, Australia, into 25 km that traces busy arterial roads, tram routes,...
In the immediate vicinity of a source there are strong gradients in seismic wavefield that tamed and modified DAS recording due to combined effects gauge-length averaging local stacking on strain field. Close broadside propagation significant produce characteristic impact channels. presence topography, surface or cable, additional introduced modify expected signal. All these influences mean results tap tests used calibrate channel positions along cable may give distorted view actual...
Abstract Distributed acoustic sensing (DAS) is positioned to revolutionize observational seismology by providing dense spatial sampling and temporal resolution. DAS repurposes long sections (1–10s of kilometers) fiber-optic cable into thousands individual sensors at meter spacing uses light measure the ground motion as seismic waves pass through fiber. The South Island Seismology Speed Light experiment involved acquisition data from two dark telecommunication fibers along highway near Haast,...
As part of a global distributed acoustic sensing (DAS) campaign, multiple DAS interrogators (from academia and industry) recorded simultaneously from 1st till 28th February 2023 in different regions the globe. The objective is to define if how monitoring system based on could perform for teleseismic event record analysis. Each participant uploaded triggered data window earthquakes with magnitude larger than 5, as defined by seismological networks, central storage location. Data was...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Solid Earth. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing an older version [v1]Go new versionInflation Asymmetric Collapse Kilauea Summit during the 2018 Eruption from Seismic Infrasound AnalysesAuthorsVoon...