A5001553926- GNSS positioning and interference
- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Seismic Waves and Analysis
- Inertial Sensor and Navigation
- Advanced Computational Techniques and Applications
- Indoor and Outdoor Localization Technologies
- Advanced Frequency and Time Standards
- Geological and Geophysical Studies
- Geological and Geophysical Studies Worldwide
- Astronomical Observations and Instrumentation
- High-pressure geophysics and materials
- Soil Moisture and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Seismic Imaging and Inversion Techniques
- Archaeological and Historical Studies
- Marine and environmental studies
- Fault Detection and Control Systems
- Seismic Performance and Analysis
- Ionosphere and magnetosphere dynamics
- Underwater Acoustics Research
- Natural Language Processing Techniques
- Environmental Monitoring and Data Management
Central Washington University
2004-2025
Abstract The Geodesy Advancing Geosciences and EarthScope (GAGE) Facility Global Positioning System (GPS) Data Analysis Centers produce position time series, velocities, other parameters for approximately 2000 continuously operating GPS receivers spanning a quadrant of Earth's surface encompassing the high Arctic, North America, Caribbean. purpose this review is to document methodology generating station positions their evolution over describe requisite trade‐offs involved with combination...
Research Article| June 08, 2016 Demonstration of the Cascadia G‐FAST Geodetic Earthquake Early Warning System for Nisqually, Washington, Brendan W. Crowell; Crowell aDepartment Earth and Space Sciences, University Johnson Hall Room‐070, Box 351310, 4000 15th Avenue NE, Seattle, Washington 98195‐1310 U.S.A.crowellb@uw.edu Search other works by this author on: GSW Google Scholar David A. Schmidt; Schmidt Paul Bodin; Bodin John E. Vidale; Vidale Joan Gomberg; Gomberg bU.S. Geological Survey,...
Refinements to GPS analyses in which we factor geodetic time series better estimate both reference frames and transient deformation resolve 34 slow slip events located throughout the Cascadia subduction zone from 1997 through 2005. Timing of onset is determined with wavelet transformation series. Thirty continuous stations are included this study, ranging northern California southwestern British Columbia. Our improvements analysis largest creep also identify many smaller events. At 48.5°N...
Abstract Traditional real-time (RT) seismology has relied on inertial sensors to characterize ground motions and earthquake sources, particularly for hazards applications such as warning systems. In the past decade, a revolution in high-rate, RT Global Navigation Satellite Systems (GNSS) displacement provided new source of data augment traditional measurement devices. The Ridgecrest, California, sequence 2019 one most complete recordings RT-GNSS displacements date, helping aid an initial...
ABSTRACT The ShakeAlert earthquake early warning (EEW) system partners along with U.S. Geological Survey (USGS) licensed operators deliver EEW alerts to the public and trigger automated systems when a significant is expected impact California, Oregon, or Washington. ShakeAlert’s primary goal provide usable times before arrival of damaging shaking. most likely achieve this in large-magnitude earthquakes. In recent years, has gone through series upgrades its underlying scientific algorithms...
Continuous GPS and seismic data from northern California show that slow earthquakes periodically rupture the Gorda‐North America plate interface within southern Cascadia. On average, these creep events have occurred every 10.9 ± 1.2 months since at least 1998. Appearing as week‐long extensional transients reverse secular forearc contraction, a recurrence interval 22% shorter than recognized to north. Seismic tremor here accompanies reversals, correlated across many 5 seismometers. Tremor...
Inversion of continuous GPS measurements from the Pacific Northwest show 2003 Cascadia slow earthquake to be among largest ten transients recognized here. Twelve stations bracketing slip indicate transient propagated bi‐directionally initiation in southern Puget basin, reaching 300 km along‐strike over a period seven weeks. This event produced, for first time, resolvable vertical subsidence, and horizontal displacement six mm Washington State. Inverted non‐negative thrust slip, maximum 3.8...
Abstract Large earthquakes are difficult to model in real‐time with traditional inertial seismic measurements. Several algorithms that leverage high‐rate Global Navigation Satellite Systems (HR‐GNSS) positions have been proposed, and it has shown they can supplement the earthquake monitoring effort. However, analyses of long‐term noise behavior GNSS positions, which important understand how data be used operationally by agencies, limited just a few sites short time spans. Here, we show...
ABSTRACT We have developed a global earthquake deformation monitoring system based on subsecond-latency measurements from ∼2000 existing Global Navigational Satellite System (GNSS) receivers to rapidly characterize large earthquakes and tsunami. The first of its kind, this complements traditional seismic by enabling moment release and, where station density permits, fault-slip distribution, including tsunamigenic slow slip, be quantified as rupture evolves. Precise point position time series...
ABSTRACT We have developed a global earthquake monitoring system based on low-latency measurements from more than 1000 existing Global Navigational Satellite System (GNSS) receivers, of which nine captured the 2019 Mw 6.4 Ridgecrest, California, foreshock and 7.1 mainshock earthquakes. For foreshock, coseismic offsets up to 10 cm are resolvable one station closest fault, but did not trigger automatic offset detection. mainshock, GNSS determined its deformation 70 nearby stations within 25 s...
Traditional real-time seismology has relied on inertial sensors to characterize ground motions and earthquake sources, particularly for hazards applications such as warning systems. In the past decade, a revolution in high-rate, Global Navigation Satellite System (GNSS) displacement have provided new source of data augment traditional measurement devices. The Ridgecrest, California sequence 2019 one most complete recordings GNSS displacements date, helping aid an initial characterization...
Large earthquakes are difficult to model in real-time with traditional inertial seismic measurements. Several algorithms that leverage high-rate RT-GNSS positions have been proposed and it has shown they can supplement the earthquake monitoring effort. However, analyses of long-term noise behavior positions, which important understand how data be used operationally by agencies, limited just a few sites short time spans. Here we show results from an analysis characteristics one year at 213...