Valerie Irene Thomas
Valerie Thomas is a scientist in the Earthquake Hazards Program.
Science and Products
Phase 1 technical implementation plan for the expansion of the ShakeAlert earthquake early warning system to Alaska
Executive SummaryThe conference report accompanying the fiscal year (FY) 2022 Consolidated Appropriations Act (Public Law 117–103) for the U.S. Department of the Interior and related agencies directed the U.S. Geological Survey (USGS) to “work with the State of Alaska to develop an implementation plan to be completed within two years in order to put ShakeAlert/Earthquake Early Warning in...
Authors
Cecily J. Wolfe, Natalia A. Ruppert, Douglas D. Given, Michael E. West, Valerie I. Thomas, Jessica R. Murray, Ronni Grapenthin
ShakeAlert® version 3: Expected performance in large earthquakes
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 earthquake is expected to impact California, Oregon, or Washington. ShakeAlert’s primary goal is to provide usable warning times before the arrival of damaging shaking. EEW is most...
Authors
Jeffrey J. McGuire, Carl W. Ulberg, Angela I. Lux, Maren Böse, J.R. Andrews, Deborah E. Smith, B. Crowell, Jessica R. Murray, I. Henson, R. Hartog, C. Felizardo, Minh Huynh, Mario Aranha, Grace Alexandra Parker, Annemarie S. Baltay Sundstrom, Mark Hunter Murray, Glenn Biasi, Stephen Guiwits, J.K. Saunders, Andrew D. Good, V. Marcelo Santillan, C.W. Scrivener, Walter M. Szeliga, Timothy I. Melbourne, Victor Kress, Robert Michael deGroot, Sara K. McBride, Douglas D. Given, Richard M. Allen, Thomas H. Heaton, Allen L. Husker, Valerie I. Thomas, Harold Tobin, Sumant Jha, Julian J Bunn
U.S. Geological Survey Earthquake Hazards Program decadal science strategy, 2024–33
Executive Summary Earthquakes represent one of our Nation’s most significant and costly natural hazards, with estimated annual loses from earthquakes close to $15 billion in 2023. Over the past two centuries, 37 U.S. States have experienced an earthquake exceeding a magnitude of 5, and 50 percent of States have a significant potential for future damaging shaking; these statistics speak...
Authors
Gavin P. Hayes, Annemarie S. Baltay Sundstrom, William D. Barnhart, Michael L. Blanpied, Lindsay A. Davis, Paul S. Earle, Ned Field, Jill M. Franks, Douglas D. Given, Ryan D. Gold, Christine A. Goulet, Michelle M. Guy, Jeanne L. Hardebeck, Nico Luco, Frederick Pollitz, Adam T. Ringler, Katherine M. Scharer, Steven Sobieszczyk, Valerie I. Thomas, Cecily J. Wolfe
Caltech/USGS Southern California Seismic Network (SCSN) and Southern California Earthquake Data Center (SCEDC): Data availability for the 2019 Ridgecrest sequence
The 2019 M6.4 and M7.1 Ridgecrest earthquake sequence occurred in the eastern California shear zone (ECSZ). The mainshock ruptured the Little Lake fault zone and aftershocks extended from the Garlock fault in the south, to the southern end of the 1872 M7.5 Owens Valley earthquake rupture in the north. We present data from the Southern California Seismic Network (SCSN) and partner seismic...
Authors
Egill Hauksson, Clara Yoon, Ellen Yu, Jennifer R Andrews, Mark Alvarez, Rayo Bhadha, Valerie I. Thomas
Regional Global Navigation Satellite System networks for crustal deformation monitoring
Regional networks of Global Navigation Satellite System (GNSS) stations cover seismically and volcanically active areas throughout the United States. Data from these networks have been used to produce high‐precision, three‐component velocity fields covering broad geographic regions as well as position time series that track time‐varying crustal deformation. This information has...
Authors
Jessica R. Murray, Noel Bartlow, Yehuda Bock, Benjamin A. Brooks, James H. Foster, Jeffery T. Freymueller, William R. Hammond, Kathleen Hodgkinson, Ingrid A. Johanson, Alberto Lopez-Venegas, Doerte Mann, Glen Mattioli, Timothy Melbourne, David Mencin, Emily K. Montgomery-Brown, Mark Hunter Murray, Robert Smalley, Valerie I. Thomas
The Station Information System (SIS): A centralized seismic station repository for populating, managing, and distributing metadata
Creating, maintaining, and archiving accurate station metadata is critical for successful seismic network operations, data discovery, and research. The Station Information System (SIS) is a centralized repository of seismic station equipment inventory, instrument response, and site information of stations operated by regional seismic networks (RSNs) of the Advanced National Seismic...
Authors
Ellen Yu, Prabha Acharya, Justin Jaramillo, Sue Kientz, Valerie I. Thomas, Egill Hauksson
Science and Products
Phase 1 technical implementation plan for the expansion of the ShakeAlert earthquake early warning system to Alaska
Executive SummaryThe conference report accompanying the fiscal year (FY) 2022 Consolidated Appropriations Act (Public Law 117–103) for the U.S. Department of the Interior and related agencies directed the U.S. Geological Survey (USGS) to “work with the State of Alaska to develop an implementation plan to be completed within two years in order to put ShakeAlert/Earthquake Early Warning in...
Authors
Cecily J. Wolfe, Natalia A. Ruppert, Douglas D. Given, Michael E. West, Valerie I. Thomas, Jessica R. Murray, Ronni Grapenthin
ShakeAlert® version 3: Expected performance in large earthquakes
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 earthquake is expected to impact California, Oregon, or Washington. ShakeAlert’s primary goal is to provide usable warning times before the arrival of damaging shaking. EEW is most...
Authors
Jeffrey J. McGuire, Carl W. Ulberg, Angela I. Lux, Maren Böse, J.R. Andrews, Deborah E. Smith, B. Crowell, Jessica R. Murray, I. Henson, R. Hartog, C. Felizardo, Minh Huynh, Mario Aranha, Grace Alexandra Parker, Annemarie S. Baltay Sundstrom, Mark Hunter Murray, Glenn Biasi, Stephen Guiwits, J.K. Saunders, Andrew D. Good, V. Marcelo Santillan, C.W. Scrivener, Walter M. Szeliga, Timothy I. Melbourne, Victor Kress, Robert Michael deGroot, Sara K. McBride, Douglas D. Given, Richard M. Allen, Thomas H. Heaton, Allen L. Husker, Valerie I. Thomas, Harold Tobin, Sumant Jha, Julian J Bunn
U.S. Geological Survey Earthquake Hazards Program decadal science strategy, 2024–33
Executive Summary Earthquakes represent one of our Nation’s most significant and costly natural hazards, with estimated annual loses from earthquakes close to $15 billion in 2023. Over the past two centuries, 37 U.S. States have experienced an earthquake exceeding a magnitude of 5, and 50 percent of States have a significant potential for future damaging shaking; these statistics speak...
Authors
Gavin P. Hayes, Annemarie S. Baltay Sundstrom, William D. Barnhart, Michael L. Blanpied, Lindsay A. Davis, Paul S. Earle, Ned Field, Jill M. Franks, Douglas D. Given, Ryan D. Gold, Christine A. Goulet, Michelle M. Guy, Jeanne L. Hardebeck, Nico Luco, Frederick Pollitz, Adam T. Ringler, Katherine M. Scharer, Steven Sobieszczyk, Valerie I. Thomas, Cecily J. Wolfe
Caltech/USGS Southern California Seismic Network (SCSN) and Southern California Earthquake Data Center (SCEDC): Data availability for the 2019 Ridgecrest sequence
The 2019 M6.4 and M7.1 Ridgecrest earthquake sequence occurred in the eastern California shear zone (ECSZ). The mainshock ruptured the Little Lake fault zone and aftershocks extended from the Garlock fault in the south, to the southern end of the 1872 M7.5 Owens Valley earthquake rupture in the north. We present data from the Southern California Seismic Network (SCSN) and partner seismic...
Authors
Egill Hauksson, Clara Yoon, Ellen Yu, Jennifer R Andrews, Mark Alvarez, Rayo Bhadha, Valerie I. Thomas
Regional Global Navigation Satellite System networks for crustal deformation monitoring
Regional networks of Global Navigation Satellite System (GNSS) stations cover seismically and volcanically active areas throughout the United States. Data from these networks have been used to produce high‐precision, three‐component velocity fields covering broad geographic regions as well as position time series that track time‐varying crustal deformation. This information has...
Authors
Jessica R. Murray, Noel Bartlow, Yehuda Bock, Benjamin A. Brooks, James H. Foster, Jeffery T. Freymueller, William R. Hammond, Kathleen Hodgkinson, Ingrid A. Johanson, Alberto Lopez-Venegas, Doerte Mann, Glen Mattioli, Timothy Melbourne, David Mencin, Emily K. Montgomery-Brown, Mark Hunter Murray, Robert Smalley, Valerie I. Thomas
The Station Information System (SIS): A centralized seismic station repository for populating, managing, and distributing metadata
Creating, maintaining, and archiving accurate station metadata is critical for successful seismic network operations, data discovery, and research. The Station Information System (SIS) is a centralized repository of seismic station equipment inventory, instrument response, and site information of stations operated by regional seismic networks (RSNs) of the Advanced National Seismic...
Authors
Ellen Yu, Prabha Acharya, Justin Jaramillo, Sue Kientz, Valerie I. Thomas, Egill Hauksson