Publications
Filter Total Items: 7171
Evaluation of 2-D shear-wave velocity models and VS30at six strong-motion recording stations in southern California using multichannel analysis of surface waves and refraction tomography
To better understand the potential for amplified ground shaking at sites that house critical infrastructure, the U.S. Geological Survey (USGS) evaluated shear-wave velocities (VS) at six strong-motion recording stations in Southern California Edison facilities in southern California. We calculated VS30 (time-averaged shear-wave velocity in the upper 30 meters [m]), which is a parameter used in gro
Authors
Joanne H. Chan, Rufus D. Catchings, Mark R. Goldman, Coyn J. Criley, Robert R. Sickler
The evolution of a young ocean within Mimas
The fractured, young surfaces on confirmed ocean worlds such as Europa and Enceladus suggest that ocean-bearing moons with relatively thin overlying ice shells should be easy to identify. Hence, the discovery that Mimas’ rotation state is best explained by an internal ocean seems challenging to reconcile with its heavily cratered surface. Previous studies have shown that an internal ocean is compa
Authors
A. R. Rhoden, M. E. Walker, M. L. Rudolph, Michael T. Bland, Michael Manga
Preliminary implications of viscoelastic ray theory for anelastic seismic tomography models
The recent developments in general viscoelastic ray theory provide a rigorous mathematical framework for anelastic seismic tomography. They provide closed‐form solutions of forward ray‐tracing and simple inverse problems for anelastic horizontal and spherical layered media with material gradients. They provide ray‐tracing computation algorithms valid for all angles of incidence that account for ch
Authors
Roger D. Borcherdt
Performance-based earthquake early warning for tall buildings
The ShakeAlert Earthquake Early Warning (EEW) system aims to issue an advance warning to residents on the West Coast of the United States seconds before the ground shaking arrives, if the expected ground shaking exceeds a certain threshold. However, residents in tall buildings may experience much greater motion due to the dynamic response of the buildings. Therefore, there is an ongoing effort to
Authors
S. Farid Ghahari, Khachik Sargsyan, Grace Alexandra Parker, Dan Swensen, Mehmet Çelebi, Hamid Haddadi, Ertugrul Taciroglu
Summary of Creepmeter Data from 1980 to 2020—Measurements Spanning the Hayward, Calaveras, and San Andreas Faults in Northern and Central California
This report is an update to the presentation by Schulz (1989) introducing potential users to the creepmeter data collected between the publication of Schulz’s report and mid-2020. The creepmeter network monitors aseismic, surface slip at various locations on the Hayward, Calaveras, and San Andreas Faults in northern and central California. There are different designs of creepmeters and these are b
Authors
John Langbein, Roger G. Bilham, Hollice A. Snyder, Todd Ericksen
Distinct yet adjacent earthquake sequences near the Mendocino Triple Junction: 20 December 2021 Mw 6.1 and 6.0 Petrolia, and 20 December 2022 Mw 6.4 Ferndale
Two earthquake sequences occurred a year apart at the Mendocino Triple Junction in northern California: first the 20 December 2021 �w 6.1 and 6.0 Petrolia sequence, then the 20 December 2022 �w 6.4 Ferndale sequence. To delineate active faults and understand the relationship between these sequences, we applied an automated deep‐learning workflow to create enhanced and relocated earthquake catalogs
Authors
Clara Yoon, David R. Shelly
Data-driven adjustments for combined use of NGA-East hard-rock ground motion and site amplification models
Model development in the Next Generation Attenuation-East (NGA-East) project included two components developed concurrently and independently: (1) earthquake ground-motion models (GMMs) that predict the median and aleatory variability of various intensity measures conditioned on magnitude and distance, derived for a reference hard-rock site condition with an average shear-wave velocity in the uppe
Authors
Maria E. Ramos-Sepulveda, Jonathan P. Stewart, Grace Alexandra Parker, Morgan P. Moschetti, Eric M. Thompson, Scott J. Brandenberg, Youssef M A Hashash, Ellen M. Rathje
Induced seismicity strategic vision
Executive SummaryThe U.S. Geological Survey has a long history of contributions to the understanding and resolution of various scientific questions related to earthquakes associated with human activities, referred to as induced seismicity. Work started with the Rocky Mountain Arsenal studies in the 1960’s (Healy and others, 1968) when it was first discovered that fluid waste-disposal operations ca
Authors
Elizabeth S. Cochran, Justin L. Rubinstein, Andrew J. Barbour, J. Ole Kaven
Havasuw baj gwawg gnavg
The conceptual risk framework, previously developed by the U.S. Geological Survey, for uranium mining was updated to include indigenous knowledge components informed by the Havasupai Tribe perspective. This General Information Product was designed to show the contaminant exposure framework from the Havasupai perspective in the Havasupai language.
Authors
Carletta Tilousi, Jo Ellen Hinck
Conceptual risk framework—Havasupai perspective
The conceptual risk framework, previously developed by the U.S. Geological Survey, for uranium mining was updated to include indigenous knowledge components informed by the Havasupai Tribe perspective. This General Information Product was designed to show the contaminant risk framework from the Havasupai perspective.
Authors
Carletta Tilousi, Jo Ellen Hinck
Contaminant exposure framework—Havasupai perspective
The conceptual risk framework, previously developed by the U.S. Geological Survey, for uranium mining was updated to include indigenous knowledge components informed by the Havasupai Tribe perspective. This General Information Product was designed to show the contaminant exposure framework from the Havasupai perspective.
Authors
Carletta Tilousi, Jo Ellen Hinck
Incorporating intensity distance attenuation into PLUM ground-motion-based earthquake early warning in the United States: The APPLES configuration
We develop Attenuated ProPagation of Local Earthquake Shaking (APPLES), a new configuration for the United States West Coast version of the Propagation of Local Undamped Motion (PLUM) earthquake early warning (EEW) algorithm that incorporates attenuation into its ground-motion prediction procedures. Under APPLES, instead of using a fixed radius to forward-predict observed peak ground shaking to th
Authors
Jessie K. Saunders, Elizabeth S. Cochran, Julian Bunn, Annemarie S. Baltay, Sarah E. Minson, Colin T O'Rourke