Publications
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Emergency assessment of post-fire debris-flow hazards for the 2013 Mountain fire, southern California
Wildfire dramatically alters the hydrologic response of a watershed such that even modest rainstorms can produce dangerous flash floods and debris flows. We use empirical models to predict the probability and magnitude of debris flow occurrence in response to a 10-year rainstorm for the 2013 Mountain fire near Palm Springs, California. Overall, the models predict a relatively high probability (60–
Authors
Dennis M. Staley, Joseph E. Gartner, Greg M. Smoczyk, Ryan R. Reeves
Vs30 and spectral response from collocated shallow, active- and passive-source Vs data at 27 sites in Puerto Rico
Shear‐wave velocity (VS) and time‐averaged shear‐wave velocity to 30 m depth (VS30) are the key parameters used in seismic site response modeling and earthquake engineering design. Where VS data are limited, available data are often used to develop and refine map‐based proxy models of VS30 for predicting ground‐motion intensities. In this paper, we present shallow VS data from 27 sites in Puerto R
Authors
Jack K. Odum, William J. Stephenson, Robert A. Williams, Christa von Hillebrandt-Andrade
Characterizing and estimating noise in InSAR and InSAR time series with MODIS
InSAR time series analysis is increasingly used to image subcentimeter displacement rates of the ground surface. The precision of InSAR observations is often affected by several noise sources, including spatially correlated noise from the turbulent atmosphere. Under ideal scenarios, InSAR time series techniques can substantially mitigate these effects; however, in practice the temporal distributio
Authors
William D. Barnhart, Rowena B. Lohman
An international network of magnetic observatories
Since its formation in the late 1980s, the International Real-Time Magnetic Observatory Network (INTERMAGNET), a voluntary consortium of geophysical institutes from around the world, has promoted the operation of magnetic observatories according to modern standards [eg. Rasson, 2007]. INTERMAGNET institutes have cooperatively developed infrastructure for data exchange and management ads well as me
Authors
Jeffrey J. Love, A. Chulliat
Quaternary extensional growth folding beneath Reno, Nevada, imaged by urban seismic profiling
We characterize shallow subsurface faulting and basin structure along a transect through heavily urbanized Reno, Nevada, with high‐resolution seismic reflection imaging. The 6.8 km of P‐wave data image the subsurface to approximately 800 m depth and delineate two subbasins and basin uplift that are consistent with structure previously inferred from gravity modeling in this region of the northern W
Authors
William J. Stephenson, Roxy N. Frary, John Louie, Jackson K. Odum
Runoff-generated debris flows: observations and modeling of surge initiation, magnitude, and frequency
Runoff during intense rainstorms plays a major role in generating debris flows in many alpine areas and burned steeplands. Yet compared to debris flow initiation from shallow landslides, the mechanics by which runoff generates a debris flow are less understood. To better understand debris flow initiation by surface water runoff, we monitored flow stage and rainfall associated with debris flows in
Authors
Jason W. Kean, Scott W. McCoy, Gregory E. Tucker, Dennis M. Staley, Jeffrey A. Coe
Meeting of the Central and Eastern U.S. (CEUS) Earthquake Hazards Program October 28–29, 2009
On October 28th and 29th, 2009, the U.S. Geological Survey Earthquake Hazards Program held a meeting of Central and Eastern United States investigators and interested parties in Memphis, Tennessee. The purpose of the meeting was to bring together the Central and Eastern United States earthquake-hazards community to present and discuss recent research results, to promote communication and collabora
Authors
Martitia Tuttle, Oliver Boyd, Natasha McCallister
Natural Hazards Science at the U.S. Geological Survey
The mission of the USGS in natural hazards is to develop and apply hazard science to help protect the safety, security, and economic well-being of the Nation. The costs and consequences of natural hazards can be enormous, and each year more people and infrastructure are at risk. The USGS conducts hazard research and works closely with stakeholders and cooperators to inform a broad range of plannin
Authors
Suzanne C. Perry, Lucile M. Jones, Robert R. Holmes
Report of geomagnetic pulsation indices for space weather applications
The phenomenon of ultra-low frequency geomagnetic pulsations was first observed in the ground-based measurements of the 1859 Carrington Event and has been studied for over 100 years. Pulsation frequency is considered to be “ultra” low when it is lower than the natural frequencies of the plasma, such as the ion gyrofrequency. Ultra-low frequency pulsations are considered a source of noise in some g
Authors
Z. Xu, Jennifer L. Gannon, Erin J. Rigler
Obtaining changes in calibration-coil to seismometer output constants using sine waves
The midband sensitivity of a broadband seismometer is one of the most commonly used parameters from station metadata. Thus, it is critical for station operators to robustly estimate this quantity with a high degree of accuracy. We develop an in situ method for estimating changes in sensitivity using sine‐wave calibrations, assuming the calibration coil and its drive are stable over time and temper
Authors
Adam T. Ringler, Charles R. Hutt, Lind S. Gee, Leo D. Sandoval, David C. Wilson
Geomagnetic referencing--the real-time compass for directional drillers
To pinpoint the location and direction of a wellborne, directional driller rely on measurements from accelerometers, magnetometer and gyroscopes. In the past, high-accuracy guidance methods required a halt in drilling to obtain directional measurements. Advances in geomagnetic referencing now allow companies to use real-time data acquired during drilling to accurately potion horizontal wells, decr
Authors
Andrew Buchanan, Carol Finn, Jeffrey J. Love, E. William Worthington, Fraser Lawson, Stefan Maus, Shola Okewunmi, Benny Poedjono
The Anemomilos prediction methodology for Dst
This paper describes new capabilities for operational geomagnetic Disturbance storm time (Dst) index forecasts. We present a data‐driven, deterministic algorithm called Anemomilos for forecasting Dst out to a maximum of 6 days for large, medium, and small storms, depending upon transit time to the Earth. This capability is used for operational satellite management and debris avoidance in Low Earth
Authors
W. K. Tobiska, D. Knipp, W. J. Burke, D. Bouwer, J. Bailey, D. Odstrcil, M. P. Hagan, J. Gannon, B. R. Bowman