Publications
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Effect of antecedent-hydrological conditions on rainfall triggering of debris flows in ash-fall pyroclastic mantled slopes of Campania (southern Italy) Effect of antecedent-hydrological conditions on rainfall triggering of debris flows in ash-fall pyroclastic mantled slopes of Campania (southern Italy)
Mountainous areas surrounding the Campanian Plain and the Somma-Vesuvius volcano (southern Italy) are among the most risky areas of Italy due to the repeated occurrence of rainfallinduced debris flows along ash-fall pyroclastic soil-mantled slopes. In this geomorphological framework, rainfall patterns, hydrological processes taking place within multi-layered ash-fall pyroclastic deposits...
Authors
E. Napolitano, F Fusco, Rex L. Baum, Jonathan W. Godt, P. De Vita
A one-dimensional model of solid-earth electrical resistivity beneath Florida A one-dimensional model of solid-earth electrical resistivity beneath Florida
An estimated one-dimensional layered model of electrical resistivity beneath Florida was developed from published geological and geophysical information. The resistivity of each layer is represented by plausible upper and lower bounds as well as a geometric mean resistivity. Corresponding impedance transfer functions, Schmucker-Weidelt transfer functions, apparent resistivity, and phase...
Authors
Cletus Blum, Jeffrey J. Love, Kolby Pedrie, Paul A. Bedrosian, E. Joshua Rigler
Geotechnical effects of the 2015 magnitude 7.8 Gorkha, Nepal, earthquake and aftershocks Geotechnical effects of the 2015 magnitude 7.8 Gorkha, Nepal, earthquake and aftershocks
This article summarizes the geotechnical effects of the 25 April 2015 M 7.8 Gorkha, Nepal, earthquake and aftershocks, as documented by a reconnaissance team that undertook a broad engineering and scientific assessment of the damage and collected perishable data for future analysis. Brief descriptions are provided of ground shaking, surface fault rupture, landsliding, soil failure, and
Authors
Robb E. S. Moss, Eric M. Thompson, D Scott Kieffer, Binod Tiwari, Youssef M A Hashash, Indra Acharya, Basanta Adhikari, Domniki Asimaki, Kevin B. Clahan, Brian D. Collins, Sachindra Dahal, Randall W. Jibson, Diwakar Khadka, Amy Macdonald, Chris L M Madugo, H Benjamin Mason, Menzer Pehlivan, Deepak Rayamajhi, Sital Uprety
An overview of the National Earthquake Information Center acquisition software system, Edge/Continuous Waveform Buffer An overview of the National Earthquake Information Center acquisition software system, Edge/Continuous Waveform Buffer
This document provides an overview of the capabilities, design, and use cases of the data acquisition and archiving subsystem at the U.S. Geological Survey National Earthquake Information Center. The Edge and Continuous Waveform Buffer software supports the National Earthquake Information Center’s worldwide earthquake monitoring mission in direct station data acquisition, data import...
Authors
John M. Patton, David C. Ketchum, Michelle R. Guy
Reactivated faulting near Cushing, Oklahoma: Increased potential for a triggered earthquake in an area of United States strategic infrastructure Reactivated faulting near Cushing, Oklahoma: Increased potential for a triggered earthquake in an area of United States strategic infrastructure
In October 2014 two moderate-sized earthquakes (Mw 4.0 and 4.3) struck south of Cushing, Oklahoma, below the largest crude oil storage facility in the world. Combined analysis of the spatial distribution of earthquakes and regional moment tensor focal mechanisms indicate reactivation of a subsurface unnamed and unmapped left-lateral strike-slip fault. Coulomb failure stress change...
Authors
Daniel E. McNamara, Gavin P. Hayes, Harley M. Benz, Robert Williams, Nicole D McMahon, R.C. Aster, Austin F. Holland, T Sickbert, Robert B. Herrmann, Richard W. Briggs, Gregory M. Smoczyk, Eric Bergman, Paul S. Earle
A random-walk algorithm for modeling lithospheric density and the role of body forces in the evolution of the Midcontinent Rift A random-walk algorithm for modeling lithospheric density and the role of body forces in the evolution of the Midcontinent Rift
This paper develops a Monte Carlo algorithm for extracting three-dimensional lithospheric density models from geophysical data. Empirical scaling relationships between velocity and density create a 3D starting density model, which is then iteratively refined until it reproduces observed gravity and topography. This approach permits deviations from uniform crustal velocity-density scaling...
Authors
William Brower Levandowski, Oliver S. Boyd, Richard W. Briggs, Ryan D. Gold
Ground motion-simulations of 1811-1812 New Madrid earthquakes, central United States Ground motion-simulations of 1811-1812 New Madrid earthquakes, central United States
We performed a suite of numerical simulations based on the 1811–1812 New Madrid seismic zone (NMSZ) earthquakes, which demonstrate the importance of 3D geologic structure and rupture directivity on the ground‐motion response throughout a broad region of the central United States (CUS) for these events. Our simulation set consists of 20 hypothetical earthquakes located along two faults...
Authors
L. Ramirez-Guzman, Robert Graves, Kim Olsen, Oliver S. Boyd, Chris H. Cramer, Stephen H. Hartzell, Sidao Ni, Paul G. Somerville, Robert Williams, Jinquan Zhong
Development of the Global Earthquake Model’s neotectonic fault database Development of the Global Earthquake Model’s neotectonic fault database
The Global Earthquake Model (GEM) aims to develop uniform, openly available, standards, datasets and tools for worldwide seismic risk assessment through global collaboration, transparent communication and adapting state-of-the-art science. GEM Faulted Earth (GFE) is one of GEM’s global hazard module projects. This paper describes GFE’s development of a modern neotectonic fault database...
Authors
Annemarie Christophersen, Nicola Litchfield, Kelvin Berryman, Richard Thomas, Roberto Basili, Laura Wallace, William Ries, Gavin P. Hayes, Kathleen M. Haller, Toshikazu Yoshioka, Richard D. Koehler, Dan Clark, Monica Wolfson-Schwehr, Margaret S. Boettcher, Pilar Villamor, Nick Horspool, Teraphan Ornthammarath, Ramon Zuniga, Robert M. Langridge, Mark W. Stirling, Tatiana Goded, Carlos Costa, Robert Yeats
Ionospheric current source modeling and global geomagnetic induction using ground geomagnetic observatory data Ionospheric current source modeling and global geomagnetic induction using ground geomagnetic observatory data
Long-period global-scale electromagnetic induction studies of deep Earth conductivity are based almost exclusively on magnetovariational methods and require accurate models of external source spatial structure. We describe approaches to inverting for both the external sources and three-dimensional (3-D) conductivity variations and apply these methods to long-period (T≥1.2 days)...
Authors
Jin Sun, Anna Kelbert, G. D. Egbert
Aurora painting pays tribute to Civil War's end Aurora painting pays tribute to Civil War's end
This year marks the sesquicentennial anniversary of the end of the American Civil War, a conflict that Abraham Lincoln called a “mighty scourge.” It was one of the most poignant periods in U.S. history, laying bare political, economic, social, and moral divergence between Northern and Southern states. The cause of the divergence that led to war was slavery [e.g., McPherson, 1988, chap. 3...
Authors
Jeffrey J. Love
A quick SEED tutorial A quick SEED tutorial
Authors
Adam T. Ringler, John R. Evans
Scaling and design of landslide and debris-flow experiments Scaling and design of landslide and debris-flow experiments
Scaling plays a crucial role in designing experiments aimed at understanding the behavior of landslides, debris flows, and other geomorphic phenomena involving grain-fluid mixtures. Scaling can be addressed by using dimensional analysis or – more rigorously – by normalizing differential equations that describe the evolving dynamics of the system. Both of these approaches show that...
Authors
Richard M. Iverson