Publications
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Overcoming barriers to progress in seismic monitoring and characterization of debris flows and lahars
Debris flows generate seismic signals that contain valuable information about events as they unfold. Though seismic waves have been used for along-channel debris-flow and lahar monitoring systems for decades, it has proven difficult to move beyond detection to more quantitative characterizations of flow parameters and event size. This is for two primary reasons: (1) our limited understanding of ho
Authors
Kate E. Allstadt, Maxime Farin, Andrew Lockhart, Sara McBride, Jason W. Kean, Richard M. Iverson, Matthew Logan, Joel B. Smith, Victor C. Tsai, David L. George
Significant seismic behavior features of two tall buildings inferred from response records
In this paper, recent studies of recorded responses of behavior and performances of two instrumented tall buildings subjected to long-period motions from events that originate at far distances (e.g. 100-800km) are presented. Significant results indicate that (a) computed average drift ratios are substantial (~0.5%), and (b) there is permanent shift of fundamental frequencies for a tall building wh
Authors
Mehmet Çelebi
Pedogenic evolution on the arid Bishop Creek moraines, eastern Sierra Nevada, California
Soil chronosequences on alpine moraine complexes have been used to help unravel the glacial histories of the eastern Sierra Nevada. The moraine sequence along Bishop Creek includes well-preserved moraines that have been previously dated using cosmogenic 36Cl surface exposure ages. The goal of this study was to interpret pedogenesis within a soil geomorphic context on these quantitatively dated mor
Authors
Annie Rossi, Robert Graham, Katherine J. Kendrick
Establishing high-frequency noise baselines to 100 Hz based on millions of power spectra from IRIS MUSTANG
Advances in seismic instrumentation have enabled data to be recorded at increasing sample rates. This has in turn created a need to establish higher-frequency baselines for assessing data quality, as the widely-used New High (NHNM) and Low Noise Models (NLNM) of Peterson (1993) do not extend to frequencies above 10 Hz. To provide a baseline for higher frequencies (10-100 Hz), we examine power sp
Authors
Emily Wolin, Daniel McNamara
Analog experiments of lava flow emplacement
Laboratory experiments that simulate lava flows have been in use by volcanologists for many years. The behavior of flows in the lab, where “eruption” parameters, material properties, and environmental settings are tightly controlled, provides insight into the influence of various factors on flow evolution. A second benefit of laboratory lava flows is to provide a set of observations with which num
Authors
Einat Lev, M. Elise Rumpf, Hannah R. Dietterich
National assessment of shoreline change — Historical shoreline change along the north coast of Alaska, Icy Cape to Cape Prince of Wales
Beach erosion is a persistent problem along most open-ocean shores of the United States. Along the Arctic coast of Alaska, coastal erosion is widespread and threatens communities, defense and energy-related infrastructure, and coastal habitat. As coastal populations continue to expand and infrastructure and habitat are increasingly threatened by erosion, there is increased demand for accurate info
Authors
Ann E. Gibbs, Alexander G. Snyder, Bruce M. Richmond
Catastrophic landscape modification from a massive landslide tsunami in Taan Fiord, Alaska
The October 17th, 2015 Taan Fiord landslide and tsunami generated a runup of 193 m, nearly an order of magnitude greater than most previously surveyed tsunamis. To date, most post-tsunami surveys are from earthquake-generated tsunamis and the geomorphic signatures of landslide tsunamis or their potential for preservation are largely uncharacterized. Additionally, clear modifications described duri
Authors
Colin K Bloom, Breanyn MacInnes, Bretwood Higman, Dan H. Shugar, Jeremy G. Venditti, Bruce M. Richmond, Eric L. Bilderback
Some experiments in extreme-value statistical modeling of magnetic superstorm intensities
In support of projects for forecasting and mitigating the deleterious effects of extreme space-weather storms, an examination is made of the intensities of magnetic superstorms recorded in the Dst index time series (1957-2016). Modified peak-over-threshold and solar-cycle, block-maximum sampling of the Dst time series are performed to obtain compi-lations of storm-maximum −Dstm intensity values. Log
Authors
Jeffrey J. Love
Thresholds for post-wildfire debris flows: Insights from the Pinal Fire, Arizona, USA
Wildfire significantly alters the hydrologic properties of a burned area, leading to increases in overland flow, erosion, and the potential for runoff-generated debris flows. The initiation of debris flows in recently burned areas is well-characterized by rainfall intensity-duration (ID) thresholds. However, there is currently a paucity of data quantifying the rainfall intensities required to trig
Authors
Carissa A Raymond, Luke A. McGuire, Ann M. Youberg, Dennis M. Staley, Jason W. Kean
What determines the downstream evolution of turbidity currents?
Seabed sediment flows called turbidity currents form some of the largest sediment accumulations, deepest canyons and longest channel systems on Earth. Only rivers transport comparable sediment volumes over such large areas; but there are far fewer measurements from turbidity currents, ensuring they are much more poorly understood. Turbidity currents differ fundamentally from rivers, as turbidity c
Authors
Catharina Heerema, Peter J. Talling, Matthieu J.B. Cartigny, Charles K. Paull, Lewis Bailey, Stephen Simmons, Daniel Parsons, Michael Clare, Roberto Gwiazda, Eve M. Lundsten, Krystle Anderson, Katherine L. Maier, Jingping Xu, Esther J. Sumner, Kurt J. Rosenberger, Jenny Gales, Mary McGann, Lionel Carter, Ed Pope
U.S. Geological Survey EDMAP Program—Training the next generation of geologic mappers
Detailed geologic maps are the basis of nearly every Earth-science investigation and can be used for natural hazard mitigation, resource identification and exploration, infrastructure planning, and more. A component of the congressionally mandated National Cooperative Geologic Mapping Program, EDMAP is a partnership among the U.S. Geological Survey, the Association of American State Geologists, an
Authors
Abby Ackerman, Darcy McPhee
Illuminating subduction zone rheological properties in the wake of a giant earthquake
Deformation associated with plate convergence at subduction zones is accommodated by a complex system involving fault slip and viscoelastic flow. These processes have proven difficult to disentangle. The 2010 Mw 8.8 Maule earthquake occurred close to the Chilean coast within a dense network of continuously recording Global Positioning System stations, which provide a comprehensive history of surfa
Authors
Jonathan Weiss, Qiang Qiu, Sylvain Barbot, Tim J. Wright, James H. Foster, Alexander Saunders, Benjamin A. Brooks, Michael Bevis, Eric Kendrick, Todd Ericksen, Jonathan Avery, Robert Smalley, Sergio R. Cimbaro, Luis E. Lenzano, Jorge Barón, Juan Carlos Báez, Arturo Echalar