Publications
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Geomorphic and geologic controls of geohazards induced by Nepal’s 2015 Gorkha earthquake
The Gorkha earthquake (magnitude 7.8) on 25 April 2015 and later aftershocks struck South Asia, killing ~9000 people and damaging a large region. Supported by a large campaign of responsive satellite data acquisitions over the earthquake disaster zone, our team undertook a satellite image survey of the earthquakes’ induced geohazards in Nepal and China and an assessment of the geomorphic, tectonic
Authors
J.S. Kargel, G.J. Leonard, D. H. Shugar, U. K. Haritashya, A. Bevington, E.J. Fielding, K. Fujita, M. Geertsema, E. S. Miles, J. Steiner, E. Anderson, S. Bajracharya, G.W. Bawden, D. F. Breashears, A. Byers, B. Collins, M. R. Dhital, A. Donnellan, T. L. Evans, M. L. Geai, M. T. Glasscoe, D. Green, D. R. Gurung, R. Heijenk, A. Hilborn, K. Hudnut, C. Huyck, W. W. Immerzeel, Jiang Li, R. Jibson, A. Kaab, N. R. Khanal, D. Kirschbaum, P. D. A. Kraaijenbrink, D. Lamsal, Liu Shiyin, Lv Mingyang, D. McKinney, N. K. Nahirnick, Nan Zhuotong, S. Ojha, J. Olsenholler, T. H. Painter, M. Pleasants, K. C. Pratima, Q. I. Yuan, B.H. Raup, D. Regmi, D. R. Rounce, A. Sakai, Shangguan Donghui, J. M. Shea, A. B. Shrestha, A. Shukla, D. Stumm, M. van der Kooij, K. Voss, Wang Xin, B. Weihs, Wu Lizong, Yao Xiaojun, M. R. Yoder, N. Young
Uncertainty in Vs30-based site response
Methods that account for site response range in complexity from simple linear categorical adjustment factors to sophisticated nonlinear constitutive models. Seismic‐hazard analysis usually relies on ground‐motion prediction equations (GMPEs); within this framework site response is modeled statistically with simplified site parameters that include the time‐averaged shear‐wave velocity to 30 m (VS30
Authors
Eric M. Thompson, David J. Wald
Get your science used—Six guidelines to improve your products
Introduction
Natural scientists, like many other experts, face challenges when communicating to people outside their fields of expertise. This is especially true when they try to communicate to those whose background, knowledge, and experience are far distant from that field of expertise.
At a recent workshop, experts in risk communication offered insights into the communication challenges of prob
Authors
Suzanne C. Perry, Michael L. Blanpied, Erin R. Burkett, Nnenia M. Campbell, Anders Carlson, Dale A. Cox, Carolyn L. Driedger, David P. Eisenman, Katherine T. Fox-Glassman, Sherry Hoffman, Susanna M. Hoffman, Kishor S. Jaiswal, Lucile M. Jones, Nicolas Luco, Sabine M. Marx, Sean M. McGowan, Dennis S. Mileti, Morgan P. Moschetti, David Ozman, Elizabeth Pastor, Mark D. Petersen, Keith A. Porter, David W. Ramsey, Liesel A. Ritchie, Jessica K. Fitzpatrick, Kenneth S. Rukstales, Timothy L. Sellnow, Wendy L. Vaughon, David J. Wald, Lisa A. Wald, Anne Wein, Christina Zarcadoolas
Mountain building on Io driven by deep faulting
Jupiter’s volcanic moon Io possesses some of the highest relief in the Solar System: massive, isolated mountain blocks that tower up to 17 km above the surrounding plains. These mountains are likely to result from pervasive compressive stresses induced by subsidence of the surface beneath the near-continual emplacement of volcanic material. The stress state that results from subsidence and warming
Authors
Michael T. Bland, William B. McKinnon
The geologic history of Margaritifer basin, Mars
In this study, we investigate the fluvial, sedimentary, and volcanic history of Margaritifer basin and the Uzboi-Ladon-Morava (ULM) outflow channel system. This network of valleys and basins spans more than 8000 km in length, linking the fluvially dissected southern highlands and Argyre Basin with the northern lowlands via Ares Vallis. Compositionally, thermophysically, and morphologically distinc
Authors
M. R. Salvatore, M. D. Kraft, Christopher Edwards, P. R. Christensen
“Ductile to brittle” transition in thermally stable antigorite gouge at mantle pressures
General shear experiments on antigorite-rich serpentinite show a transition from ductile (distributed) to brittle (localized) deformation with increasing temperature from 300°C to 500°C at confining pressures from 1 to 2 GPa. The coefficient of friction associated with slip along fractures decreases from 0.23 to 0.07 with an increase in temperature from 300°C to 500°C. Velocity stepping experiment
Authors
Brooks P. Proctor, Greg Hirth
Afterslip behavior following the M6.0, 2014 South Napa earthquake with implications for afterslip forecasting on other seismogenic faults
The M6.0, 24 Aug. 2014 South Napa, California, earthquake exhibited unusually large slip for a California strike-slip event of its size with a maximum coseismic surface slip of 40-50 cm in the north section of the 15 km-long rupture. Although only minor (
Authors
James J. Lienkaemper, Stephen B. DeLong, Carolyn J Domrose, Carla M. Rosa
High-resolution seismic reflection imaging of growth folding and shallow faults beneath the Southern Puget Lowland, Washington State
Marine seismic reflection data from southern Puget Sound, Washington, were collected to investigate the nature of shallow structures associated with the Tacoma fault zone and the Olympia structure. Growth folding and probable Holocene surface deformation were imaged within the Tacoma fault zone beneath Case and Carr Inlets. Shallow faults near potential field anomalies associated with the Olympia
Authors
Jackson K. Odum, William J. Stephenson, Thomas L. Pratt, Richard J. Blakely
Potential improvements in horizontal very broadband seismic data in the IRIS/USGS component of the Global Seismic Network
The Streckeisen STS‐1 has been the primary vault‐type seismometer used in the over‐150‐station Global Seismographic Network (GSN). This sensor has long been known for its outstanding vertical, very long‐period (e.g., >100 s period), and low‐noise performance, although the horizontal long‐period noise performance is less well known. The STS‐1 is a limited, important resource, because it is no long
Authors
Adam T. Ringler, J.M. Steim, T Zandt, Charles R. Hutt, David C. Wilson, Tyler Storm
Estimating time-dependent connectivity in marine systems
Hydrodynamic connectivity describes the sources and destinations of water parcels within a domain over a given time. When combined with biological models, it can be a powerful concept to explain the patterns of constituent dispersal within marine ecosystems. However, providing connectivity metrics for a given domain is a three-dimensional problem: two dimensions in space to define the sources and
Authors
Zafer Defne, Neil K. Ganju, Alfredo Aretxabaleta
Rock-avalanche dynamics revealed by large-scale field mapping and seismic signals at a highly mobile avalanche in the West Salt Creek valley, western Colorado
On 25 May 2014, a rain-on-snow–induced rock avalanche occurred in the West Salt Creek valley on the northern flank of Grand Mesa in western Colorado (United States). The avalanche mobilized from a preexisting rock slide in the Green River Formation and traveled 4.6 km down the confined valley, killing three people. The avalanche was rare for the contiguous United States because of its large size (
Authors
Jeffrey A. Coe, Rex L. Baum, Kate E. Allstadt, Bernard Kochevar, Robert G. Schmitt, Matthew L. Morgan, Jonathan L. White, Benjamin T. Stratton, Timothy A. Hayashi, Jason W. Kean
Reflectance spectroscopy (0.35–8 μm) of ammonium-bearing minerals and qualitative comparison to Ceres-like asteroids
Ammonium-bearing minerals have been suggested to be present on Mars, Ceres, and various asteroids and comets. We undertook a systematic study of the spectral reflectance properties of ammonium-bearing minerals and compounds that have possible planetary relevance (i.e., ammonium carbonates, chlorides, nitrates, oxalates, phosphates, silicates, and sulfates). Various synthetic and natural NH4+-beari
Authors
Breanne L. Berg, Edward A. Cloutis, P. Beck, P. Vernazza, Janice L Bishop, Driss Takir, V. Reddy, D. Applin, Paul Mann