Publications
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No magmatic driving force for Europan sea-floor volcanism
The internal ocean of Jupiter’s moon Europa is thought to be a prime candidate for hosting extraterrestrial life. Europa’s silicate interior may contribute to habitability via the generation of reactants through hydrothermal activity, serpentinization, or other geological processes occurring on or just below Europa’s seafloor. However, silicate melting is thought to occur at >100 km...
Authors
A.P. Green, Catherine Elder, Michael Thomas Bland, Paul Tackley, Paul K. Byrne
Ageing of organic materials at the surface of Mars: A Raman study aboard Perseverance
The Perseverance rover is exploring Jezero crater on Mars, one of its goals being to collect samples to be returned to Earth to search for organic remains of ancient Martian life. However, the organic content of these rocks has likely suffered from the radiation environment on the surface of Mars to an extent yet to be quantified. For the first time, a 1000 sols long ageing experiment...
Authors
S. Bernard, Olivier Beyssac, J.A. Manrique, G. Lopez Reyes, A. Ollila, S. Le Mouelic, P.S.A. Beck, Paolo Pilleri, O. Forni, S. Julve-Gonzales, M. Veneranda, I. Reyes Rodriguez, J.M. Madariaga Mota, J. Aramenda, K. Castro, Elise Clave, C. Royer, T. Fornaro, B. Bousquet, S.K. Sharma, J.R. Johnson, E. Cloutis, Travis S.J. Gabriel, P.Y. Meslin, Olivier Gasnault, Agnès Cousin, R.C. Wiens, S. Maurice
Lunar grid systems, coordinate systems, and map projections for the Artemis missions and lunar surface navigation
ForewardThis document contains design specifications of a navigational standard for the Moon, including a Lunar Transverse Mercator system, a Lunar Polar Stereographic system, a Lunar Grid Reference System, and a unique coordinate structure, Artemis Condensed Coordinates, for Artemis mission navigation and lunar surface science.The National Aeronautics and Space Administration (NASA)...
Authors
Mark T McClernan, Michael L. Dennis, Ike H. Theriot, Trent M. Hare, Brent A. Archinal, Lillian R. Ostrach, Marc A. Hunter, Matthew J. Miller, Ross A. Beyer, Andrew M. Annex, Samuel J. Lawrence
Phase 1 technical implementation plan for the expansion of the ShakeAlert earthquake early warning system to Alaska
Executive SummaryThe conference report accompanying the fiscal year (FY) 2022 Consolidated Appropriations Act (Public Law 117–103) for the U.S. Department of the Interior and related agencies directed the U.S. Geological Survey (USGS) to “work with the State of Alaska to develop an implementation plan to be completed within two years in order to put ShakeAlert/Earthquake Early Warning in...
Authors
Cecily J. Wolfe, Natalia A. Ruppert, Douglas D. Given, Michael E. West, Valerie I. Thomas, Jessica R. Murray, Ronni Grapenthin
Migration of seismicity from the mantle to the upper crust beneath Harrat Lunayyir volcanic field, Saudi Arabia
Harrat Lunayyir is a volcanic field in Saudi Arabia that experienced a Mw~5.4 earthquake driven by an upper-crustal dike intrusion in May 2009. This volcanic field has exhibited numerous forms of volcanic seismicity both prior to and since the 2009 dike intrusion. Significantly, earthquakes within the lithospheric mantle and, rarely, the lower crust are present in the two-decade long...
Authors
Alexander R. Blanchette, Simon L. Klemperer, Walter D. Mooney, Turki A. Sehli
Grfin Tools—User guide and methods for modeling landslide runout and debris-flow growth and inundation
The software package, Grfin Tools, can estimate potential runout from landslides or inundation from geophysical mass flows such as debris flows, lahars from volcanoes, and rock avalanches within a digital elevation model (DEM). Grfin is an acronym of growth + flow + inundation. The tools within this package apply simple, well-tested, empirical models of runout that are computationally...
Authors
Mark E. Reid, Dianne L. Brien, Collin Cronkite-Ratcliff, Jonathan P. Perkins
Implications of physics-based M9 ground motions on liquefaction-induced damage in the Cascadia Subduction Zone: Looking forward and backward
Given the likelihood of future M9 Cascadia Subduction Zone (CSZ) earthquakes, various estimates of the resulting, regional ground motions have been made, including a suite of 30 physics-based simulations that reflect key modeling uncertainties. However, because the last CSZ interface rupture occurred in 1700 CE, the shaking expected in such an event is especially uncertain, as are the...
Authors
Ryan A. Rasanen, Alex R.R. Grant, Andrew James Makdisi, Brett W. Maurer, Erin Wirth
Macroseismology
In this chapter I discuss the use of so-called macroseismic data, i.e., reports of damage and other effects of shaking on humans and the built environment, to improve the characterization of earthquakes and the ground motions they produce. Macroseismic data are critical not only to investigate earthquakes that occurred before the start of the instrumental era in seismology, but are also...
Authors
Susan E. Hough
Paleoseismology and paleogeodesy using coral microatolls
Establishing the rupture extent and slip distribution of individual paleo-earthquakes is vital for assessing fault behavior including the persistence of rupture segmentation, recurrence patterns, and similarity of successive events, key issues in both fault mechanics and hazard assessment. Techniques with high temporal and geodetic precision as well as a wide distribution of study sites...
Authors
Belle E. Philibosian
Remote single-station seismic monitoring of the July–October 2022 earthquake swarm at Tau volcano, American Samoa
From July to October 2022, a non-eruptive volcanic earthquake swarm occurred within ~15 km of Taʻū Island, located in eastern American Samoa. Felt reports from local residents were the only available information about the swarm when it started, as American Samoa lacked a seismic monitoring network. We developed a consistent single-station catalog for the entire swarm, using seismic data...
Authors
Clara Yoon, Robert John Skoumal, Andrew J. Michael, Arthur D. Jolly, Andria P. Ellis, Drew T. Downs, Peter Dotray, Natalia I. Deligne, Jefferson Chang, Ninfa Lucia Bennington, Aaron G. Wech, Matthew M. Haney, Alicia J. Hotovec-Ellis, Elinor Lutu-McMoore, Marcus Langkilde
A high-resolution 3-D P-wave velocity structure of the south-central Cascadia subduction zone from wide-angle shore-crossing seismic refraction data
This study addresses a significant gap in understanding the features of the south-central Cascadia subduction zone, a region characterized by complex geologic, tectonic, and seismic transitions both offshore and onshore. Unlike other segments along this margin, this area lacks a 3-D velocity model to delineate its structural and geological features on a fine scale. To address this void...
Authors
Asif Ashraf, Emilie Hooft, Douglas Toomey, Anne Trehu, Sarah Nolan, Erin Wirth, Kevin M. Ward
Crater detection dependence on resolution, incidence angle, emission angle, and phase angle
Impact crater population detection and measurement is critical to understanding solar system bodies and dynamics. However, the ability to detect all possible craters under different lighting and camera geometries has not been systematically studied except in a few limited cases. This work presents the first systematic study examining crater detection based on resolution, incidence angle...
Authors
Stuart J. Robbins, Michelle R. Kirchoff, Lillian R. Ostrach