Publications
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River floods under wetter antecedent conditions deliver coarser sediment to the coast River floods under wetter antecedent conditions deliver coarser sediment to the coast
Increasing hydrologic volatility—more extreme rain, and larger variations between wet and dry years—has become apparent in some regions, but few data exist to determine how intensifying hydrologic extremes affect sedimentary systems. Using uniquely high-resolution records of fluvial suspended sediment and coastal morphology, we quantify sedimentary responses from a steep, 357-km2...
Authors
Amy E. East, Alexander G. Snyder, Andrew W. Stevens, Jonathan A. Warrick, David J. Topping, Matthew A. Thomas, Andrew C. Ritchie
Pediment formation and subsequent erosion in Gale crater: Clues to the climate history of Mars Pediment formation and subsequent erosion in Gale crater: Clues to the climate history of Mars
Evidence of paleo-rivers, fans, deltas, lakes, and channel networks across Mars has prompted much debate about what climate conditions would permit the formation of these surface water derived features. Pediments, gently sloping erosional surfaces of low relief developed in bedrock, have also been identified on Mars. On Earth, these erosional landforms, often thought to be created by...
Authors
A.B. Bryk, W.E. Dietrich, Kristen A. Bennett, V.K. Fox, C.M. Fedo, M.P. Lamb, E.S. Kite, L.M. Thompson, S. G. Banham, J. Schieber, J.A. Grant, A.R. Vasavada, A.A. Fraeman, Lauren A. Edgar, P. J. Gasda, R. C. Wiens, J.P. Grotzinger, K. Stack-Morgan, R.E. Arvidson, Olivier Gasnault, S. Le Mouelic, S. Gupta, R.M.E. Williams, R.Y. Sheppard, K.W. Lewis, D.M. Rubin, W. Rapin, M.N. Hughes, M. Turner, S.A. Wilson, J.M. Davis, R.E. Kronyak, L. Le Deit, L.C. Kah, J. Frydenvang, R.J. Sullivan, C.C. Bedford, E. Dehouck, H.E. Newsom, M.C. Malin
Seismic intensities, ground motions and basin amplification from the 2022 Mw 6.4 Ferndale, California intraslab earthquake Seismic intensities, ground motions and basin amplification from the 2022 Mw 6.4 Ferndale, California intraslab earthquake
On December 20, 2022, a Mw 6.4 earthquake occurred at a depth of 18 km within the subducting Gorda plate in the Mendocino Triple Junction (MTJ), one of the most seismically active regions of the contiguous United States, causing widespread damage to local communities. Here we document the seismic intensities, ground motions, and basin amplification effects recorded by this earthquake...
Authors
Leyla Mariam Namazie, Rebecca Medley, Walter D. Mooney
The 2014–2015 Holuhraun lava flow-field in Iceland as a planetary analog for young volcanic terrains in Elysium Planitia, Mars The 2014–2015 Holuhraun lava flow-field in Iceland as a planetary analog for young volcanic terrains in Elysium Planitia, Mars
Elysium Planitia is the youngest volcanic terrain on Mars, and the only region that exhibits evidence of ongoing magmatic activity today. This makes Elysium Planitia crucial for understanding the tectonic, magmatic, volcanic, and thermal state of the planet. The 2014–2015 Holuhraun eruption in the Icelandic Highland provides a unique opportunity to study a large-volume, fissure-fed...
Authors
Joana R.C. Voigt, Christopher W. Hamilton, Laszlo P. Keszthelyi, M. Varnam, S.M. Hibbard, K. M. Stack
The GorDAS Distributed Acoustic Sensing experiment above the Cascadia locked zone and subducted Gorda Slab The GorDAS Distributed Acoustic Sensing experiment above the Cascadia locked zone and subducted Gorda Slab
The southernmost portion of the Cascadia Subduction zone in Northern California produces high rates of moderate and large earthquakes owing to subduction of the Gorda slab and deformation associated with the Mendocino Triple Junction. Distributed Acoustic Sensing (DAS) is rapidly advancing as a method for detecting earthquakes and imaging crustal structure. We have begun a long-term DAS...
Authors
Jeffrey J. McGuire, Andrew J. Barbour, Connie Stewart, Victor Yartsev, Martin Karrenbach, Mark Hemphill-Haley, Robert C. McPherson, Kari Stockdale, Clara Yoon, Theresa Marie Sawi
No magmatic driving force for Europan sea-floor volcanism 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 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, O. Beyssac, J.A. Manrique, G. Lopez Reyes, A. Ollila, S. Le Mouelic, P.S.A. Beck, P. Pilleri, O. Forni, S. Julve-Gonzales, M. Veneranda, I. Reyes Rodriguez, J.M. Madariaga Mota, J. Aramenda, K. Castro, Elise Clavé, C. Royer, T. Fornaro, B. Bousquet, S.K. Sharma, J.R. Johnson, E. Cloutis, Travis S.J. Gabriel, P.Y. Meslin, Olivier Gasnault, A. Cousin, R. C. Wiens, S. Maurice
Lunar grid systems, coordinate systems, and map projections for the Artemis missions and lunar surface navigation Lunar grid systems, coordinate systems, and map projections for the Artemis missions and lunar surface navigation
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 Phase 1 technical implementation plan for the expansion of the ShakeAlert earthquake early warning system to Alaska
Authors
Cecily J. Wolfe, Natalia A. Ruppert, Douglas D. Given, Michael E. West, Valerie Thomas, Jessica R. Murray, Ronni Grapenthin
Migration of seismicity from the mantle to the upper crust beneath Harrat Lunayyir volcanic field, Saudi Arabia 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 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
Earthquake stress drop, source spectra from laboratory experiments, and the apparent unsteadiness of frictional slip Earthquake stress drop, source spectra from laboratory experiments, and the apparent unsteadiness of frictional slip
Over a range of co-seismic total energy release, high sample rate slip, stress, and slip velocity measurements were made during frictional failure to determine seismic source properties. The near-field measurements were used to estimate stress drops using spectral approaches that are analogous to the standard seismological moment-corner determined Δσ and acceleration amplitude Δσarms...
Authors
Brian D. Kilgore, Nicholas M. Beeler