Publications
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Correlation of porosity variations and rheological transitions on the southern Cascadia megathrust Correlation of porosity variations and rheological transitions on the southern Cascadia megathrust
The unknown onshore extent of megathrust earthquake rupture in the Cascadia subduction zone represents a key uncertainty in earthquake hazard for the Pacific Northwest that is governed by the physical state and mechanical properties of the plate interface. The Cascadia plate interface is segmented into an interseismically locked zone located primarily offshore that is expected to rupture...
Authors
Hao Guo, Jeffrey J. McGuire, Haijiang Zhang
Prehistoric earthquakes on the Banning strand of the San Andreas fault, North Palm Springs, California Prehistoric earthquakes on the Banning strand of the San Andreas fault, North Palm Springs, California
We studied a paleoseismic trench excavated in 2017 across the Banning strand of the San Andreas fault and herein provide the first detailed record of ground-breaking earthquakes on this important fault in Southern California. The trench exposed an ~40-m-wide fault zone cutting through alluvial sand, gravel, silt, and clay deposits. We evaluated the paleoseismic record using a new metric...
Authors
Bryan A. Castillo, Sally F. McGill, Katherine M. Scharer, Doug Yule, Devin McPhillips, James McNeil, Sourav Saha, Nathan D. Brown, Seulgi Moon
Structure and Qp-Qs relations in the Seattle and Tualatin basins from converted seismic phases Structure and Qp-Qs relations in the Seattle and Tualatin basins from converted seismic phases
We use converted body‐wave phases from local earthquakes to constrain depth to basement and average attenuation relations for the Seattle basin in Washington and the Tualatin basin in Oregon. P‐, P‐to‐S‐(Ps), S‐to‐P‐(Sp), and S‐wave arrivals are present in three‐component recordings of magnitude 2.5–4.0 earthquakes at seismic stations located in these basins. Based on their relative...
Authors
Ian Stone, Erin A. Wirth, Arthur D. Frankel
Postwildfire soil‐hydraulic recovery and the persistence of debris flow hazards Postwildfire soil‐hydraulic recovery and the persistence of debris flow hazards
Deadly and destructive debris flows often follow wildfire, but understanding of changes in the hazard potential with time since fire is poor. We develop a simulation‐based framework to quantify changes in the hydrologic triggering conditions for debris flows as postwildfire infiltration properties evolve through time. Our approach produces time‐varying rainfall intensity‐duration...
Authors
Matthew A. Thomas, Francis K. Rengers, Jason W. Kean, Luke A. McGuire, Dennis M. Staley, Katherine R. Barnhart, Brian A. Ebel
Horizontal-to-vertical spectral ratios from California sites: Open-source database and data interpretation to establish site parameters Horizontal-to-vertical spectral ratios from California sites: Open-source database and data interpretation to establish site parameters
Frequency-dependent horizontal-to-vertical spectral ratios (HVSR) of Fourier amplitudes from three-component recordings can provide information on one or more site resonant frequencies and relative levels of amplification at those frequencies. Such information is potentially useful for predicting site amplification but is not present in site databases that have been developed over the...
Authors
Pengfei Wang, Paolo Zimmaro, Tatiana Gospe, Sean Kamran Ahdi, Alan Yong, Jonathan P. Stewart
Mars science helicopter: Compelling science enabled by an aerial platform Mars science helicopter: Compelling science enabled by an aerial platform
This whitepaper describes two conceptual vehicle designs, including possible tradeoffs within those designs, which would enable a wide array of innovative science investigations. In addition to describing vehicle capabilities, flight characteristics, and the breadth of enabled science for the two helicopter designs, we also introduce three mission concepts that showcase investigations...
Authors
Jonathan Bapst, Timothy J Parker, J Balaram, T Tzanetos, L. H. Matthies, C D Edwards, Aaron Freeman, S Withrow-Maser, W. Carter Johnson, E Amador-French, Janice L. Bishop, Ingrid J. Daubar, Colin M. Dundas, Abigail A. Fraeman, Christopher W. Hamilton, C. Hardgrove, Briony H. N. Horgan, C. W. Leung, Y. Lin, A Mittelholz, B. P. Weiss
Aeolian processes and landforms across the Solar System: Science and technology requirements for the next decade Aeolian processes and landforms across the Solar System: Science and technology requirements for the next decade
Discussions of planetary atmospheric-surface interactions (including aeolian processes and phenomena and the resulting landforms) are often tied to a specific planetary body. Considering this, a series of workshops were initiated in 2008 to facilitate an interdisciplinary and interplanetary body approach to further our understanding of aeolian processes, phenomena, and landforms (Titus...
Authors
Timothy N. Titus, S. Diniega, L.K. Fenton, Lynn Neakrase, J. Nienhuis, J Radebaugh, Kaj E. Williams, James R. Zimbelman
Science and technology requirements to explore caves in our Solar System Science and technology requirements to explore caves in our Solar System
We are in the incipient phase of exploring the subterranean realm of our Solar System. Planetary caves research offers interdisciplinary, cross-planetary body investigations spanning geology, climatology, astrobiology, robotics, and human use. Caves are of great importance in advancing our understanding of planetary processes and the search for life beyond Earth. Given these advances, a...
Authors
Timothy N. Titus, Janna Wynne, P. J. Boston, P. de Leon, C. Demirel-Floyd, H Jones, Francesco Sauro, Kyle Uckert, Ali-akbar Agha-Mohammadi, E. Calvin Alexander, James W. Ashley, Armando Azua-Bustos, Leroy Chiao, Glen E. Cushing, J DeDecker, Alberto G. Fairen, A Frumkin, Jo de Waele, Gary L. Harris, Laura A. Kerber, Richard J. Leveille, Michael J. Malaska, Kavya Manyapu, Matteo Massironi, Ana Z. Miller, John E. Mylroie, Bogdan P. Onac, Scott Parazynski, Charity Phillips-Lander, Thomas Prettyman, Haley Sapers, Norbert Schorghofer, Dirk Schulze-Makuch, Red Whittaker, Kaj E. Williams, Uland Wong
Planetary defense preparedness: Identifying the potential for post-asteroid impact time delayed and geographically displaced hazards Planetary defense preparedness: Identifying the potential for post-asteroid impact time delayed and geographically displaced hazards
A considerable amount of effort has been done to quantify impact effects from the impact of an asteroid. The effects usually considered are: blast, overpressure shock, thermal radiation, cratering, seismic shaking, ejecta, and tsunami (e.g. Hills & Goda, 1993; Collins et al., 2005, Rumpf et al., 2017). These first-order effects typically are localized in time and diminish with increased...
Authors
Timothy N. Titus, D. G. Robertson, Joel B. Sankey
Solar-system-wide significance of Mars polar science Solar-system-wide significance of Mars polar science
1. The North Polar Layered Deposits contain thousands of ice layers that record accumulation and climate history for at least several million years, making the most accessible and most complete climate record aside from the Earth’s – and the only one to record the impact of large obliquity shifts. 2. Mars Polar Science is a diverse and integrated system spanning much of the planet, above...
Authors
I. B. Smith, Wendy M. Calvin, D. E. Smith, C. Hansen, S. Diniega, A.S. McEwen, N. Thomas, D. Banfield, Timothy N. Titus, P. Becerra, M. Kahre, F. Forget, M. Hecht, S. Byrne, C. S. Hvidberg, P. O. Hayne, J. W. Head III, M. Mellon, B. Horgan, J. Mustard, J. Holt, A. Howard, D. McCleese, C. Stoker, P. James, N. E. Putzig, J. Whitten, P. Buhler, A. Spiga, M. Crismani, K. M. Aye, A. Portyankina, R. Orosei, A. Bramson, J. Hanley, M. Sori, O. Aharonson, S. Clifford, H. Sizemore, G. Morgan, B. Hartmann, N. Schorghofer, R. Clark, D. Berman, D. Crown, F. Chuang, M. Siegler, E. N. Dobrea, K. Lynch, R. W. Obbard, M. R. Elmaary, D. Fisher, A. Kleinboehl, M. Balme, B. Schmitt, M. Daly, R. C. Ewing, Kenneth E. Herkenhoff, L. Fenton, S. D. Guzewich, M. Koutnik, J. Levy, R. Massey, A. Losiak, V. Eke, D. Goldsby, A. Cross, T. Hager, S. Piqueux, A Kereszturi, K. Seelos, S. Wood, E. Hauber, C. Amos, P. Russell, R. Jaumann, G. Michael, S. Conway, A. Khayat, S. Lewis, G. Luizzi, G. Martinez, K. Mesick, L. Montabone, Johnsson, A. Pankine, C. Phillips-Lander, P. Read, Lauren A. Edgar, K. Zacny, A. McAdam, A. Rutledge, T. Bertrand, J. Widmer, D. Stillman, A. Soto, Z. Yoldi, R. Young, A. Svensson, L. Sam, M. Landis, A. Bhardwaj, M. Chojnacki, E. Kite, P. Thomas, J. Plaut, J. Bapst, S. Milkovich, J. Whiteway, J. Moores, C. Rezza, R. Karimova, I. Mishev, A. Van Brenen, P. Acharya, J. Chesal, A. Pascuzzo, E. Vos, G. Osinski, C. Andres, C. Neisch, S. Hibbard, P. Sinha, J. P. Knightly, S. Cartwright, S. Kounaves, C. Orgel, M. Skidmore, J. MacGregor, R. Staehle, J. Rabassa, C. Gallagher, A. Coronato, A. G. Galofre, J. Wilson, L. McKeown, N. Oliveira, P. Fawdon, U. Gayathri, C. Stuurman, C. Herny, F. Butcher, F. Bernardini, M. Perry, R. Hu, S. Mukherjee, V. Chevrier, M. E. Banks, T. Meng, P. A. Johnson, B. Tober, J. C. Johnson, Ulamsec, J. C. Echaurren, A. Khuller, C. Dinwiddie, S. Adeli, B. L. Henderson, L. R. Lozano, D. Lalich, E. Rivera-Valentín, S. Nerozzi, E. Petersen, F. Foss, R. Lorenz, J. Eigenbrode, M. Day, A. Brown, M. Pajola, O. Karatekin, A. Lucchetti, C. Cesar, C. Newman, T. G. Cave, M. Mischna, M. Patel, P. Streeter, J. C. Stern, C. M. Dundas
Asteroid impacts - downwind and downstream effects Asteroid impacts - downwind and downstream effects
For this abstract, we have selected an impact location, consistent with the PDC2021 initial scenario [1], in the San Juan Mountains, in southwestern Colorado. This is a low-density population area but is part of the watershed system within the Colorado River basin, a major source for water and power for the southwestern United States. Several large cities and major airports are...
Authors
Timothy N. Titus, D. G. Robertson, Joel B. Sankey, Larry G. Mastin
The scientific rationale for deployment of a long-lived geophysical network on the Moon The scientific rationale for deployment of a long-lived geophysical network on the Moon
This white paper focuses on the scientific rationale for deploying a global, long-lived network of geophysical instruments on the surface of the Moon to understand the nature and evolution of the lunar interior from the crust to the core.
Authors
Renee Weber, Clive Neal, Robert E. Grimm, Matthias Grott, Nick Schmerr, Mark Wieczorek, James D. Williams, Bruce Banerdt, Caroline Beghein, Peter Chi, Douglas Currie, Simone Dell’Agnello, Jared Espley, Raphael Garcia, Ian Garrick-Bethell, Heidi Haviland, Stephen Indyk, Catherine L. Johnson, Taichi Kawamura, Sharon Kedar, Philippe Lognonne, Seiichi Nagihara, Yosio Nakamura, Ceri Nunn, Lillian R. Ostrach, Mark Panning, Noah E. Petro, Matthew A. Siegler, Thomas R. Watters, Kris Zacny, S. Hop Bailey, Maria Banks, Donald Barker, Hannes Bernhardt, Valentin Bickel, Joshua T. Cahill, Jackie Clark, Dani DellaGiustina, Jesse-Lee Dimech, Andrew Dombard, Catherine Elder, Lindy Elkins-Tanton, Marshall Eubanks, Kerri L. Donaldson Hanna, Jan Harms, Steve Hauck, Lon Hood, Jose Hurtado, Seth Jacobson, Devanshu Jha, James Tuttle Keane, Amir Khan, Walter Kiefer, Martin Knapmeyer, Brigitte Knapmeyer-Endrun, Krishan Khurana, Juan Manuel Lorenzo, Angela Marusiak, Patrick McGovern, Laurent Montesi, Francis Nimmo, Deanna Phillips, Jacob A. Richardson, Charles Shearer, Krista Soderlund, Sean C. Solomon, Tilman Spohn, Eleonore Stutzmann, Sonia Tikoo, Slava Turyshev, Dany Waller, Ryuhei Yamada, Maria Zuber