Publications
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Coupling of Indo-Pacific climate variability over the last millennium Coupling of Indo-Pacific climate variability over the last millennium
The Indian Ocean Dipole (IOD) impacts climate and rainfall across the world, and most severely in nations surrounding the Indian Ocean1-4. The frequency and intensity of positive IOD events increased during the 20th Century5 and may continue to intensify in a warming world6; however, confidence in future IOD changes is limited by known biases in model representations of the IOD7 and the...
Authors
Nerilie J. Abram, Nicky M. Wright, Bethany Ellis, Bronwyn C. Dixon, Jennifer B. Wurtzel, Matthew H. England, Caroline C. Ummenhofer, Belle E. Philibosian, Sri Yudawati Cahyarini, Tsai-Luen Yu, Chuan-Chou Shen, Hai Cheng, R. Lawrence Edwards, David Heslop
An analysis of the factors that control fault zone architecture and the importance of fault orientation relative to regional stress An analysis of the factors that control fault zone architecture and the importance of fault orientation relative to regional stress
The moment magnitude 7.2 El Mayor−Cucapah (EMC) earthquake of 2010 in northern Baja California, Mexico produced a cascading rupture that propagated through a geometrically diverse network of intersecting faults. These faults have been exhumed from depths of 6−10 km since the late Miocene based on low-temperature thermochronology, synkinematic alteration, and deformational fabrics...
Authors
John Fletcher, Orlando Teran, Tom Rockwell, Michael E. Oskin, Kenneth W. Hudnut, Ronald Spelz, Pierre Lacan, Mathew Dorsey, Giles Ostermijer, Thomas M. Mitchell, Sinan Akciz, Ana Paula Hernandez-Flores, Alejandro Hinojosa-Corona, Ivan Pena-Villa, David K. Lynch
Evidence for late Quaternary deformation along Crowley's Ridge, New Madrid seismic zone Evidence for late Quaternary deformation along Crowley's Ridge, New Madrid seismic zone
The New Madrid seismic zone has been the source of multiple major (M ~7.0–7.5) earthquakes in the past 2 ka, yet the surface expression of recent deformation remains ambiguous. Crowleys Ridge, a linear ridge trending north‐south for 300+ km through the Mississippi Embayment, has been interpreted as either a fault‐bounded uplift or a nontectonic erosional remnant. New and previously...
Authors
Jessica Thompson Jobe, Ryan D. Gold, Richard W. Briggs, Robert Williams, William J. Stephenson, Jaime E. Delano, Anjana K. Shah, Burke J. Minsley
Geodetic measurements of slow slip events southeast of Parkfield, CA Geodetic measurements of slow slip events southeast of Parkfield, CA
Tremor and low-frequency earthquakes are presumed to be indicative of surrounding slow, aseismic slip that is often below geodetic detection thresholds. This study uses data from borehole seismometers and long-baseline laser strainmeters to observe both the seismic and geodetic signatures of episodic tremor and slip on the Parkfield region of the San Andreas Fault near Cholame, CA. The...
Authors
Brent G. Delbridge, Joshua D. Carmichael, Robert M. Nadeau, David R. Shelly, Roland Burgmann
Operational earthquake forecasting during the 2019 Ridgecrest, California, earthquake sequence with the UCERF3-ETAS model Operational earthquake forecasting during the 2019 Ridgecrest, California, earthquake sequence with the UCERF3-ETAS model
The first Uniform California Earthquake Rupture Forecast, Version 3–epidemic‐type aftershock sequence (UCERF3‐ETAS) aftershock simulations were running on a high‐performance computing cluster within 33 min of the 4 July 2019 M 6.4 Searles Valley earthquake. UCERF3‐ETAS, an extension of the third Uniform California Earthquake Rupture Forecast (UCERF3), is the first comprehensive, fault...
Authors
Kevin R. Milner, Edward H. Field, William H Savran, Morgan T. Page, Thomas H Jordan
Planetary sensor models interoperability using the community sensor model specification Planetary sensor models interoperability using the community sensor model specification
This paper presents the photogrammetric foundations upon which the Community Sensor Model specification depends, describes common coordinate system and reference frame transformations that support conversion between image sensor (charge‐coupled device) coordinates to some arbitrary body coordinate, and describes the U.S. Geological Survey Astrogeology Community Sensor Model...
Authors
Jason Laura, Jesse Mapel, Trent M. Hare
Near-field ground motions from the July, 2019 Ridgecrest, California, earthquake sequence Near-field ground motions from the July, 2019 Ridgecrest, California, earthquake sequence
The 2019 Ridgecrest, California, earthquake sequence, including an Mw 6.4 event on 4 July and an Mw 7.1 approximately 34 hr later, was recorded by 15 instruments within 55 km nearest‐fault distance. To characterize and explore near‐field ground motions from the Mw 6.4 foreshock and Mw 7.1 mainshock, we augment these records with available macroseismic information, including conventional
Authors
Susan E. Hough, Eric M. Thompson, Grace A. Parker, Robert Graves, Kenneth W. Hudnut, Jason Patton, Timothy E. Dawson, Tyler C. Ladinsky, Michael Oskin, Krittanon Sirorattanakul, Kelly Blake, Annemarie S. Baltay Sundstrom, Elizabeth S. Cochran
A machine learning approach to developing ground motion models from simulated ground motions A machine learning approach to developing ground motion models from simulated ground motions
We use a machine learning approach to build a ground motion model (GMM) from a synthetic database of ground motions extracted from the Southern California CyberShake study. An artificial neural network is used to find the optimal weights that best fit the target data (without overfitting), with input parameters chosen to match that of state-of-the-art GMMs. We validate our synthetic...
Authors
Kyle Withers, Morgan P. Moschetti, Eric M. Thompson
Preparing for geophysical science on the surface of the moon enabled by Artemis Preparing for geophysical science on the surface of the moon enabled by Artemis
Geophysical methods have been extremely successful in identifying resources on Earth as they provide a means of characterizing and mapping the sub-surface using data gathered on and above the target structures. Geophysics on the Moon will be an important tool for identifying key targets for geological prospecting, scientific sampling, assessing hazards and risks to crew and...
Authors
Nicholas Schmerr, Jacob A. Richardson, R. Ghent, Matt Seigler, Molly Wasser, Patrick Wheeley, D. Buczkowski, Lynne Carter, Chuck Connor, Laura Connor, Jacob E. Bleacher, M. Fouch, D. Baker, T. Hurford, L. Jozwiak, Sarah Kruse, V. Lekic, A. Naids, Ryan Porter, L. Montesi, Derek Richardson, M. Elise Rumpf, J. Sunshine, Norbert Schorghofer, S. Goossens, Nicole Whelley, D. Wyrick, W. Zhu, Ernie Bell, J. DeMartini, D. Coan, D. Akin, Barbara Cohen, E. Mazarico, Clive Neal, M. Panning, Noah Petro, B. Strauss, Renee Weber, T. Glotch, A. Hendrix, A. Parker, Sarah Wright
Structural control on megathrust rupture and slip behavior: Insights from the 2016 Mw 7.8 Pedernales Ecuador earthquake Structural control on megathrust rupture and slip behavior: Insights from the 2016 Mw 7.8 Pedernales Ecuador earthquake
The heterogeneous seafloor topography of the Nazca Plate as it enters the Ecuador subduction zone provides an opportunity to document the influence of seafloor roughness on slip behavior and megathrust rupture. The 2016 Mw 7.8 Pedernales Ecuador earthquake was followed by a rich and active postseismic sequence. An internationally coordinated rapid response effort installed a temporary...
Authors
Lillian Soto-Cordero, Anne Meltzer, Eric A. Bergman, Mariah Hoskins, Joshua C. Stachnik, Hans Agurto-Detzel, Alexandra Alvarado, Susan L. Beck, Philippe Charvis, Yvonne Font, Gavin P. Hayes, Stephen Hernandez, Sergio Leon-Rios, Colton Lynner, Jean-Mathieu Nocquet, Marc Regnier, Andreas Rietbrock, Frederique Rolandone, Mario Ruiz
Mapping metabolic activity at single cell resolution in intact volcanic fumarole soil Mapping metabolic activity at single cell resolution in intact volcanic fumarole soil
Interactions among microorganisms and their mineralogical substrates govern the structure, function, and emergent properties of microbial communities. These interactions are predicated on spatial relationships, which dictate metabolite exchange and access to key substrates. To quantitatively assess links between spatial relationships and metabolic activity, this study presents a novel...
Authors
Jeffrey J. Marlow, Isabella Colocci, Sean Jungbluth, Nils Moritz Weber, Amy Gartman, Jens Kallmeyer
The 2019 Ridgecrest, California, earthquake sequence ground motions: Processed records and derived intensity metrics The 2019 Ridgecrest, California, earthquake sequence ground motions: Processed records and derived intensity metrics
Following the 2019 Ridgecrest, California, earthquake sequence, we compiled ground‐motion records from multiple data centers and processed these records using newly developed ground‐motion processing software that performs quality assurance checks, performs standard time series processing steps, and computes a wide range of ground‐motion metrics. In addition, we compute station and...
Authors
John Rekoske, Eric M. Thompson, Morgan P. Moschetti, Mike Hearne, Brad T. Aagaard, Grace Alexandra Parker