Publications
Filter Total Items: 7494
Seismic analysis of the 2020 Magna, Utah, earthquake sequence: Evidence for a listric Wasatch fault Seismic analysis of the 2020 Magna, Utah, earthquake sequence: Evidence for a listric Wasatch fault
The 18 March 2020 Mw 5.7 Magna earthquake near Salt Lake City, Utah, offers a rare glimpse into the subsurface geometry of the Wasatch fault system—one of the world's longest active normal faults and a major source of seismic hazard in northern Utah. We analyze the Magna earthquake sequence and resolve oblique-normal slip on a shallow (30–35°) west-dipping fault at ~9- to 12-km depth...
Authors
Guanning Pang, Keith D. Koper, Maria Messimeri, Kristine L. Pankow, Ben Baker, Jamie Farrell, James Holt, J. Mark Hale, Paul B. Robertson, Relu Burlacu, James C. Pechmann, Katherine Whidden, Monique M. Holt, Amir Allam, Christopher DuRoss
Earthquake information products and tools from the Advanced National Seismic System (ANSS) Earthquake information products and tools from the Advanced National Seismic System (ANSS)
This Fact Sheet describes post-earthquake products and tools provided by the Advanced National Seismic System (ANSS) through the U.S. Geological Survey Earthquake Hazards Program. The focus is on products that provide situational awareness immediately after significant earthquakes.
Authors
Lisa A. Wald
Sediment export and impacts associated with river delta channelization compound estuary vulnerability to sea-level rise, Skagit River Delta, Washington, USA Sediment export and impacts associated with river delta channelization compound estuary vulnerability to sea-level rise, Skagit River Delta, Washington, USA
Improved understanding of the budget and retention of sediment in river deltas is becoming increasingly important to mitigate and plan for impacts expected with sea level rise. In this study, analyses of historical bathymetric change, sediment core stratigraphy, and modeling are used to evaluate the sediment budget and environmental response of the largest river delta in the U.S. Pacific...
Authors
Eric E. Grossman, Andrew W. Stevens, Peter Dartnell, Doug A George, David Finlayson
Forecasting for a fractured land: A case study of the communication and use of aftershock forecasts from the Mw 7.8 2016 Kaikōura earthquake in Aotearoa New Zealand Forecasting for a fractured land: A case study of the communication and use of aftershock forecasts from the Mw 7.8 2016 Kaikōura earthquake in Aotearoa New Zealand
Operational earthquake forecasts (OEFs) are represented as time‐dependent probabilities of future earthquake hazard and risk. These probabilities can be presented in a variety of formats, including tables, maps, and text‐based scenarios. In countries such as Aotearoa New Zealand, the U.S., and Japan, OEFs have been released by scientific organizations to agencies and the public, with the...
Authors
Julia S. Becker, Sally H. Potter, Sara K. McBride, Emma E. Hudson-Doyle, Matthew Gerstenberger, Anne-Marie Christopherson
The effects of phosphatization on the mineral associations and speciation of Pb in ferromanganese crusts The effects of phosphatization on the mineral associations and speciation of Pb in ferromanganese crusts
The older layers of thick ferromanganese (FeMn) crusts from the central Pacific Ocean have undergone diagenetic phosphatization, during which carbonate fluorapatite (CFA) filled fractures and pore space and replaced carbonates. The effects of phosphatization on individual trace metal concentrations, speciation, and phase associations in FeMn crusts remain poorly understood yet may be...
Authors
Kira Mizell, James R. Hein, Andrea Koschinsky, Sarah M. Hayes
Mars orbiter for resources, ices, and environments (MORIE) Mars orbiter for resources, ices, and environments (MORIE)
The MORIE mission concept study examined the science and technical trade space to address high priority questions related to ice reservoirs and environmental transitions. The study team converged on a medium-class SEP-enabled orbiter with seven instruments to unlock the extent and volume of subsurface ice and geologic sequence stratigraphy through time. Observations would include the...
Authors
Wendy M. Calvin, Nathaniel E. Putzig, John W Holt, Ali M Bramson, Colin M. Dundas, Bethany L. Ehlmann, Briony H. N. Horgan, Gareth A Morgan, Scott L. Murchie, G Wesley Patterson, Kimberly D. Seelos, Hanna G Sizemore, Steve Matousek, Ryan Woolley, Carlos Brinoccolo, Valerie Scott, Cassie Stuurman, Kevin Wheeler, Brian Sutin, Marc Lane, Nathan Barba, Ivair Gontijo, Katherine Park, Mariko Burgin, Scott Hensley, Jan Martin, Jean Biancone, David Hinkle, Barbara Insua
Exposure of an early to middle Noachian valley network in three dimensions on Mars Exposure of an early to middle Noachian valley network in three dimensions on Mars
We document a set of channels in a section of the Martian cratered highlands located between crustal massifs northeast of Hellas Planitia that are visible in cross section and planview >200 m below the surface. The morphometry and spatial distribution of the outcrops provide concrete geological evidence of a dynamic aqueous system in a structural sub-basin during the Early to Middle...
Authors
James A. Skinner, Corey M. Fortezzo, Peter J. Mouginis-Mark
Compositional layering in Io driven by magmatic segregation and volcanism Compositional layering in Io driven by magmatic segregation and volcanism
The compositional evolution of volcanic bodies like Io is not well understood. Magmatic segregation and volcanic eruptions transport tidal heat from Io's interior to its surface. Several observed eruptions appear to be extremely high temperature (≥ 1600 K), suggesting either very high degrees of melting, refractory source regions, or intensive viscous heating on ascent. To address this...
Authors
Dan C Spencer, Richard F. Katz, Ian J. Hewitt, David A. May, Laszlo P. Keszthelyi
Developing post-alert messaging for ShakeAlert, the earthquake early warning system for the West Coast of the United States of America Developing post-alert messaging for ShakeAlert, the earthquake early warning system for the West Coast of the United States of America
As ShakeAlert, the earthquake early warning system for the West Coast of the U.S., begins its transition to operational public alerting, we explore how post-alert messaging might represent system performance. Planned post-alert messaging can provide timely, crucial information to both emergency managers and ShakeAlert operators as well as calibrate expectations among various publics or...
Authors
Sara K. McBride, Ann Bostrom, Jeannette Sutton, Robert Michael deGroot, Annemarie S. Baltay Sundstrom, Brian Terbush, Paul Bodin, Maximilian Dixon, Emily Holland, Ryan Arba, Paul C. Laustsen, Sophia Liu, Margaret J. Vinci
Measuring basal force fluctuations of debris flows using seismic recordings and empirical green's functions Measuring basal force fluctuations of debris flows using seismic recordings and empirical green's functions
We present a novel method for measuring the fluctuating basal normal and shear stresses of debris flows by using along‐channel seismic recordings. Our method couples a simple parameterization of a debris flow as a seismic source with direct measurements of seismic path effects using empirical Green's functions generated with a force hammer. We test this method using two large‐scale (8...
Authors
Kate E. Allstadt, Maxime Farin, Richard M. Iverson, Maciej Obryk, Jason W. Kean, Victor C. Tsai, Thomas D Rapstine, Matthew Logan
Hydrothermal alteration on composite volcanoes: Mineralogy, hyperspectral imaging and aeromagnetic study of Mt Ruapehu, New Zealand Hydrothermal alteration on composite volcanoes: Mineralogy, hyperspectral imaging and aeromagnetic study of Mt Ruapehu, New Zealand
Prolonged volcanic activity can induce surface weathering and hydrothermal alteration that is a primary control on edifice instability, posing a complex hazard with its challenges to accurately forecast and mitigate. This study uses a frequently active composite volcano, Mt Ruapehu, New Zealand, to develop a conceptual model of surface weathering and hydrothermal alteration applicable to...
Authors
Gabor Kereszturi, Lauren N. Schaefer, Craig A. Miller, Stuart Mead
Evaluating stereo DTM quality at Jezero Crater, Mars with HRSC, CTX, and HiRISE images Evaluating stereo DTM quality at Jezero Crater, Mars with HRSC, CTX, and HiRISE images
We have used a high-precision, high-resolution digital terrain model (DTM) of the NASA Mars 2020 rover Perseverance landing site in Jezero crater based on mosaicked images from the Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment (MRO HiRISE) camera as a reference dataset to evaluate DTMs based on Mars Express High Resolution Stereo Camera (MEX HRSC) and MRO Context...
Authors
Randolph L. Kirk, Robin L. Fergason, Bonnie L. Redding, Donna M. Galuszka, Ethan Smith, David Mayer, Trent M. Hare, Klaus Gwinner