Publications
Filter Total Items: 7492
Trimming a hazard logic tree with a new model-order-reduction technique Trimming a hazard logic tree with a new model-order-reduction technique
The size of the logic tree within the Uniform California Earthquake Rupture Forecast Version 3, Time-Dependent (UCERF3-TD) model can challenge risk analyses of large portfolios. An insurer or catastrophe risk modeler concerned with losses to a California portfolio might have to evaluate a portfolio 57,600 times to estimate risk in light of the hazard possibility space. Which branches of...
Authors
Keith Porter, Edward H. Field, Kevin R. Milner
Determination of earthquake magnitude for early warning from the time-dependence of P-wave amplitudes Determination of earthquake magnitude for early warning from the time-dependence of P-wave amplitudes
We propose a method that utilizes the time dependence of P‐wave displacement amplitudes to estimate the final magnitude (M) for earthquake early warning (EEW) before the arrival of the peak amplitude. A relation between M and P‐wave displacement amplitude is employed for the method. Its value is set as a function of time from the P arrival, and is determined using a K‐NET dataset...
Authors
Shunta Noda, William L. Ellsworth
A spatiotemporal clustering model for the Third Uniform California Earthquake Rupture Forecast (UCERF3‐ETAS): Toward an operational earthquake forecast A spatiotemporal clustering model for the Third Uniform California Earthquake Rupture Forecast (UCERF3‐ETAS): Toward an operational earthquake forecast
We, the ongoing Working Group on California Earthquake Probabilities, present a spatiotemporal clustering model for the Third Uniform California Earthquake Rupture Forecast (UCERF3), with the goal being to represent aftershocks, induced seismicity, and otherwise triggered events as a potential basis for operational earthquake forecasting (OEF). Specifically, we add an epidemic‐type...
Authors
Edward H. Field, Kevin R. Milner, Jeanne L. Hardebeck, Morgan T. Page, Nicholas van der Elst, Thomas H. Jordan, Andrew J. Michael, Bruce E. Shaw, Maximillan J. Werner
Subsurface geometry of the San Andreas fault in southern California: Results from the Salton Seismic Imaging Project (SSIP) and strong ground motion expectations Subsurface geometry of the San Andreas fault in southern California: Results from the Salton Seismic Imaging Project (SSIP) and strong ground motion expectations
The San Andreas fault (SAF) is one of the most studied strike‐slip faults in the world; yet its subsurface geometry is still uncertain in most locations. The Salton Seismic Imaging Project (SSIP) was undertaken to image the structure surrounding the SAF and also its subsurface geometry. We present SSIP studies at two locations in the Coachella Valley of the northern Salton trough. On our...
Authors
Gary S. Fuis, Klaus Bauer, Mark R. Goldman, Trond Ryberg, Victoria E. Langenheim, Daniel S. Scheirer, Michael J. Rymer, Joann M. Stock, John A. Hole, Rufus D. Catchings, Robert Graves, Brad T. Aagaard
Geomagnetically induced currents: Science, engineering, and applications readiness Geomagnetically induced currents: Science, engineering, and applications readiness
This paper is the primary deliverable of the very first NASA Living With a Star Institute Working Group, Geomagnetically Induced Currents (GIC) Working Group. The paper provides a broad overview of the current status and future challenges pertaining to the science, engineering, and applications of the GIC problem. Science is understood here as the basic space and Earth sciences research...
Authors
Antti Pulkkinen, E. Bernabeu, A. Thomson, A. Viljanen, R. Pirjola, D. Boteler, J. Eichner, P.J. Cilliers, D. Welling, N.P. Savani, R.S. Weigel, Jeffrey J. Love, Christopher Balch, C.M. Ngwira, G. Crowley, Adam Schultz, R. Kataoka, B. Anderson, D. Fugate, J.J. Simpson, M. MacAlester
Real-time geomagnetic monitoring for space weather-related applications: Opportunities and challenges Real-time geomagnetic monitoring for space weather-related applications: Opportunities and challenges
An examination is made of opportunities and challenges for enhancing global, real-time geomagnetic monitoring that would be beneficial for a variety of operational projects. This enhancement in geomagnetic monitoring can be attained by expanding the geographic distribution of magnetometer stations, improving the quality of magnetometer data, increasing acquisition sampling rates...
Authors
Jeffrey J. Love, Carol Finn
Geomorphology of comet 67P/Churyumov–Gerasimenko Geomorphology of comet 67P/Churyumov–Gerasimenko
We present a global geomorphological map of comet 67P/Churyumov–Gerasimenko (67P/C-G) using data acquired by the Rosetta Orbiter’s OSIRIS Narrow Angle Camera. The images used in our study were acquired between 2014 August and 2015 May, before 67P/C-G passed through perihelion. Imagery of the Southern hemisphere was included in our study, allowing us to compare the contrasting hemispheres...
Authors
Samuel P. D. Birch, Y. Tang, A. G. Hayes, Randolph L. Kirk, D. Bodewitz, H. Campins, Y. Fernandez, R. de Freitas Bart, N. W. Kutsop, H. Sierks, J. M. Soderblom, S. W. Squyres, J.-B. Vincent
Rigorously valuing the role of coral reefs in coastal protection: An example from Maui, Hawaii, U.S.A. Rigorously valuing the role of coral reefs in coastal protection: An example from Maui, Hawaii, U.S.A.
The degradation of coastal habitats, particularly coral reefs, raises risks by exposing communities to flooding hazards. The protective services of these natural defenses are not assessed in the same rigorous, economic terms as artificial defenses such as seawalls, and therefore often not considered in decision-making. Here we present a new methodology that combines economic, ecological...
Authors
Curt D. Storlazzi, Borja G. Reguero, Erik Lowe, James B. Shope, Ann E. Gibbs, Mike Beck, Barry A. Nickel
Designing a solution to enable agency-academic scientific collaboration for disasters Designing a solution to enable agency-academic scientific collaboration for disasters
As large-scale environmental disasters become increasingly frequent and more severe globally, people and organizations that prepare for and respond to these crises need efficient and effective ways to integrate sound science into their decision making. Experience has shown that integrating nongovernmental scientific expertise into disaster decision making can improve the quality of the...
Authors
Lindley A. Mease, Theodora Gibbs-Plessl, Ashley Erickson, K. A. Ludwig, Christopher M. Reddy, Jane Lubchenco
Influence of lithostatic stress on earthquake stress drops in North America Influence of lithostatic stress on earthquake stress drops in North America
We estimate stress drops for earthquakes in and near the continental United States using the method of spectral ratios. The ratio of acceleration spectra between collocated earthquakes recorded at a given station removes the effects of path and recording site and yields source parameters including corner frequency for, and the ratio of seismic moment between, the two earthquakes. We...
Authors
Oliver S. Boyd, Daniel E. McNamara, Stephen H. Hartzell, George Choy
Towards a planetary spatial data infrastructure Towards a planetary spatial data infrastructure
Planetary science is the study of planets, moons, irregular bodies such as asteroids and the processes that create and modify them. Like terrestrial sciences, planetary science research is heavily dependent on collecting, processing and archiving large quantities of spatial data to support a range of activities. To address the complexity of storing, discovering, accessing, and utilizing...
Authors
Jason Laura, Trent M. Hare, Lisa R. Gaddis, Robin L. Fergason, Skinner, Justin Hagerty, Brent A. Archinal
Shaler: in situ analysis of a fluvial sedimentary deposit on Mars Shaler: in situ analysis of a fluvial sedimentary deposit on Mars
This paper characterizes the detailed sedimentology of a fluvial sandbody on Mars for the first time and interprets its depositional processes and palaeoenvironmental setting. Despite numerous orbital observations of fluvial landforms on the surface of Mars, ground-based characterization of the sedimentology of such fluvial deposits has not previously been possible. Results from the NASA...
Authors
Lauren A. Edgar, Sanjeev Gupta, David M. Rubin, Kevin W. Lewis, Gary A. Kocurek, Ryan B. Anderson, James F. Bell, Gilles Dromart, Kenneth S. Edgett, John P. Grotzinger, Craig Hardgrove, Linda C. Kah, Richard A. LeVeille, Michael C. Malin, Nicholas Mangold, Ralph E. Milliken, Michelle Minitti, Marisa C. Palucis, Melissa Rice, Scott K. Rowland, Juergen Schieber, Kathryn M. Stack, Dawn Y. Sumner, Roger C. Wiens, Rebecca M.E. Williams, Amy J. Williams