Publications
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The Montaguto earth flow: nine years of observation and analysis The Montaguto earth flow: nine years of observation and analysis
This paper summarizes the methods, results, and interpretation of analyses carried out between 2006 and 2015 at the Montaguto earth flow in southern Italy. We conducted a multi-temporal analysis of earth-flow activity to reconstruct the morphological and structural evolution of the flow. Data from field mapping were combined with a geometric reconstruction of the basal slip surface
Authors
L. Guerriero, R Revellino, G. Grelle, N Diodato, F.M. Guadagno, Jeffrey A. Coe
The Elizabeth Lake paleoseismic site: Rupture pattern constraints for the past ~800 years for the Mojave section of the south-central San Andreas Fault The Elizabeth Lake paleoseismic site: Rupture pattern constraints for the past ~800 years for the Mojave section of the south-central San Andreas Fault
The southern San Andreas Fault in California has hosted two historic surface-rupturing earthquakes, the ~M7 1812 Wrightwood earthquake and the ~M7.9 1857 Fort Tejon earthquake (e.g., Sieh, 1978; Jacoby et al., 1988). Numerous paleoseismic studies have established chronologies of historic and prehistoric earthquakes at sites along the full length of the 1857 rupture (e.g., Sieh, 1978...
Authors
Sean Bemis, Katherine M. Scharer, James F. Dolan, Ed Rhodes
Field survey of earthquake effects from the magnitude 4.0 southern Maine earthquake of October 16, 2012 Field survey of earthquake effects from the magnitude 4.0 southern Maine earthquake of October 16, 2012
The magnitude 4.0 earthquake that occurred on October 16, 2012, near Hollis Center and Waterboro in southwestern Maine surprised and startled local residents but caused only minor damage. A two-person U.S. Geological Survey (USGS) team was sent to Maine to conduct an intensity survey and document the damage. The only damage we observed was the failure of a chimney and plaster cracks in...
Authors
Amy L. Radakovich, Alex J. Fergusen, John Boatwright
A fault-based model for crustal deformation, fault slip-rates and off-fault strain rate in California A fault-based model for crustal deformation, fault slip-rates and off-fault strain rate in California
We invert Global Positioning System (GPS) velocity data to estimate fault slip rates in California using a fault‐based crustal deformation model with geologic constraints. The model assumes buried elastic dislocations across the region using Uniform California Earthquake Rupture Forecast Version 3 (UCERF3) fault geometries. New GPS velocity and geologic slip‐rate data were compiled by...
Authors
Yuehua Zeng, Zheng-Kang Shen
Building a subduction zone observatory Building a subduction zone observatory
Subduction zones contain many of Earth’s most remarkable geologic structures, from the deepest oceanic trenches to glacier-covered mountains and steaming volcanoes. These environments formed through spectacular events: Nature’s largest earthquakes, tsunamis, and volcanic eruptions are born here.
Authors
Joan S. Gomberg, Paul Bodin, Jody Bourgeois, Susan Cashman, Darrel Cowan, Kenneth C. Creager, Brendan Crowell, Alison Duvall, Arthur D. Frankel, Frank I. Gonzalez, Heidi Houston, Paul Johnson, Harvey Kelsey, Una Miller, Emily C. Roland, David Schmidt, Lydia M. Staisch, John Vidale, William Wilcock, Erin Wirth
Differences in coastal subsidence in southern Oregon (USA) during at least six prehistoric megathrust earthquakes Differences in coastal subsidence in southern Oregon (USA) during at least six prehistoric megathrust earthquakes
Stratigraphic, sedimentologic (including CT 3D X-ray tomography scans), foraminiferal, and radiocarbon analyses show that at least six of seven abrupt peat-to-mud contacts in cores from a tidal marsh at Talbot Creek (South Slough, Coos Bay), record sudden subsidence (relative sea-level rise) during great megathrust earthquakes at the Cascadia subduction zone. Data for one contact are...
Authors
Yvonne Milker, Alan R. Nelson, Benjamin P. Horton, Simon E. Engelhart, Lee-Ann Bradley, Robert C. Witter
A possible transoceanic tsunami directed toward the U.S. west coast from the Semidi segment, Alaska convergent margin A possible transoceanic tsunami directed toward the U.S. west coast from the Semidi segment, Alaska convergent margin
The Semidi segment of the Alaska convergent margin appears capable of generating a giant tsunami like the one produced along the nearby Unimak segment in 1946. Reprocessed legacy seismic reflection data and a compilation of multibeam bathymetric surveys reveal structures that could generate such a tsunami. A 200 km long ridge or escarpment with crests >1 km high is the surface expression...
Authors
Roland E. von Huene, John J. Miller, Peter Dartnell
The potassic sedimentary rocks in Gale Crater, Mars, as seen by ChemCam Onboard Curiosity The potassic sedimentary rocks in Gale Crater, Mars, as seen by ChemCam Onboard Curiosity
The Mars Science Laboratory rover Curiosity encountered potassium-rich clastic sedimentary rocks at two sites in Gale Crater, the waypoints Cooperstown and Kimberley. These rocks include several distinct meters thick sedimentary outcrops ranging from fine sandstone to conglomerate, interpreted to record an ancient fluvial or fluvio-deltaic depositional system. From ChemCam Laser-Induced...
Authors
Laetitia Le Deit, Nicolas Mangold, Olivier Forni, Agnes Cousin, Jeremie Lasue, Susanne Schröder, Roger C. Wiens, Dawn Y. Sumner, Cecile Fabre, Katherine M. Stack, Ryan B. Anderson, Diana L. Blaney, Samuel M. Clegg, Gilles Dromart, Martin Fisk, Olivier Gasnault, John P. Grotzinger, Sanjeev Gupta, Nina Lanza, Stephane Le Mouelic, Sylvestre Maurice, Scott M. McLennan, Pierre-Yves Meslin, Marion Nachon, Horton E. Newsom, Valerie Payre, William Rapin, Melissa Rice, Violaine Sautter, Allan H. Treiman
Lithospheric flexure under the Hawaiian volcanic load: Internal stresses and a broken plate revealed by earthquakes Lithospheric flexure under the Hawaiian volcanic load: Internal stresses and a broken plate revealed by earthquakes
Several lines of earthquake evidence indicate that the lithospheric plate is broken under the load of the island of Hawai`i, where the geometry of the lithosphere is circular with a central depression. The plate bends concave downward surrounding a stress-free hole, rather than bending concave upward as with past assumptions. Earthquake focal mechanisms show that the center of load...
Authors
Fred W. Klein
Fluvial erosion as a mechanism for crater modification on Titan Fluvial erosion as a mechanism for crater modification on Titan
There are few identifiable impact craters on Titan, especially in the polar regions. One explanation for this observation is that the craters are being destroyed through fluvial processes, such as weathering, mass wasting, fluvial incision and deposition. In this work, we use a landscape evolution model to determine whether or not this is a viable mechanism for crater destruction on...
Authors
Catherine D. Neish, J. L. Molaro, J. M. Lora, A.D. Howard, Randolph L. Kirk, P. Schenk, V.J. Bray, R. D. Lorenz
The tectonics of Titan: Global structural mapping from Cassini RADAR The tectonics of Titan: Global structural mapping from Cassini RADAR
The Cassini RADAR mapper has imaged elevated mountain ridge belts on Titan with a linear-to-arcuate morphology indicative of a tectonic origin. Systematic geomorphologic mapping of the ridges in Synthetic Aperture RADAR (SAR) images reveals that the orientation of ridges is globally E–W and the ridges are more common near the equator than the poles. Comparison with a global topographic...
Authors
Zac Yung-Chun Liu, Jani Radebaugh, Ron A. Harris, Eric H. Christiansen, Catherine D. Neish, Randolph L. Kirk, Ralph D. Lorenz
Nature, distribution, and origin of Titan’s Undifferentiated Plains Nature, distribution, and origin of Titan’s Undifferentiated Plains
The Undifferentiated Plains on Titan, first mapped by Lopes et al. (Lopes, R.M.C. et al., 2010. Icarus, 205, 540–588), are vast expanses of terrains that appear radar-dark and fairly uniform in Cassini Synthetic Aperture Radar (SAR) images. As a result, these terrains are often referred to as “blandlands”. While the interpretation of several other geologic units on Titan – such as dunes...
Authors
Rosaly Lopes, M. J. Malaska, A. Solomonidou, Gall A. Le, M.A. Janssen, Catherine D. Neish, E. P. Turtle, S. P. D. Birch, A. G. Hayes, J. Radebaugh, A. Coustenis, A. Schoenfeld, B.W. Stiles, Randolph L. Kirk, K. L. Mitchell, E. R. Stofan, K. J. Lawrence