Publications
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Geomagnetic observations on tristan da cunha, south atlantic ocean Geomagnetic observations on tristan da cunha, south atlantic ocean
Few geomagnetic ground observations exist of the Earth's strongest core field anomaly, the South Atlantic Anomaly (SAA). The geomagnetic repeat station on the island Tristan da Cunha, located half-way between South Africa and South America at 37?? 05' S, 12?? 18' W, is therefore of crucial importance. We have conducted several sets of repeat station measurements during magnetically quiet
Authors
J. Matzka, N. Olsen, C.F. Maule, L.W. Pedersen, A.M. Berarducci, S. Macmillan
Developing framework to constrain the geometry of the seismic rupture plane on subduction interfaces a priori - A probabilistic approach Developing framework to constrain the geometry of the seismic rupture plane on subduction interfaces a priori - A probabilistic approach
A key step in many earthquake source inversions requires knowledge of the geometry of the fault surface on which the earthquake occurred. Our knowledge of this surface is often uncertain, however, and as a result fault geometry misinterpretation can map into significant error in the final temporal and spatial slip patterns of these inversions. Relying solely on an initial hypocentre and...
Authors
G.P. Hayes, D.J. Wald
The increasing wildfire and post-fire debris-flow threat in western USA, and implications for consequences of climate change The increasing wildfire and post-fire debris-flow threat in western USA, and implications for consequences of climate change
In southern California and the intermountain west of the USA, debris flows generated from recently-burned basins pose significant hazards. Increases in the frequency and size of wildfires throughout the western USA can be attributed to increases in the number of fire ignitions, fire suppression practices, and climatic influences. Increased urbanization throughout the western USA...
Authors
Susan H. Cannon, Jerry DeGraff
Test of a method to calculate near-bank velocity and boundary shear stress Test of a method to calculate near-bank velocity and boundary shear stress
No abstract available.
Authors
Jason W. Kean, Roger A. Kuhnle, J. Dungan Smith, Carlos V. Alonso, Eddy J. Langendoen
Landslide movement in southwest Colorado triggered by atmospheric tides Landslide movement in southwest Colorado triggered by atmospheric tides
Landslides are among the most hazardous of geological processes, causing thousands of casualties and damage on the order of billions of dollars annually. The movement of most landslides occurs along a discrete shear surface, and is triggered by a reduction in the frictional strength of the surface. Infiltration of water into the landslide from rainfall and snowmelt and ground motion from
Authors
W.H. Schulz, J. W. Kean, G. Wang
Timing of occurrence of large submarine landslides on the Atlantic Ocean margin Timing of occurrence of large submarine landslides on the Atlantic Ocean margin
Submarine landslides are distributed unevenly both in space and time. Spatially, they occur most commonly in fjords, active river deltas, submarine canyon-fan systems, the open continental slope and on the flanks of oceanic volcanic islands. Temporally, they are influenced by the size, location, and sedimentology of migrating depocenters, changes in seafloor pressures and temperatures...
Authors
H.J. Lee
Basal-topographic control of stationary ponds on a continuously moving landslide Basal-topographic control of stationary ponds on a continuously moving landslide
The Slumgullion landslide in the San Juan Mountains of southwestern Colorado has been moving for at least the last few hundred years and has multiple ponds on its surface. We have studied eight ponds during 30 trips to the landslide between July 1998 and July 2007. During each trip, we have made observations on the variability in pond locations and water levels, taken ground-based...
Authors
J. A. Coe, J.P. McKenna, J. W. Godt, R.L. Baum
New research and tools lead to improved earthquake alerting protocols New research and tools lead to improved earthquake alerting protocols
What’s the best way to get alerted about the occurrence and potential impact of an earthquake? The answer to that question has changed dramatically of late, in part due to improvements in earthquake science, and in part by the implementation of new research in the delivery of earthquake information
Authors
David J. Wald
Hydrodynamic modeling of tsunamis from the Currituck landslide Hydrodynamic modeling of tsunamis from the Currituck landslide
Tsunami generation from the Currituck landslide offshore North Carolina and propagation of waves toward the U.S. coastline are modeled based on recent geotechnical analysis of slide movement. A long and intermediate wave modeling package (COULWAVE) based on the non-linear Boussinesq equations are used to simulate the tsunami. This model includes procedures to incorporate bottom friction...
Authors
E.L. Geist, P.J. Lynett, J.D. Chaytor
Elements of an improved model of debris-flow motion Elements of an improved model of debris-flow motion
A new depth-averaged model of debris-flow motion describes simultaneous evolution of flow velocity and depth, solid and fluid volume fractions, and pore-fluid pressure. Non-hydrostatic pore-fluid pressure is produced by dilatancy, a state-dependent property that links the depth-averaged shear rate and volumetric strain rate of the granular phase. Pore-pressure changes caused by shearing...
Authors
R.M. Iverson
Preliminary investigation of some large landslides triggered by the 2008 Wenchuan earthquake, Sichuan Province, China Preliminary investigation of some large landslides triggered by the 2008 Wenchuan earthquake, Sichuan Province, China
The M s 8.0 Wenchuan earthquake or "Great Sichuan Earthquake" occurred at 14:28 p.m. local time on 12 May 2008 in Sichuan Province, China. Damage by earthquake-induced landslides was an important part of the total earthquake damage. This report presents preliminary observations on the Hongyan Resort slide located southwest of the main epicenter, shallow mountain surface failures in...
Authors
F. Wang, Q. Cheng, L. Highland, M. Miyajima, Hongfang Wang, C. Yan
On the reported magnetic precursor of the 1989 Loma Prieta earthquake On the reported magnetic precursor of the 1989 Loma Prieta earthquake
Among the most frequently cited reports in the science of earthquake prediction is that by Fraser-Smith et al. (1990) and Bernardi et al. (1991). They found anomalous enhancement of magnetic-field noise levels prior to the 18 October 1989 Loma Prieta earthquake in the ultra-low-frequency range (0.0110-10.001 Hz) from a ground-based sensor at Corralitos, CA, just 7 km from the earthquake...
Authors
J.N. Thomas, J.J. Love, M.J.S. Johnston