Publications
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Swarms of similar long-period earthquakes in the mantle beneath Mauna Loa Volcano
We present analyses of two swarms of long-period (LP) earthquakes at > 30 km depth that accompanied the geodetically observed 2002–2005 Mauna Loa intrusion. The first LP earthquake swarm in 2002 consisted of 31 events that were precursory and preceded the start of Mauna Loa inflation; the second LP swarm of two thousand events occurred from 2004–2005. The rate of LP earthquakes slowed significantl
Authors
Paul G. Okubo, C.J. Wolfe
Transient deterministic shallow landslide modeling: Requirements for susceptibility and hazard assessments in a GIS framework
Application of transient deterministic shallow landslide models over broad regions for hazard and susceptibility assessments requires information on rainfall, topography and the distribution and properties of hillside materials. We survey techniques for generating the spatial and temporal input data for such models and present an example using a transient deterministic model that combines an analy
Authors
J. W. Godt, R.L. Baum, W. Z. Savage, D. Salciarini, W.H. Schulz, E. L. Harp
Guidelines for landslide susceptibility, hazard and risk zoning for land use planning
[No abstract available]
Authors
R. Fell, J. Corominas, C. Bonnard, L. Cascini, E. Leroi, W. Z. Savage
Recent extreme avalanches: Triggered by climate change?
On 25 September 2008, seismo meters operated by the Alaska Volcano Observatory (AVO) registered strong ground shaking. On the basis of previous experience with such large seismic signals, AVO personnel were able to rapidly identify the seismic event as an avalanche. Two days later, an AVO overflight of Iliamna volcano, near Alaska's Cook Inlet, confirmed that a massive chunk of glacial ice and roc
Authors
C. Huggel, J. Caplan-Auerbach, Rick Wessels
Carbon dioxide of Pu`u`O`o volcanic plume at Kilauea retrieved by AVIRIS hyperspectral data
A remote sensing approach permits for the first time the derivation of a map of the carbon dioxide concentration in a volcanic plume. The airborne imaging remote sensing overcomes the typical difficulties associated with the ground measurements and permits rapid and large views of the volcanic processes together with the measurements of volatile components exolving from craters. Hyperspectral imag
Authors
C. Spinetti, V. Carrere, M. Fabrizia Buongiorno, A. J. Sutton, T. Elias
Degradation of Victoria crater, Mars
The ∼750 m diameter and ∼75 m deep Victoria crater in Meridiani Planum, Mars, is a degraded primary impact structure retaining a ∼5 m raised rim consisting of 1–2 m of uplifted rocks overlain by ∼3 m of ejecta at the rim crest. The rim is 120–220 m wide and is surrounded by a dark annulus reaching an average of 590 m beyond the raised rim. Comparison between observed morphology and that expected f
Authors
John A. Grant, Sharon A. Wilson, Barbara A. Cohen, Matthew P. Golombek, Paul E. Geissler, Robert J. Sullivan, Randolph L. Kirk, Timothy J. Parker
Seasonally active frost-dust avalanches on a north polar scarp of Mars captured by HiRISE
North-polar temporal monitoring by the High Resolution Imaging Science Experiment (HiRISE) orbiting Mars has discovered new, dramatic examples that Mars1 CO2-dominated seasonal volatile cycle is not limited to quiet deposition and sublimation of frost. In early northern martian spring, 2008, HiRISE captured several cases of CO2 frost and dust cascading down a steep, polar scarp in discrete clouds.
Authors
Patrick S. Russell, Nicolas Thomas, Shane Byrne, Kenneth E. Herkenhoff, Kathryn E. Fishbaugh, Nathan Bridges, Chris Okubo, Moses P. Milazzo, Ingrid J. Daubar, Candice J. Hansen, Alfred S. McEwen
Using amphibole phenocrysts to track vapor transfer during magma crystallization and transport: An example from Mount St. Helens, Washington
In order to evaluate and further constrain models for volatile movement and vapor enrichment of magma stored at shallow levels, amphibole phenocrysts from 2004–2005 Mount St. Helens dacite were analyzed for major and selected trace elements (Li, Cu, Zn, Mn, and REE) and Li isotopes. Several recent studies have examined fluid-mobile trace element abundances in phencryst phases and melt inclusions a
Authors
M.C. Rowe, A.J.R. Kent, C.R. Thornber
Joint NOAA/NWS/USGS prototype debris flow warning system for recently burned areas in Southern California
Debris flows, also known as mudslides, are composed gravity-driven mixtures of sediment and water that travel through steep channels, over open hillslopes, and the like. Addressing this issue, US Geological Survey (USGS) and NOAA have established a debris-flow warning system that has the ability to monitor and forecast precipitation and issue timely weather hazard warning. In 2005, this joint NOAA
Authors
P. Restrepo, D.P. Jorgensen, S.H. Cannon, J. Costa, J. Laber, Jon J. Major, B. Martner, J. Purpura, K. Werner
3D crustal structure and long-period ground motions from a M9.0 megathrust earthquake in the Pacific Northwest region
We have developed a community velocity model for the Pacific Northwest region from northern California to southern Canada and carried out the first 3D simulation of a Mw 9.0 megathrust earthquake rupturing along the Cascadia subduction zone using a parallel supercomputer. A long-period (
Authors
K.B. Olsen, W. J. Stephenson, A. Geisselmeyer
Recent bright gully deposits on Mars: Wet or dry flow?
Bright gully sediments attributed to liquid water flow have been deposited on Mars within the past several years. To test the liquid water flow hypothesis, we constructed a high-resolution (1 m/pixel) photogrammetric digital elevation model of a crater in the Centauri Montes region, where a bright gully deposit formed between 2001 and 2005. We conducted one-dimensional (1-D) and 2-D numerical flow
Authors
Jon D. Pelletier, Kelly J. Kolb, Alfred S. McEwen, Randolph L. Kirk
Titan's surface from the Cassini RADAR radiometry data during SAR mode
We present initial results on the calibration and interpretation of the high-resolution radiometry data acquired during the Synthetic Aperture Radar (SAR) mode (SAR-radiometry) of the Cassini Radar Mapper during its first five flybys of Saturn's moon Titan.We construct maps of the brightness temperature at the 2-cm wavelength coincident with SAR swath imaging. A preliminary radiometry calibration
Authors
F. Paganelli, M.A. Janssen, R.M. Lopes, E. Stofan, S. D. Wall, R. D. Lorenz, J. I. Lunine, Randolph L. Kirk, L. Roth, C. Elachi