Publications
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Quiescent deformation of the Aniakchak Caldera, Alaska mapped by InSAR Quiescent deformation of the Aniakchak Caldera, Alaska mapped by InSAR
The 10-km-wide caldera of the historically active Aniakchak volcano, Alaska, subsides ∼13 mm/yr, based on data from 19 European Remote Sensing Satellite (ERS-1 and ERS-2) interferometric synthetic aperture radar (InSAR) images from 1992 through 2002. The pattern of subsidence does not reflect the distribution of pyroclastic deposits from the last eruption in 1931 and therefore is not...
Authors
Oh-Ig Kwoun, Zhong Lu, Christina A. Neal, Charles W. Wicks
Geodetic observations and modeling of magmatic inflation at the Three Sisters volcanic center, central Oregon Cascade Range, USA Geodetic observations and modeling of magmatic inflation at the Three Sisters volcanic center, central Oregon Cascade Range, USA
Tumescence at the Three Sisters volcanic center began sometime between summer 1996 and summer 1998 and was discovered in April 2001 using interferometric synthetic aperture radar (InSAR). Swelling is centered about 5 km west of the summit of South Sister, a composite basaltic-andesite to rhyolite volcano that last erupted between 2200 and 2000 yr ago, and it affects an area ∼20 km in...
Authors
Daniel Dzurisin, Michael Lisowski, Charles W. Wicks, Michael P. Poland, Elliot T. Endo
Real-time measurement of volcanic SO2 emissions: Validation of a new UV correlation spectrometer (FLYSPEC) Real-time measurement of volcanic SO2 emissions: Validation of a new UV correlation spectrometer (FLYSPEC)
A miniaturized, lightweight and low-cost UV correlation spectrometer, the FLYSPEC, has been developed as an alternative for the COSPEC, which has long been the mainstay for monitoring volcanic sulfur dioxide fluxes. Field experiments have been conducted with the FLYSPEC at diverse volcanic systems, including Masaya (Nicaragua), Poás (Costa Rica), Stromboli, Etna and Vulcano (Italy)...
Authors
Keith A. Horton, Glyn Williams-Jones, Harold Garbeil, Tamar Elias, A. Jeff Sutton, Peter J. Mouginis-Mark, John T. Porter, Steven Clegg
Differences in tsunami generation between the December 26, 2004 and March 28, 2005 Sumatra earthquakes Differences in tsunami generation between the December 26, 2004 and March 28, 2005 Sumatra earthquakes
Source parameters affecting tsunami generation and propagation for the Mw > 9.0 December 26, 2004 and the Mw = 8.6 March 28, 2005 earthquakes are examined to explain the dramatic difference in tsunami observations. We evaluate both scalar measures (seismic moment, maximum slip, potential energy) and finite-source repre-sentations (distributed slip and far-field beaming from finite source...
Authors
E.L. Geist, S.L. Bilek, D. Arcas, V.V. Titov
Landslides triggered by the 2004 Niigata Ken Chuetsu, Japan, earthquake Landslides triggered by the 2004 Niigata Ken Chuetsu, Japan, earthquake
The Niigata Ken Chuetsu earthquake triggered a vast number of lanslides in the epicentral region. Landslide concentrations were among the highest ever measured after an earthquake, and most of the triggered landslides were relatively shallow failures parallel to the steep slope faces. The dense concentration of landslides can be attributed to steep local topography in relatively weak...
Authors
D.S. Kieffer, R. Jibson, E.M. Rathje, K. Kelson
Sustained long-period seismicity at Shishaldin Volcano, Alaska Sustained long-period seismicity at Shishaldin Volcano, Alaska
From September 1999 through April 2004, Shishaldin Volcano, Aleutian Islands, Alaska, exhibited a continuous and extremely high level of background seismicity. This activity consisted of many hundreds to thousands of long-period (LP; 1–2 Hz) earthquakes per day, recorded by a 6-station monitoring network around Shishaldin. The LP events originate beneath the summit at shallow depths (0–3...
Authors
Tanja Petersen, Jacqueline Caplan-Auerbach, Stephen R. McNutt
Migration of the Pee Dee River system inferred from ancestral paleochannels underlying the South Carolina Grand Strand and Long Bay inner shelf Migration of the Pee Dee River system inferred from ancestral paleochannels underlying the South Carolina Grand Strand and Long Bay inner shelf
Several generations of the ancestral Pee Dee River system have been mapped beneath the South Carolina Grand Strand coastline and adjacent Long Bay inner shelf. Deep boreholes onshore and high-resolution seismic-reflection data offshore allow for reconstruction of these paleochannels, which formed during glacial lowstands, when the Pee Dee River system incised subaerially exposed coastal...
Authors
W. E. Baldwin, R.A. Morton, T.R. Putney, M.P. Katuna, M.S. Harris, P. T. Gayes, N. W. Driscoll, J. F. Denny, W. C. Schwab
Quaternary fans and terraces in the Khumbu Himal south of Mount Everest: their characteristics, age and formation Quaternary fans and terraces in the Khumbu Himal south of Mount Everest: their characteristics, age and formation
Large fans and terraces are frequent in the Khumbu Himal within the high Himalayan valleys south of Mt. Everest. These features are composed of massive matrix- and clast-supported diamicts that were formed from both hyperconcentrated flows and coarse-grained debris flows. Cosmogenic radionuclide (CRN) exposure ages for boulders on fans and terraces indicate that periods of fan and...
Authors
P.L. Barnard, L.A. Owen, R.C. Finkel
The 2005 La Conchita, California, landslide The 2005 La Conchita, California, landslide
[No abstract available]
Authors
R.W. Jibson
Spirit rover localization and topographic mapping at the landing site of Gusev crater, Mars Spirit rover localization and topographic mapping at the landing site of Gusev crater, Mars
By sol 440, the Spirit rover has traversed a distance of 3.76 km (actual distance traveled instead of odometry). Localization of the lander and the rover along the traverse has been successfully performed at the Gusev crater landing site. We localized the lander in the Gusev crater using two-way Doppler radio positioning and cartographic triangulations through landmarks visible in both...
Authors
Rongxing Li, Brent A. Archinal, Raymond E. Arvidson, Jim Bell, Phillip R. Christensen, Larry S. Crumpler, David J. Des Marais, Kaichang Di, Tom Duxbury, Matthew P. Golombek, John Grant, Ronald Greeley, Joe Guinn, Aaron H. Johnson, Randolph L. Kirk, Mark Maimone, Larry H. Matthies, Michael Malin, Timothy Parker, Michael H. Sims, Shane D. Thompson, Steven W. Squyres, Laurence A. Soderblom
Argon geochronology of Kilauea's early submarine history Argon geochronology of Kilauea's early submarine history
Submarine alkalic and transitional basalts collected by submersible along Kilauea volcano's south flank represent early eruptive products from Earth's most active volcano. Strongly alkalic basalt fragments sampled from volcaniclastic deposits below the mid-slope Hilina Bench yield 40Ar/39Ar ages from 212 ± 38 to 280 ± 20 ka. These ages are similar to high-precision 234 ± 9 and 239 ± 10...
Authors
Andrew T. Calvert, Marvin A. Lanphere
Carbon dioxide emissions from vegetation-kill zones around the resurgent dome of Long Valley caldera, eastern California, USA Carbon dioxide emissions from vegetation-kill zones around the resurgent dome of Long Valley caldera, eastern California, USA
A survey of diffuse CO2 efflux, soil temperature and soil-gas chemistry over areas of localized vegetation-kill on and around the resurgent dome of Long Valley caldera California was performed to evaluate the premise that gaseous and thermal anomalies are related to renewed intrusion of magma. Some kill sites are long-lived features and others have developed in the past few years. Total...
Authors
Deborah Bergfeld, William C. Evans, James F. Howle, Christopher D. Farrar