Publications
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Mapping of the Culann-Tohil region of Io from Galileo imaging data Mapping of the Culann-Tohil region of Io from Galileo imaging data
We have used Galileo spacecraft data to produce a geomorphologic map of the Culann–Tohil region of Io's antijovian hemisphere. This region includes a newly discovered shield volcano, Tsũi Goab Tholus and a neighboring bright flow field, Tsũi Goab Fluctus, the active Culann Patera and the enigmatic Tohil Mons-Radegast Patera–Tohil Patera complex. Analysis of Voyager global color and...
Authors
D.A. Williams, Paul M. Schenk, Jeffrey M. Moore, Laszlo P. Keszthelyi, Elizabeth Turtle, Windy Jaeger, Jani Radebaugh, Moses Milazzo, Rosaly Lopes, Ronald Greeley
Rhyodacites of Kulshan caldera, North Cascades of Washington: Postcaldera lavas that span the Jaramillo Rhyodacites of Kulshan caldera, North Cascades of Washington: Postcaldera lavas that span the Jaramillo
Kulshan caldera (4.5×8 km), at the northeast foot of Mount Baker, is filled with rhyodacite ignimbrite (1.15 Ma) and postcaldera lavas and is only the third Quaternary caldera identified in the Cascade arc. A gravity traverse across the caldera yields a steep-sided, symmetrical, complete Bouguer anomaly of −16 mGal centered over the caldera. Density considerations suggest that the...
Authors
W. Hildreth, M. Lanphere, D.E. Champion, J. Fierstein
Strain accumulation across the Coast Ranges at the latitude of San Francisco, 1994-2000 Strain accumulation across the Coast Ranges at the latitude of San Francisco, 1994-2000
A 66-monument geodetic array spanning the Coast Ranges near San Francisco has been surveyed more than eight times by GIPS between late 1993 and early 2001. The measured horizontal velocities of the monuments are well represented by uniform, right-lateral, simple shear parallel to N29°W. (The local strike of the San Andreas Fault is ∼N34°W.) The observed areal dilatation rate of 6.9 ± 10...
Authors
J.C. Savage, Weijun Gan, W.H. Prescott, J. Svarc
Crustal structure along the geosciences transect from Altay to Altun Tagh Crustal structure along the geosciences transect from Altay to Altun Tagh
No abstract available.
Authors
Y.-X. Wang, G.-H. Han, M. Jiang, X.-C. Yuan, Walter Mooney, R. Coleman
Dispersal scaling from the world's rivers Dispersal scaling from the world's rivers
Although rivers provide important biogeochemical inputs to oceans, there are currently no descriptive or predictive relationships of the spatial scales of these river influences. Our combined satellite, laboratory, field and modeling results show that the coastal dispersal areas of small, mountainous rivers exhibit remarkable self-similar scaling relationships over many orders of...
Authors
J.A. Warrick, D.A. Fong
Decompression experiments identify kinetic controls on explosive silicic eruptions Decompression experiments identify kinetic controls on explosive silicic eruptions
Eruption intensity is largely controlled by decompression‐induced release of water‐rich gas dissolved in magma. It is not simply the amount of gas that dictates how forcefully magma is propelled upwards during an eruption, but also the rate of degassing, which is partly a function of the supersaturation pressure (ΔPcritical) triggering gas bubble nucleation. High temperature and pressure
Authors
M. Mangan, T. Sisson, W.B. Hankins
Ultra-high chlorine in submarine Kı̄lauea glasses: Evidence for direct assimilation of brine by magma Ultra-high chlorine in submarine Kı̄lauea glasses: Evidence for direct assimilation of brine by magma
Basaltic glass grains from the submarine south flank of Kı̄lauea, Hawai′i, have Cl concentrations of 0.01–1.68 wt%, the latter being the highest Cl content yet recorded for a Hawaiian glass. The high-Cl glass grains are products of brine assimilation by tholeiite magma. The glasses are grains in a sandstone clast from bedded breccias draping the southwestern margin of Kı̄lauea’s...
Authors
Michelle Coombs, Thomas Sisson, Jun-Ichi Kimura
Role of a large marine protected area for conserving landscape attributes of sand habitats on Georges Bank (NW Atlantic) Role of a large marine protected area for conserving landscape attributes of sand habitats on Georges Bank (NW Atlantic)
Mobile fishing gear reduces seafloor habitat complexity through the removal of structure-building fauna, e.g. emergent organisms that create pits and burrows, as well as by smoothing of sedimentary bedforms (e.g. sand ripples). In this study, we compared the relative abundance of microhabitat features (the scale at which individual fish associate with seafloor habitat) inside and outside...
Authors
J. Lindholm, P. Auster, P. Valentine
Landslides triggered by the 2002 Denali fault, Alaska, earthquake and the inferred nature of the strong shaking Landslides triggered by the 2002 Denali fault, Alaska, earthquake and the inferred nature of the strong shaking
The 2002 M7.9 Denali fault, Alaska, earthquake triggered thousands of landslides, primarily rock falls and rock slides, that ranged in volume from rock falls of a few cubic meters to rock avalanches having volumes as great as 15 ?? 106 m3. The pattern of landsliding was unusual; the number of slides was less than expected for an earthquake of this magnitude, and the landslides were...
Authors
R.W. Jibson, E. Harp, W. Schulz, D. Keefer
The Spirit Rover's Athena science investigation at Gusev crater, Mars The Spirit Rover's Athena science investigation at Gusev crater, Mars
The Mars Exploration Rover Spirit and its Athena science payload have been used to investigate a landing site in Gusev crater. Gusev is hypothesized to be the site of a former take, but no clear evidence for lacustrine sedimentation has been found to date. Instead, the dominant lithology is basalt, and the dominant geologic processes are impact events and eolian transport. Many rocks...
Authors
S. Squyres, R. E. Arvidson, J.F. Bell, J. Bruckner, N.A. Cabrol, W. Calvin, M. Carr, P. Christensen, B.C. Clark, L. Crumpler, D.J. Des Marais, C. D'Uston, T. Economou, J. Farmer, W. Farrand, W. Folkner, M. Golombek, S. Gorevan, J. Grant, R. Greeley, J. Grotzinger, L. Haskin, Kenneth Herkenhoff, S. Hviid, J. Johnson, G. Klingelhofer, A. Knoll, G. Landis, M. Lemmon, R. Li, M.B. Madsen, M. Malin, S. McLennan, H.Y. McSween, D. Ming, J. Moersch, R.V. Morris, T. Parker, J. Rice, L. Richter, R. Rieder, M. Sims, M. Smith, P. Smith, Laurence Soderblom, R. Sullivan, H. Wanke, T. Wdowiak, M. Wolff, A. Yen
Radiated energy and the rupture process of the Denali fault earthquake sequence of 2002 from broadband teleseismic body waves Radiated energy and the rupture process of the Denali fault earthquake sequence of 2002 from broadband teleseismic body waves
Displacement, velocity, and velocity-squared records of P and SH body waves recorded at teleseismic distances are analyzed to determine the rupture characteristics of the Denali fault, Alaska, earthquake of 3 November 2002 (MW 7.9, Me 8.1). Three episodes of rupture can be identified from broadband (∼0.1–5.0 Hz) waveforms. The Denali fault earthquake started as a MW 7.3 thrust event...
Authors
G. Choy, J. Boatwright
The opportunity Rover's Athena science investigation at Meridiani Planum, Mars The opportunity Rover's Athena science investigation at Meridiani Planum, Mars
The Mars Exploration Rover Opportunity has investigated the landing site in Eagle crater and the nearby plains within Meridiani Planum. The soils consist of fine-grained basaltic sand and a surface lag of hematite-rich spherules, spherule fragments, and other granules. Wind ripples are common. Underlying the thin soil layer, and exposed within small impact craters and troughs, are flat...
Authors
S. Squyres, R. E. Arvidson, J.F. Bell, J. Bruckner, N.A. Cabrol, W. Calvin, M. Carr, P. Christensen, B.C. Clark, L. Crumpler, D.J. Des Marais, C. D'Uston, T. Economou, J. Farmer, W. Farrand, W. Folkner, M. Golombek, S. Gorevan, J. Grant, R. Greeley, J. Grotzinger, L. Haskin, Kenneth Herkenhoff, S. Hviid, J. Johnson, G. Klingelhofer, A.H. Knoll, G. Landis, M. Lemmon, R. Li, M.B. Madsen, M. Malin, S. McLennan, H.Y. McSween, D. Ming, J. Moersch, R.V. Morris, T. Parker, J. Rice, L. Richter, R. Rieder, M. Sims, M. Smith, P. Smith, Laurence Soderblom, R. Sullivan, H. Wanke, T. Wdowiak, M. Wolff, A. Yen