Publications
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Earthquake waveform similarity and evolution at Augustine Volcano from 1993 to 2006: Chapter 5 in The 2006 eruption of Augustine Volcano, Alaska
Temporal changes in waveform characteristics and earthquake locations associated with the 2006 Augustine eruption and preeruptive seismicity provide constraints on eruptive processes within the edifice. Volcano-tectonic earthquakes occur within the upper 1 to 2 km at Augustine between and during eruptive cycles, and we use the Alaska Volcano Observatory hypocenter and waveform catalog from 1993 to
Authors
Heather R. DeShon, Clifford H. Thurber, John A. Power
Encounters of aircraft with volcanic ash clouds: A compilation of known incidents, 1953-2009
Information about reported encounters of aircraft with volcanic ash clouds from 1953 through 2009 has been compiled to document the nature and scope of risks to aviation from volcanic activity. The information, gleaned from a variety of published and other sources, is presented in database and spreadsheet formats; the compilation will be updated as additional encounters occur and as new data and c
Authors
Marianne Guffanti, Thomas J. Casadevall, Karin Budding
Magma flux at Okmok Volcano, Alaska, from a joint inversion of continuous GPS, campaign GPS, and interferometric synthetic aperture radar
Volcano deformation is usually measured using satellite geodetic techniques including interferometric synthetic aperture radar (InSAR), campaign GPS, and continuous GPS. Differences in the spatial and temporal sampling of each system mean that most appropriate inversion scheme to determine the source parameters from each data set is different. Most studies either compare results from independent i
Authors
Juliet Biggs, Zhong Lu, T. Fournier, Jeffrey T. Freymueller
Low‐productivity Hawaiian volcanism between Kaua‘i and O‘ahu
The longest distance between subaerial shield volcanoes in the Hawaiian Islands is between the islands of Kaua‘i and O‘ahu, where a field of submarine volcanic cones formed astride the axis of the Hawaiian chain during a period of low magma productivity. The submarine volcanoes lie ∼25–30 km west of Ka‘ena Ridge that extends ∼80 km from western O‘ahu. These volcanoes were sampled by three Jason2 d
Authors
A. Greene, Michael O. Garcia, Dominique Weis, Garrett Ito, Maia Kuga, Joel Robinson, Seiko Yamasaki
The role of water in generating the calc-alkaline trend: New volatile data for aleutian magmas and a new tholeiitic index
The origin of tholeiitic (TH) versus calc-alkaline (CA) magmatic trends has long been debated. Part of the problem stems from the lack of a quantitative measure for the way in which a magma evolves. Recognizing that the salient feature in many TH–CA discrimination diagrams is enrichment in Fe during magma evolution, we have developed a quantitative index of Fe enrichment, the Tholeiitic Index (THI
Authors
Mindy M. Zimmer, Terry Plank, Erik H. Hauri, Gene Yogodzinski, Peter L. Stelling, Jessica Larsen, Brad Singer, Brian R. Jicha, Charlie Mandeville, Christopher J. Nye
Cyclic ground tilt associated with the 2004–2008 eruption of Mount St. Helens
The long‐term behavior of the 2004–2008 effusive eruption of Mount St. Helens was characterized by a gradual decline in the rates of seismicity, dome growth, and broad‐scale ground deformation, but shallow near‐periodic “drumbeat” earthquakes over timescales of minutes indicated episodic short‐term behavior. In part to better characterize this behavior and any associated ground deformation, a netw
Authors
K. Anderson, Michael Lisowski, P. Segall
High‐resolution locations of triggered earthquakes and tomographic imaging of Kilauea Volcano's south flank
The spatiotemporal patterns of seismicity beneath Kilauea's south flank give insight to the structure and geometry of the decollement on which large, tsunamigenic earthquakes have occurred, and its relation to slow slip events (SSEs), which have been observed every 1 to 2 years since 1997. In order to record earthquakes triggered by a SSE that was predicted to occur in March 2007, a temporary netw
Authors
Ellen M. Syracuse, Clifford H. Thurber, Cecily Wolfe, Paul G. Okubo, James H. Foster, Benjamin A. Brooks
Carbon dioxide dangers demonstration model
Carbon dioxide is a dangerous volcanic gas. When carbon dioxide seeps from the ground, it normally mixes with the air and dissipates rapidly. However, because carbon dioxide gas is heavier than air, it can collect in snowbanks, depressions, and poorly ventilated enclosures posing a potential danger to people and other living things. In this experiment we show how carbon dioxide gas displaces oxyge
Authors
Dina Venezky, Stephen Wessells
Caldera demonstration model
A caldera is a large, usually circular volcanic depression formed when magma is withdrawn or erupted from a shallow underground magma reservoir. It is often difficult to visualize how calderas form. This simple experiment using flour, a balloon, tubing, and a bicycle pump, provides a helpful visualization for caldera formation.
Authors
Dina Venezky, Stephen Wessells
Proceedings of the 24th Pacific climate workshop (PACLIM): Introduction
No abstract available.
Authors
Scott W. Starratt
Photographic documentation of the evolution of Crater Glacier, Mount St. Helens, Washington, September 2006–November 2009
Lava-dome emplacement through a glacier was observed for the first time during the 2004-08 eruption of Mount St. Helens and documented using photography, photogrammetry, and geodetic measurements. Previously published reports present such documentation through September 2006; this report extends that documentation until November 2009.
Authors
Joseph S. Walder, Steven P. Schilling, David R. Sherrod, James W. Vallance
Database for the geologic map of the Bend 30- x 60-minute quadrangle, central Oregon
The Bend 30- x 60-minute quadrangle has been the locus of volcanism, faulting, and sedimentation for the past 35 million years. It encompasses parts of the Cascade Range and Blue Mountain geomorphic provinces, stretching from snowclad Quaternary stratovolcanoes on the west to bare rocky hills and sparsely forested juniper plains on the east. The Deschutes River and its large tributaries, the Metol
Authors
Richard D. Koch, David W. Ramsey, David R. Sherrod, Edward M. Taylor, Mark L. Ferns, William E. Scott, Richard M. Conrey, Gary A. Smith