Publications
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Gas and isotope chemistry of thermal features in Yellowstone National Park, Wyoming
This report presents 130 gas analyses and 31 related water analyses on samples collected from thermal features at Yellowstone between 2003 and 2009. An overview of previous studies of gas emissions at Yellowstone is also given. The analytical results from the present study include bulk chemistry of gases and waters and isotope values for water and steam (delta18O, dealtaD), carbon dioxide (delta13
Authors
D. Bergfeld, Jacob B. Lowenstern, Andrew G. Hunt, W.C. Pat Shanks, William Evans
Shallow degassing events as a trigger for very-long-period seismicity at Kilauea Volcano, Hawaii
The first eruptive activity at Kīlauea Volcano’s summit in 25 years began in March 2008 with the opening of a 35-m-wide vent in Halema‘uma‘u crater. The new activity has produced prominent very-long-period (VLP) signals corresponding with two new behaviors: episodic tremor bursts and small explosive events, both of which represent degassing events from the top of the lava column. Previous work has
Authors
Matthew R. Patrick, David C. Wilson, David Fee, Tim R. Orr, Don Swanson
Monitoring CO2 emissions in tree kill areas near the resurgent dome at Long Valley Caldera, California
We report results of yearly measurements of the diffuse CO2 flux and shallow soil temperatures collected since 2006 across two sets of tree-kill areas at Long Valley Caldera, California. These data provide background information about CO2 discharge during a period with moderate seismicity, but little to no deformation. The tree kills are located at long-recognized areas of weak thermal fluid upflo
Authors
D. Bergfeld, William C. Evans
Selected Images of the Effects of the October 15, 2006, Kiholo Bay-Mahukona, Hawai'i, Earthquakes and Recovery Efforts
Early on the morning of October 15, 2006, two moderate earthquakes—the largest in decades—struck the Island of Hawai‘i. The first of these, which occurred at 7:07 a.m., HST (1707 UTC), was a magnitude (M) 6.7 earthquake, centered beneath Kīholo Bay on the northwestern coast of the island (19.878°N, 155.935°W), at a depth of 39 km. The second earthquake, which struck 6 minutes, 24 seconds later, at
Authors
Taeko Jane Takahashi, Nancy A. Ikeda, Paul G. Okubo, Maurice K. Sako, David C. Dow, Anna M. Priester, Nolan A. Steiner
Estimate of tephra accumulation probabilities for the U.S. Department of Energy's Hanford Site, Washington
In response to a request from the U.S. Department of Energy, we estimate the thickness of tephra accumulation that has an annual probability of 1 in 10,000 of being equaled or exceeded at the Hanford Site in south-central Washington State, where a project to build the Tank Waste Treatment and Immobilization Plant is underway. We follow the methodology of a 1987 probabilistic assessment of tephra a
Authors
Richard P. Hoblitt, William E. Scott
Enhanced Late Holocene ENSO/PDO expression along the margins of the eastern North Pacific
Pacific climate is known to have varied during the Holocene, but spatial patterns remain poorly defined. This paper compiles terrestrial and marine proxy data from sites along the northeastern Pacific margins and proposes that they indicate 1) suppressed ENSO conditions during the middle Holocene between ∼8000 and 4000 cal BP with a North Pacific that generally resembled a La Niña-like or more neg
Authors
John A. Barron, Lesleigh Anderson
2008 Volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, and volcanic unrest or suspected unrest at seven separate volcanic centers in Alaska during 2008. Significant explosive eruptions at Okmok and Kasatochi Volcanoes in July and August dominated Observatory operations in the summer and autumn. AVO maintained 24-hour staffing at the Anchorage facility from July 12 through
Authors
Christina A. Neal, Robert G. McGimsey, James P. Dixon, Cheryl E. Cameron, Anton A. Nuzhdaev, Marina Chibisova
Sutter Buttes: The lone volcano in California's Great Valley
The volcanic spires of the Sutter Buttes tower 2,000 feet above the farms and fields of California's Great Valley, just 50 miles north-northwest of Sacramento and 11 miles northwest of Yuba City. The only volcano within the valley, the Buttes consist of a central core of volcanic domes surrounded by a large apron of fragmental volcanic debris. Eruptions at the Sutter Buttes occurred in early Pleis
Authors
Brian P. Hausback, L. J. Patrick Muffler, Michael A. Clynne
Publications of the Volcano Hazards Program 2009
The Volcano Hazards Program of the U.S. Geological Survey (USGS) is part of the Geologic Hazards Assessments subactivity as funded by congressional appropriation. Investigations are carried out in the USGS and with cooperators at the Alaska Division of Geological and Geophysical Surveys, University of Alaska Fairbanks Geophysical Institute, University of Hawaii Manoa and Hilo, University of Utah,
Authors
Manuel Nathenson
Bibliography of literature pertaining to Long Valley Caldera and associated volcanic fields
On May 25-27, 1980, Long Valley caldera was rocked by four M=6 earthquakes that heralded the onset of a wave of seismic activity within the caldera which has continued through the present. Unrest has taken the form of seismic swarms, uplift of the resurgent dome, and areas of vegetation killed by increased CO2 emissions, all interpreted as resulting from magma injection into different levels benea
Authors
John W. Ewert, Christopher J. Harpel, Suzanna K. Brooks, Mae Marcaida
Spatiotemporal evolution of dike opening and décollement slip at Kīlauea Volcano, Hawai'i
Rapid changes in ground tilt and GPS positions on Kīlauea Volcano, Hawai'i, are interpreted as resulting from a shallow, two‐segment dike intrusion into the east rift zone that began at 1217 UTC (0217 HST) on 17 June 2007 and lasted almost 3 days. As a result of the intrusion, a very small volume of basalt (about 1500 m3) erupted on 19 June. Northward tilt at a coastal tiltmeter, subsidence of sou
Authors
Emily K. Montgomery-Brown, D. K. Sinnett, K.M. Larson, Michael P. Poland, P. Segall, Asta Miklius
Volcanology curricula development aided by online educational resource
Volcanic activity is an excellent hook for engaging college and university students in geoscience classes. An increasing number of Internet-accessible real-time and near–real time volcano monitoring data are now available and constitute an important resource for geoscience education; however, relatively few data sets are comprehensive, and many lack background information to aid in interpretation.
Authors
Michael P. Poland, Katrien J. van der Hoeven Kraft, Rachel Teasdale