Publications
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Sun photometer and lidar measurements of the plume from the Hawaii Kilauea Volcano Pu'u O'o vent: Aerosol flux and SO2 lifetime Sun photometer and lidar measurements of the plume from the Hawaii Kilauea Volcano Pu'u O'o vent: Aerosol flux and SO2 lifetime
Aerosol optical depths and lidar measurements were obtained under the plume of Hawaii Kilauea Volcano on August 17, 2001, ∼9 km downwind from the erupting Pu'u O'o vent. Measured aerosol optical depths (at 500 nm) were between 0.2–0.4. Aerosol size distributions inverted from the spectral sun photometer measurements suggest the volcanic aerosol is present in the accumulation mode (0.1–0...
Authors
J.N. Porter, K.A. Horton, P. J. Mouginis-Mark, B. Lienert, S.K. Sharma, E. Lau, T. Elias, A. J. Sutton, C. Oppenheimer
A Holocene paleosecular variation from 14C-dated volcanic rocks in western North America A Holocene paleosecular variation from 14C-dated volcanic rocks in western North America
A paleosecular variation (PSV) curve for western North America is presented on the basis of 94 virtual geomagnetic poles (VGPs) from dated volcanic rocks sampled at 446 sites. Approximately 60% of the paleomagnetic database has been previously published. A curve defined by “spherical smoothed splines” is fitted to the VGPs, ranked by the quality of the age determinations, where the data...
Authors
Jonathan T. Hagstrum, Duane E. Champion
Fault structure and kinematics of the Long Valley Caldera region, California, revealed by high-accuracy earthquake hypocenters and focal mechanism stress inversions Fault structure and kinematics of the Long Valley Caldera region, California, revealed by high-accuracy earthquake hypocenters and focal mechanism stress inversions
We have determined high-resolution hypocenters for 45,000+ earthquakes that occurred between 1980 and 2000 in the Long Valley caldera area using a double-difference earthquake location algorithm and routinely determined arrival times. The locations reveal numerous discrete fault planes in the southern caldera and adjacent Sierra Nevada block (SNB). Intracaldera faults include a series of...
Authors
Stephanie G. Prejean, William L. Ellsworth, Mark Zoback, Felix Waldhauser
Magmatic inflation at a dormant stratovolcano: 1996-1998 activity at Mount Peulik volcano, Alaska, revealed by satellite radar interferometry Magmatic inflation at a dormant stratovolcano: 1996-1998 activity at Mount Peulik volcano, Alaska, revealed by satellite radar interferometry
A series of ERS radar interferograms that collectively span the time interval from July 1992 to August 2000 reveal that a presumed magma body located 6.6 ??? 0.5 km beneath the southwest flank of the Mount Peulik volcano inflated 0.051 ??? 0.005 km3 between October 1996 and September 1998. Peulik has been active only twice during historical time, in 1814 and 1852, and the volcano was...
Authors
Zhong Lu, Charles W. Wicks, Daniel Dzurisin, John A. Power, Seth C. Moran, Wayne R. Thatcher
Mapping the sources of the seismic wave field at Kilauea volcano, Hawaii, using data recorded on multiple seismic Antennas Mapping the sources of the seismic wave field at Kilauea volcano, Hawaii, using data recorded on multiple seismic Antennas
Seismic antennas constitute a powerful tool for the analysis of complex wave fields. Well-designed antennas can identify and separate components of a complex wave field based on their distinct propagation properties. The combination of several antennas provides the basis for a more complete understanding of volcanic wave fields, including an estimate of the location of each individual...
Authors
J. Almendros, B. Chouet, P. Dawson, Caleb G. Huber
Very-long-period volcanic earthquakes beneath Mammoth Mountain, California Very-long-period volcanic earthquakes beneath Mammoth Mountain, California
Detection of three very‐long‐period (VLP) volcanic earthquakes beneath Mammoth Mountain emphasizes that magmatic processes continue to be active beneath this young, eastern California volcano. These VLP earthquakes, which occurred in October 1996 and July and August 2000, appear as bell‐shaped pulses with durations of one to two minutes on a nearby borehole dilatometer and on the...
Authors
David P. Hill, P. Dawson, M.J.S. Johnston, A.D. Pitt, G. Biasi, K. Smith
The 12 September 1999 Upper East Rift Zone dike intrusion at Kilauea Volcano, Hawaii The 12 September 1999 Upper East Rift Zone dike intrusion at Kilauea Volcano, Hawaii
Deformation associated with an earthquake swarm on 12 September 1999 in the Upper East Rift Zone of Kilauea Volcano was recorded by continuous GPS receivers and by borehole tiltmeters. Analyses of campaign GPS, leveling data, and interferometric synthetic aperture radar (InSAR) data from the ERS-2 satellite also reveal significant deformation from the swarm. We interpret the swarm as...
Authors
Peter Cervelli, P. Segall, F. Amelung, H. Garbeil, C. Meertens, S. Owen, Asta Mikijus, M. Lisowski
Ancient and modern subduction zone contributions to the mantle sources of lavas from the Lassen region of California inferred from Lu-Hf isotopic systematics Ancient and modern subduction zone contributions to the mantle sources of lavas from the Lassen region of California inferred from Lu-Hf isotopic systematics
Hafnium isotopic compositions have been determined on a suite of calc-alkaline and high-alumina-olivine tholeiitic lavas from the Lassen region of California and are used, in conjunction with previously published mineralogical, geochemical, and isotopic data, to constrain their petrogenesis. Positive correlation between εHf values and geochemical indices of the modern subduction...
Authors
L. E. Borg, Janne Blichert-Toft, Michael A. Clynne
Publications of the Volcano Hazards Program 2001 Publications of the Volcano Hazards Program 2001
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 Geology and Hydrology Disciplines of the USGS and with cooperators at the Alaska Division of Geological and Geophysical Surveys, University of Alaska Fairbanks Geophysical Institute...
Authors
Manuel Nathenson
Magma storage prior to the 1912 eruption at Novarupta, Alaska Magma storage prior to the 1912 eruption at Novarupta, Alaska
New analytical and experimental data constrain the storage and equilibration conditions of the magmas erupted in 1912 from Novarupta in the 20th century's largest volcanic event. Phase relations at H2O+CO2 fluid saturation were determined for an andesite (58.7 wt% SiO2) and a dacite (67.7 wt%) from the compositional extremes of intermediate magmas erupted. The phase assemblages, matrix...
Authors
J.E. Hammer, M.J. Rutherford, W. Hildreth
North-central Oregon Cascades; exploring petrologic and tectonic intimacy in a propagating intra-arc rift North-central Oregon Cascades; exploring petrologic and tectonic intimacy in a propagating intra-arc rift
No abstract available.
Authors
Richard M. Conrey, Edward M. Taylor, Julie M. Donnelly-Nolan, David R. Sherrod
Sulfur dioxide emission rates from Kīlauea Volcano, Hawai‘i, an update: 1998-2001 Sulfur dioxide emission rates from Kīlauea Volcano, Hawai‘i, an update: 1998-2001
Introduction Sulfur dioxide (SO2) emission rates from Kilauea Volcano were first measured by Stoiber and Malone (1975) and have been measured on a regular basis since 1979 (Greenland and others, 1985; Casadevall and others, 1987; Elias and others, 1998; Sutton and others, 2001). A compilation of SO2 emission-rate and wind-vector data from 1979 through 1997 is available as Open-File...
Authors
Tamar Elias, A. Jefferson Sutton