Publications
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Aftershock decay, productivity, and stress rates in Hawaii: Indicators of temperature and stress from magma sources
We examined dozens of aftershock sequences in Hawaii in terms of Gutenberg-Richter and modified Omori law parameters. We studied p, the rate of aftershock decay; Ap, the aftershock productivity, defined as the observed divided by the expected number of aftershocks; and c, the time delay when aftershock rates begin to fall. We found that for earthquakes shallower than 20 km, p values >1.2 are near
Authors
Fred W. Klein, Tom Wright, Jennifer Nakata
Borehole dilatometer installation, operation, and maintenance at sites in Hawaii
In response to concerns about the potential hazard of Mauna Loa volcano in Hawaii, the USGS began efforts in 1998 to add four high-resolution borehole sites. Located at these sites are; strainmeters, tiltmeters, seismometers, accelerometers and other instrumentation. These instruments are capable of providing continuous monitoring of the magma movement under Mauna Loa. Each site was planned to pro
Authors
G.D. Myren, M.J.S. Johnston, R.J. Mueller
Local infrasound observations of large ash explosions at Augustine Volcano, Alaska, during January 11–28, 2006
We present and interpret acoustic waveforms associated with a sequence of large explosion events that occurred during the initial stages of the 2006 eruption of Augustine Volcano, Alaska. During January 11–28, 2006, 13 large explosion events created ash-rich plumes that reached up to 14 km a.s.l., and generated atmospheric pressure waves that were recorded on scale by a microphone located at a dis
Authors
Tanja Petersen, Silvio De Angelis, Guy Tytgat, Stephen R. McNutt
Usoi Dam wave overtopping and flood routing in the Bartang and Panj Rivers, Tajikistan
The Usoi dam was created in the winter of 1911 after an enormous seismogenic rock slide completely blocked the valley of the Bartang River in the Pamir Mountains of southeastern Tajikistan. At present the dam impounds 17 million cubic meters of water in Lake Sarez.
Flood volume and discharge estimates were made for several landslide generated floods that could overtop the dam. For landslide vol
Authors
John Risley, Joseph Walder, Roger Denlinger
Publications of the Volcano Hazards Program 2004
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, University of Ha
Authors
Manuel Nathenson
AMS Radiocarbon dating of paleosols intercalated with tephra layers from Mayon Volcano, southern Luzon, Philippines: A preliminary report
This paper presents the AMS 14C dates of paleosols intercalated with tephra layers in the vicinity of Mayon Volcano, southern Luzon, Philippines. the obtained 14C dates are almost consistent with the stratigraphy of the Mayon tephra group. On the basis of calibrated 14C age of soil layer directly overlying the lowest ash layer, the oldest eruptive event must have taken place shortly before 20 cal
Authors
Ma. Hannah T. Mirabueno, Mitsuru Okuno, Toshio Nakamura, Christopher G. Newhall, Tetsuo Kobayashi
InSAR captures rifting and volcanism in East Africa
In the past decade, synthetic aperture radar interferometric (InSAR) has enjoyed increasing use as a tool for detecting and characterizing surface deformation associated with volcanoes, earthquakes, glaciers, and other geological processes. Though InSAR can only image deformation that occurs along the radar line-of-sight and is subject to atmospheric, orbital, and other errors that can be difficul
Authors
Michael P. Poland
Downstream aggradation owing to lava dome extrusion and rainfall runoff at Volcán Santiaguito, Guatemala
Persistent lava extrusion at the Santiaguito dome complex (Guatemala) results in continuous lahar activity and river bed aggradation downstream of the volcano. We present a simple method that uses vegetation indices extracted from Landsat Thematic Mapper (TM) data to map impacted zones. Application of this technique to a time series of 21 TM images acquired between 1987 and 2000 allow us to map, m
Authors
Andrew J. L. Harris, James W. Vallance, Paul Kimberly, William I. Rose, Otoniel Matías, Elly Bunzendahl, Luke P. Flynn, Harold Garbeil
USGS, NPS, educate the public on the risks, wonders of Alaska's volcanoes
No abstract available.
Authors
Jennifer N. Adleman
Groundwater in geologic processes, 2nd edition
Interest in the role of Groundwater in Geologic Processes has increased steadily over the past few decades. Hydrogeologists and geologists are now actively exploring the role of groundwater and other subsurface fluids in such fundamental geologic processes as crustal heat transfer, ore deposition, hydrocarbon migration, earthquakes, tectonic deformation, diagenesis, and metamorphism.Groundwater in
Authors
Steven E. Ingebritsen, Ward E. Sanford, Christopher E. Neuzil
Infrasonic array observations at I53US of the 2006 Augustine Volcano eruptions
The recent January 2006 Augustine eruptions, from the 11th to the 28th, have produced a series of 12 infrasonic signals that were observed at the I53US array at UAF. the eruption times for the signals were provided by the Alaska Volcanic Observatory at UAF using seismic sensors and a Chaparral microphone that are installed on Augustine Island. The bearing and distance of Augustine from I53US are,
Authors
C.R. Wilson, J.V. Olson, Curt A.L. Szuberla, Steve McNutt, Guy Tytgat, Douglas P. Drob
Applications of geophysical methods to volcano monitoring
The array of geophysical technologies used in volcano hazards studies - some developed originally only for volcano monitoring - ranges from satellite remote sensing including InSAR to leveling and EDM surveys, campaign and telemetered GPS networks, electronic tiltmeters and strainmeters, airborne magnetic and electromagnetic surveys, short-period and broadband seismic monitoring, even microphones
Authors
Jeff Wynn, Daniel Dzurisin, Carol A. Finn, James P. Kauahikaua, Richard G. Lahusen