Publications
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Progress made in understanding Mount Rainier's hazards
At 4392 m high, glacier-clad Mount Rainier dominates the skyline of the southern Puget Sound region and is the centerpiece of Mount Rainier National Park. About 2.5 million people of the greater Seattle-Tacoma metropolitan area can see Mount Rainier on clear days, and 150,000 live in areas swept by lahars and floods that emanated from the volcano during the last 6,000 years (Figure 1). These lahar
Authors
T. W. Sisson, J.W. Vallance, P. T. Pringle
Distributed shear of subglacial till due to Coulomb slip
In most models of the flow of glaciers on till beds, it has been assumed that till behaves as a viscoplastic fluid, despite contradictory evidence from laboratory studies. In accord with this assumption, displacement profiles measured in subglacial till have been fitted with viscoplastic models by estimating the stress distribution. Here we present a model that illustrates how observed displacemen
Authors
Neal R. Iverson, Richard M. Iverson
Determining the stress regime in a volcanic edifice from igneous intrusions and deformation measurements
No abstract available.
Authors
Michael P. Poland
Preliminary volcano-hazard assessment for Mount Spurr Volcano, Alaska
Mount Spurr volcano is an ice- and snow-covered stratovolcano complex located in the north-central Cook Inlet region about 100 kilometers west of Anchorage, Alaska. Mount Spurr volcano consists of a breached stratovolcano, a lava dome at the summit of Mount Spurr, and Crater Peak vent, a small stratocone on the south flank of Mount Spurr volcano. Historical eruptions of Crater Peak occurred in 195
Authors
Christopher F. Waythomas, Christopher J. Nye
Areal distribution, thickness, mass, volume, and grain size of tephra-fall deposits from the 1992 eruptions of Crater Peak vent, Mt. Spurr Volcano, Alaska
The Crater Peak flank vent of Mount Spurr volcano erupted June 27, August 18, and September 16-17, 1992. The three eruptions were similar in intensity (vulcanian to subplinian eruption columns reaching up to 14 km Above Sea Level) and duration (3.5 to 4.0 hours) and produced tephra-fall deposits (12, 14, 15 x 106 m3 Dense Rock Equivalent [DRE]) discernible up to 1,000 km downwind. The June 27 ash
Authors
Robert G. McGimsey, Christina A. Neal, Colleen M. Riley
Lahar hazards at Mombacho Volcano, Nicaragua
Mombacho volcano, at 1,350 meters, is situated on the shores of Lake Nicaragua and about 12 kilometers south of Granada, a city of about 90,000 inhabitants. Many more people live a few kilometers southeast of Granada in 'las Isletas de Granada and the nearby 'Peninsula de Aseses. These areas are formed of deposits of a large debris avalanche (a fast moving avalanche of rock and debris) from Mombac
Authors
J.W. Vallance, S. P. Schilling, G. Devoli
Lahar hazards at Agua volcano, Guatemala
At 3760 m, Agua volcano towers more than 3500 m above the Pacific coastal plain to the south and 2000 m above the Guatemalan highlands to the north. The volcano is within 5 to 10 kilometers (km) of Antigua, Guatemala and several other large towns situated on its northern apron. These towns have a combined population of nearly 100,000. It is within about 20 km of Escuintla (population, ca. 100,000)
Authors
S. P. Schilling, J.W. Vallance, O. Matías, M.M. Howell
Volcano hazards at Fuego and Acatenango, Guatemala
The Fuego-Acatenango massif comprises a string of five or more volcanic vents along a north-south trend that is perpendicular to that of the Central American arc in Guatemala. From north to south known centers of volcanism are Ancient Acatenango, Yepocapa, Pico Mayor de Acatenango, Meseta, and Fuego. Volcanism along the trend stretches back more than 200,000 years. Although many of the centers hav
Authors
J.W. Vallance, S. P. Schilling, O. Matías, William I. Rose, M.M. Howell
Lahar-hazard zonation for San Miguel volcano, El Salvador
San Miguel volcano, also known as Chaparrastique, is one of many volcanoes along the volcanic arc in El Salvador. The volcano, located in the eastern part of the country, rises to an altitude of about 2130 meters and towers above the communities of San Miguel, El Transito, San Rafael Oriente, and San Jorge. In addition to the larger communities that surround the volcano, several smaller communitie
Authors
J. J. Major, S. P. Schilling, C.R. Pullinger, C.D. Escobar, C.A. Chesner, M.M. Howell
Volcano-hazard zonation for San Vicente volcano, El Salvador
San Vicente volcano, also known as Chichontepec, is one of many volcanoes along the volcanic arc in El Salvador. This composite volcano, located about 50 kilometers east of the capital city San Salvador, has a volume of about 130 cubic kilometers, rises to an altitude of about 2180 meters, and towers above major communities such as San Vicente, Tepetitan, Guadalupe, Zacatecoluca, and Tecoluca. In
Authors
J. J. Major, S. P. Schilling, C.R. Pullinger, C.D. Escobar, M.M. Howell
Volcano hazards in the San Salvador region, El Salvador
San Salvador volcano is one of many volcanoes along the volcanic arc in El Salvador
(figure 1). This volcano, having a volume of about
110 cubic kilometers, towers above San Salvador,
the country’s capital and largest city. The city has a
population of approximately 2 million, and a
population density of about 2100 people per square
kilometer. The city of San Salvador and other
communities
Authors
J. J. Major, S. P. Schilling, D.J. Sofield, C.D. Escobar, C.R. Pullinger
Hawaiian Volcano Observatory summary 100; Part 1, seismic data, January to December 2000
The Hawaiian Volcano Observatory (HVO) summary presents seismic data gathered during the year and a chronological narrative describing the volcanic events. The seismic summary is offered without interpretation as a source of preliminary data. It is complete in the sense that all data for events of M≥1.5 routinely gathered by the Observatory are included. The emphasis in collection of tilt and defo
Authors
Jennifer S. Nakata