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Volcanoes

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Volcanic eruptions can occur under water or on land; they can be beautiful events, which build islands, or catastrophic events, which endanger lives and property. CMG research aims to understand the geologic processes acting, and the local and regional susceptibility to these potentially hazardous events.

Other related USGS websites:
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Items below are listed from most recently updated to least recently updated.

These are results 1 through 13 of 13 matches.

Publication
Open-File Report 2008-1192: Geologic Resource Evaluation of Pu�uhonua O Hōnaunau National Historical Park, Hawai�i; Part I, Geology and Coastal Landforms

Description: Geologic resource inventories of lands managed by the National Park Service (NPS) are important products for the parks and are designed to provide scientific information to better manage park resources. Park-specific geologic reports are used to identify geologic features and processes that are relevant to park ecosystems, evaluate the impact of human activities on geologic features and processes, identify geologic research and monitoring needs, and enhance opportunities for education and interpretation. These geologic reports are planned to provide a brief geologic history of the park and address specific geologic issues forming a link between the park geology and the resource manager...
updated: 2009-02-17 pages include:

Publication
Scientific Investigations Report 2007-5101: The Coral Reef of South Moloka�i, Hawai�i�Portrait of a Sediment-Threatened Fringing Reef

Description: In this landmark volume, U.S. Geological Survey researchers and their colleagues have developed and applied a remarkably integrated approach to the reefs of Moloka�i, combining geology, oceanography, and biology to provide an in-depth understanding of the processes that have made these reefs grow and that now limit them. They have joined old fashioned natural history of marine animals and plants with study of the geological evolution of the island, hydrology, meteorology, and land-use history, to an arsenal of new methods of remote sensing, including aerial photography, laser ranging, infrared thermal mapping, seismic reflection, in-situ instrumentation to measure chemical parameters of water quality, and direct measurements of the physical driving forces affecting them�such as wave energy, currents, sedimentation, and sediment transport. They provide a level of documentation and insight that has never been available for any reef before.
updated: 2008-11-19 pages include:

Publication
Professional Paper 1661-E: Seismic Stability of the Duwamish River Delta, Seattle, Washington

Description: The delta front of the Duwamish River valley near Elliott Bay and Harbor Island is founded on young Holocene deposits shaped by sea-level rise, episodic volcanism, and seismicity. These river-mouth deposits are highly susceptible to seismic soil liquefaction and are potentially prone to submarine landsliding and disintegrative flow failure. A highly developed commercial-industrial corridor, extending from the City of Kent to the Elliott Bay/Harbor Island marine terminal facilities, is founded on the young Holocene deposits of the Duwamish River valley. The deposits of this Holocene delta have been shaped not only by relative sea-level rise but also by episodic volcanism and seismicity. Ground-penetrating radar (GPR), cores, in situ testing, and outcrops are being used to examine the delta stratigraphy and to infer how these deposits will respond to future volcanic eruptions and earthquakes in the region. A geotechnical investigation of these river-mouth deposits indicates high initial liquefaction susceptibility during earthquakes, and possibly the potential for unlimited-strain disintegrative flow failure of the delta front.
updated: 2007-11-02 pages include:

Publication
Antarctica - The Dynamic Heart of It All - USGS Fact Sheet

Description: The U.S. Geological Survey (USGS) has worked in Antarctica for nearly 50 years, starting in 1947 with geophysical and geologic surveys and in 1957 with topographic mapping. Today the USGS also does marine, airborne, and satellite studies, as well as mapping and coring of the ice sheet, as part of the U.S. Antarctic Program. USGS scientific leadership is a cornerstone for international Antarctic cooperation, and data and information gathered by USGS researchers are important to the development of U.S. policy regarding the Antarctic.
updated: 2004-03-02 pages include:

Publication
Crater Lake National Park: Presently Tranquil - USGS Fact Sheet

Description: Are volcanic eruptions likely again at Crater Lake? One of the approaches U.S. Geological Survey scientists are using to answer this important question is to unravel the geologic history of the Crater Lake caldera floor.
updated: 2004-03-02 pages include:

Publication
The Escanaba Trough of Gorda Ridge: A Laboratory for Mineral-forming Processes - USGS Fact Sheet

Description: The Gorda Ridge is a unique geological system in the Exclusive Economic Zone of the United States. This tectonically and volcanically active plate boundary has an unusual morphology for spreading centers in the Pacific Ocean: a deep, wide axial valley flanked by high ridges. Because of its location near the continental margin, part of the axial valley known as the Escanaba Trough is covered by sediment. The Escanaba Trough provides opportunities for scientists to learn details about tectonics, volcanism, mineral formation, and biological activity that are not normally observed at mid-ocean ridges. It is a geological laboratory of grand proportions.
updated: 2004-03-02 pages include:

Publication
Natural Disasters - Forecasting Hurricane Occurrence

Description: Events such as hurricanes, earthquakes, floods, tsunamis, volcanic eruptions, and tornadoes are natural disasters because they negatively impact society, and so they must be measured and understood in human-related terms. At the U.S. Geological Survey, we have developed a new method to examine fatality and dollar-loss data, and to make probabilistic estimates of the frequency and magnitude of future events. This information is vital to large sectors of society including disaster relief agencies and insurance companies.
updated: 2003-03-02 pages include:

Publication
Lava-Cooling Operations During the 1973 Eruption of Eldfell Volcano, Heimaey, Vestmannaeyjar, Iceland, U.S.Geological Survey Open-File Report 97-724, by Richard S. Williams,Jr., Editor

Description: In order to protect public and private property from being destroyed by lava flows, various plans and actual attempts have been made in the past on volcanoes to stop or divert lava flows. The most extensive ever attempted, however, were the lava-cooling operations on Heimaey, Iceland, and the two excellent accounts of the operations that were published in Icelandic by a geophysicist, Thorbj�rn Sigurgeirsson, and two engineers, Valdimar Kr. J�nsson and Matth�as Matth�asson, are translated into English in this open-file report.
updated: 2002-04-24 pages include:

Publication
Icelandic-English Glossary of Selected Geoscience Terms. R Williams; USGS Open-file Report 95-807

Description: A Glossary of Icelandic geoscience terms, and discussion of their etymology within the Icelandic language.
updated: 2002-04-24 pages include:

Map
Hawaiian Islands GLORIA Imagery

Description: GLORIA sidescan sonar imagery of the Hawaiian Islands, showing index map and downloadable quadrangles of sea-floor imagery.
updated: 2002-04-03 pages include:

Publication
High-Resolution Multibeam Survey off Honolulu, Hawaii

Description: AGU Abstract on sonar mapping survey of seafloor off Honolulu Hawaii
updated: 1999-08-09 pages include:

Publication
Hydrocarbons in Monterey Bay Marine Sanctuary

Description: Description and interpretation of hydrocarbons associated with fluid venting processes in Monterey Bay, California.
updated: 1999-02-17 pages include:

Publication
Pacific Science (1997), vol. 51, no. 1:54-75 - Sea-Floor Geology of a Part of Mamala Bay, Hawaii

Description: Journal article discussing mapping survey off Honolulu Hawaii including sidescan sonar images, 3.5-kHz profiles, video and still visual images, and box-core samples
updated: 1997-10-08 pages include:

These are results 1 through 13 of 13 matches.

Coastal and Marine Geology Program > Online Science Resource Locator > Volcanoes