Publications
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Low intensity of the geomagnetic field in early Jurassic time Low intensity of the geomagnetic field in early Jurassic time
From a large collection of Jurassic continental tholeiites cropping out in Europe and Africa, we selected 90 samples for paleointensity determinations. The samples were carefully selected to avoid any secondary magnetizations, especially viscous magnetization. Use of the Thellier method reveals that magnetic property changes due to heating begin often at quite low temperatures but...
Authors
M. Perrin, M. Prevot, E. A. Mankinen
Documented historical landslide dams from around the world Documented historical landslide dams from around the world
This data compilation consists of dBase IV1 data files of the location, date, triggering mechanism, kind, size, failure time and mechanism, breach dimensions, subsequent controls, materials, and references for 463 historical landslide dams and associated natural reservoirs that have been recorded throughout the World. The data base presented in this report is a compilation of information...
Authors
John E. Costa, Robert L. Schuster
Volcanologic investigations in the Commonwealth of the Northern Mariana Islands, September-October 1990 Volcanologic investigations in the Commonwealth of the Northern Mariana Islands, September-October 1990
U.S. Geological Survey volcanologists examined the ten volcanoes in the active Mariana Arc north of Saipan in May 1992, at the request of the Governor and the Disaster Control Office of the Commonwealth of the Northern Mariana Islands (CNMI). A shallow earthquake swarm on Anatahan in March-April 1990 and reports of possible new fuming on Agrigan in August 1990 had prompted the evacuation...
Authors
Richard B. Moore, R. Y. Koyanagi, M. K. Sako, F. A. Trusdell, George Kojima, R. L. Ellorda, S. K. Zane
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, January 1991 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, January 1991
No abstract available.
Authors
John B. Townshend, Richard V. O’Connell, Carol Ann Varner
Crustal structure of accreted terranes in southern Alaska, Chugach Mountains and Copper River Basin, from seismic refraction results Crustal structure of accreted terranes in southern Alaska, Chugach Mountains and Copper River Basin, from seismic refraction results
Seismic refraction data were collected along a 320-km-long "transect' line in southern Alaska, crossing the Prince William, Chugach, Peninsular, and Wrangellia terranes, and along several shorter lines within individual terranes. Velocity structure in the upper crust (less than 9-km depth) differs among the four terranes. In contrast, layers in the middle crust (9- to 25-km depth) in...
Authors
G. S. Fuis, E. L. Ambos, Walter D. Mooney, N.I. Christensen, E. Geist
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, August 1991 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, August 1991
No abstract available.
Authors
John B. Townshend, Richard V. O’Connell, Carol Ann Varner
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, May 1991 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, May 1991
No abstract available.
Authors
John B. Townshend, Richard V. O’Connell, Carol Ann Varner
Hydrologic monitoring for effects of geothermal and ground-water development, Long Valley caldera, California Hydrologic monitoring for effects of geothermal and ground-water development, Long Valley caldera, California
No abstract available.
Authors
C. D. Farrar, D. L. Lyster
Large landslides from oceanic volcanoes Large landslides from oceanic volcanoes
Large landslides are ubiquitous around the submarine flanks of Hawaiian volcanoes, and GLORIA has also revealed large landslides offshore from Tristan da Cunha and El Hierro. On both of the latter islands, steep flanks formerly attributed to tilting or marine erosion have been reinterpreted as landslide headwalls mantled by younger lava flows. These landslides occur in a wide range of...
Authors
R. T. Holcomb, R. C. Searle
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, September 1991 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska, September 1991
No abstract available.
Authors
John B. Townshend, Richard V. O’Connell, Carol Ann Varner