The slides and the accompanying script presented here are based on a campground presentation at Chiricahua National Monument in 1994. Examples of eruptions at active volcanoes are used to help the audience visualize events that took place in the National Monument 27 million years ago. This presentation stresses the following themes: 1) The National Monument lies on the flank of an...

Authors

J.S. Pallister, E. A. Du Bray

Natural Hazards Mission Area, Volcano Hazards Program, Volcano Science Center

January 1, 1994

A compilation of sulfur dioxide and carbon dioxide emission-rate data from Mount St. Helens during 1980-88 A compilation of sulfur dioxide and carbon dioxide emission-rate data from Mount St. Helens during 1980-88

Airborne monitoring of Mount St. Helens by the USGS began inMay 1980 for sulfur dioxide emissions and in July 1980 forcarbon dioxide emissions. A correlation spectrometer, orCOSPEC, was used to measure sulfur dioxide in Mount St.Helens' plume. The upward-looking COSPEC was mounted in afixed-wing aircraft and flown below and at right angles to theplume. Typically, three to six traverses...

Authors

Kenneth A. McGee, Thomas J. Casadevall

Natural Hazards Mission Area, Volcano Hazards Program, Volcano Science Center

January 1, 1994

Abstracts of the eighth international conference on Geochronology, cosmochronology, and isotope geology Abstracts of the eighth international conference on Geochronology, cosmochronology, and isotope geology

No abstract available.

Authors

Marvin A. Lanphere, G. Brent Dalrymple, Brent D. Turrin

Natural Hazards Mission Area, Volcano Hazards Program, Volcano Science Center

January 1, 1994

Geochemical changes in crude oil spilled from the Exxon Valdez supertanker into Prince William Sound, Alaska Geochemical changes in crude oil spilled from the Exxon Valdez supertanker into Prince William Sound, Alaska

North Slope crude oil spilled from the T/V Exxon Valdez in March 1989 and contaminated about 500 km of Prince William Sound shoreline. Aliphatic and aromatic hydrocarbons in oil samples collected in August 1990 and June 1992 from beaches on six islands impacted by the spill have been compared with the hydrocarbons from North Slope crude oil taken from the stricken tanker. Degradation...

Authors

Frances D. Hostettler, Keith A. Kvenvolden

Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program

January 1, 1994

Fluid expulsion sites on the Cascadia accretionary prism: mapping diagenetic deposits with processed GLORIA imagery Fluid expulsion sites on the Cascadia accretionary prism: mapping diagenetic deposits with processed GLORIA imagery

Point-discharge fluid expulsion on accretionary prisms is commonly indicated by diagenetic deposition of calcium carbonate cements and gas hydrates in near-surface (

Authors

Bobb Carson, Erol Seke, Valerie F. Paskevich, Mark L. Holmes

Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Woods Hole Coastal and Marine Science Center

January 1, 1994

The Loma Prieta, California, Earthquake of October 17, 1989 — Hydrologic disturbances The Loma Prieta, California, Earthquake of October 17, 1989 — Hydrologic disturbances

Seismic events have long been known to cause changes in the level of oceans, streams, lakes, and the water table. The great San Francisco earthquake of 1906 induced significant hydrologic changes that were qualitatively similar to those changes observed for the Loma Prieta earthquake. What is different is that the hydrologic data sets collected from the Loma Prieta event have enough...

Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

January 1, 1994