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Detailed Reference Information
Ward et al. 1991
Ward, P.L., Pitt, A.M. and Endo, E. (1991). Seismic evidence for magma in the vicinity of Mt. Katmai, Alaska. Geophysical Research Letters 18: doi: 10.1029/91GL01906. issn: 0094-8276.

P-wave traveltime delays of as much as 0.9 sec are consistently observed at one seismic station from local and regional earthquakes 70 to 150 km deep. This station is on the southwest flank of Mt. Trident, the most recently active volcano within Katmai National Park, Alaska. Delays from local shallow earthquakes are typically less than 0.3 sec, suggesting that most of the major delay results from anomalous material at depths of more than a few kilometers. This station is located near the center of a bowl-shaped low in the Bouguer gravity field that is approximately 15 km in diameter and more than 25 mgals deep. These anomalies suggest, but do not prove, the presence of considerable amounts of magma in the shallow part of the crust that could have been the source for all magma erupted in the vicinity of Mt. Katmai and Mt. Trident this century.

BACKGROUND DATA FILES

Abstract

Keywords
Seismology, Seismicity, Geodesy and Gravity, Regional and global gravity anomalies and earth structure, Information Related to Geographic Region, North America, Volcanology, Physics and chemistry of magma bodies
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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