Operation of a telemetered seismic network on the Alaska Peninsula. Annual report
A large-aperture network of 11 short-period seismometers is being operated on the Alaska Peninsula and several offshore islands for the primary purpose of permitting data acquisition to study the seismotectonics of the area which is part of the Alaska-Aleutian arc-trench structure. Data from the network are routinely provided to Lamont-Doherty Geological Observatory in connection with a related program entitled ''Comprehensive Study of the Seismotectonics of the Aleutian Arc''. Technical improvements made during the report period have resulted in an over 90 percent reliability of the network between July 1977 and the present. Three strong motion instruments have been installed in that portion of the area which is part of a seismic gap. Seismic data accumulated from the network have permitted us to delineate the Benioff zone, the most prominent seismotectonic feature of the study area. Seismic activity in the suspected seismic gap area indeed appears lower than in other portions of the structure. Shallow seismicity, by and large diffuse throughout the area, clusters with great temporal and spatial variability along the line of volcanoes. Some of the clusters are probably associated with shallow magma chambers the existence of which is inferred from other work. Shallow seismic activity has been associated with the formation of two maars (initial perforation of the earth's crust by a rising magma front) in the study area.
- Research Organization:
- Alaska Univ., Fairbanks (USA). Geophysical Inst.
- DOE Contract Number:
- EY-76-S-06-2229-006
- OSTI ID:
- 6799750
- Report Number(s):
- RLO-2229-T6-5
- Country of Publication:
- United States
- Language:
- English
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Operation of a telemetered seismic network on the Alaska Peninsula
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Related Subjects
ALASKA
SEISMICITY
TECTONICS
ALEUTIAN ISLANDS
DATA ACQUISITION
TELEMETRY
DATA ACQUISITION SYSTEMS
SEISMOGRAPHS
RELIABILITY
COMMUNICATIONS
DATA TRANSMISSION
ISLANDS
MEASURING INSTRUMENTS
NORTH AMERICA
PACIFIC NORTHWEST REGION
SEISMIC ARRAYS
SEISMIC DETECTORS
USA
580201* - Geophysics- Seismology & Tectonics- (1980-1989)