Operation of a telemetered seismic network on the Alaska Peninsula. Annual report
A large aperture network of eleven short period seismic stations is being operated on the Alaska Peninsula and several offshore islands to acquire data for the study of the seismotectonics of a part of the Alaska-Aleutian arc-trench structure. The system operated satisfactorily during the past year...
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ftosti:oai:osti.gov:6526012 2023-07-30T04:04:41+02:00 Operation of a telemetered seismic network on the Alaska Peninsula. Annual report Not Available 2013-04-18 application/pdf http://www.osti.gov/servlets/purl/6526012 https://www.osti.gov/biblio/6526012 https://doi.org/10.2172/6526012 unknown http://www.osti.gov/servlets/purl/6526012 https://www.osti.gov/biblio/6526012 https://doi.org/10.2172/6526012 doi:10.2172/6526012 58 GEOSCIENCES ALASKA SEISMICITY ALEUTIAN ISLANDS CONTINENTAL SHELF EARTHQUAKES RESEARCH PROGRAMS SEISMIC ARRAYS SEISMIC DETECTION VOLCANOES CONTINENTAL MARGIN DETECTION ISLANDS MEASURING INSTRUMENTS NORTH AMERICA PACIFIC NORTHWEST REGION SEISMIC EVENTS USA 2013 ftosti https://doi.org/10.2172/6526012 2023-07-11T10:49:18Z A large aperture network of eleven short period seismic stations is being operated on the Alaska Peninsula and several offshore islands to acquire data for the study of the seismotectonics of a part of the Alaska-Aleutian arc-trench structure. The system operated satisfactorily during the past year and continued to provide seismic coverage at a low magnitude threshold level (M/sub L/ = 2.0). An event detection system, developed under this contract over the past years, has been field installed and is undergoing fine tuning. Focal mechanism studies of intermediate depths Benioff zone earthquakes were continued. Like a previous, smaller set, these mechanisms show predominantly down-dip extension, indicating gravitational sinking of the subducting lithosphere. Analysis of the combined data from our network and a temporary array of Ocean Bottom Seismometers, deployed under a related study, indicate that epicenters of earthquakes in the continental shelf area off Kodiak Island are shifted landward by about 15 km with respect to the epicenters determined from the combined data set. Clusters of shallow seismic activity associated with certain Alaska Peninsula volcanoes, observed over the past years, had previously been interpreted as related to shallow magmatic-geothermal reservoirs. Volcanologic-petrologic field studies conducted last year show that volcanic centers associated with such swarms do indeed have surface manifestations of hydrothermal activity. Other/Unknown Material Kodiak Alaska Aleutian Islands SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Pacific |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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topic |
58 GEOSCIENCES ALASKA SEISMICITY ALEUTIAN ISLANDS CONTINENTAL SHELF EARTHQUAKES RESEARCH PROGRAMS SEISMIC ARRAYS SEISMIC DETECTION VOLCANOES CONTINENTAL MARGIN DETECTION ISLANDS MEASURING INSTRUMENTS NORTH AMERICA PACIFIC NORTHWEST REGION SEISMIC EVENTS USA |
spellingShingle |
58 GEOSCIENCES ALASKA SEISMICITY ALEUTIAN ISLANDS CONTINENTAL SHELF EARTHQUAKES RESEARCH PROGRAMS SEISMIC ARRAYS SEISMIC DETECTION VOLCANOES CONTINENTAL MARGIN DETECTION ISLANDS MEASURING INSTRUMENTS NORTH AMERICA PACIFIC NORTHWEST REGION SEISMIC EVENTS USA Not Available Operation of a telemetered seismic network on the Alaska Peninsula. Annual report |
topic_facet |
58 GEOSCIENCES ALASKA SEISMICITY ALEUTIAN ISLANDS CONTINENTAL SHELF EARTHQUAKES RESEARCH PROGRAMS SEISMIC ARRAYS SEISMIC DETECTION VOLCANOES CONTINENTAL MARGIN DETECTION ISLANDS MEASURING INSTRUMENTS NORTH AMERICA PACIFIC NORTHWEST REGION SEISMIC EVENTS USA |
description |
A large aperture network of eleven short period seismic stations is being operated on the Alaska Peninsula and several offshore islands to acquire data for the study of the seismotectonics of a part of the Alaska-Aleutian arc-trench structure. The system operated satisfactorily during the past year and continued to provide seismic coverage at a low magnitude threshold level (M/sub L/ = 2.0). An event detection system, developed under this contract over the past years, has been field installed and is undergoing fine tuning. Focal mechanism studies of intermediate depths Benioff zone earthquakes were continued. Like a previous, smaller set, these mechanisms show predominantly down-dip extension, indicating gravitational sinking of the subducting lithosphere. Analysis of the combined data from our network and a temporary array of Ocean Bottom Seismometers, deployed under a related study, indicate that epicenters of earthquakes in the continental shelf area off Kodiak Island are shifted landward by about 15 km with respect to the epicenters determined from the combined data set. Clusters of shallow seismic activity associated with certain Alaska Peninsula volcanoes, observed over the past years, had previously been interpreted as related to shallow magmatic-geothermal reservoirs. Volcanologic-petrologic field studies conducted last year show that volcanic centers associated with such swarms do indeed have surface manifestations of hydrothermal activity. |
author |
Not Available |
author_facet |
Not Available |
author_sort |
Not Available |
title |
Operation of a telemetered seismic network on the Alaska Peninsula. Annual report |
title_short |
Operation of a telemetered seismic network on the Alaska Peninsula. Annual report |
title_full |
Operation of a telemetered seismic network on the Alaska Peninsula. Annual report |
title_fullStr |
Operation of a telemetered seismic network on the Alaska Peninsula. Annual report |
title_full_unstemmed |
Operation of a telemetered seismic network on the Alaska Peninsula. Annual report |
title_sort |
operation of a telemetered seismic network on the alaska peninsula. annual report |
publishDate |
2013 |
url |
http://www.osti.gov/servlets/purl/6526012 https://www.osti.gov/biblio/6526012 https://doi.org/10.2172/6526012 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kodiak Alaska Aleutian Islands |
genre_facet |
Kodiak Alaska Aleutian Islands |
op_relation |
http://www.osti.gov/servlets/purl/6526012 https://www.osti.gov/biblio/6526012 https://doi.org/10.2172/6526012 doi:10.2172/6526012 |
op_doi |
https://doi.org/10.2172/6526012 |
_version_ |
1772816249367035904 |