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Recording the aurora at seismometers across Alaska

Carl Tape, Adam T. Ringler and Don L. Hampton
Recording the aurora at seismometers across Alaska
Seismological Research Letters (July 2020) 91 (6): 3039-3053

Abstract

We examine three continuously recording data sets related to the aurora: all-sky camera images, three-component magnetometer data, and vertical-component, broadband seismic data as part of the EarthScope project (2014 to present). Across Alaska there are six all-sky cameras, 13 magnetometers, and >200 seismometers. The all-sky images and magnetometers have the same objective, which is to monitor space weather and improve our understanding of auroral activity, including the influence on magnetic fields in the ground. These variations in the magnetic field are also visible on seismometers, to the extent that during an auroral event, the long-period (40-800 s) waves recorded by a seismometer are magnetic field variations, not true ground motion. Although this is a problem-one that can be rectified with magnetic shielding at each seismometer site-it is also an opportunity because the present seismic array in Alaska is much broader than the coverage by magnetometers and all-sky cameras. Here we focus on three aurora events and document a direct link between aurora images in the night sky and seismometer recordings on ground. Simultaneous recordings by magnetometers provide a critical link between the sky images and the seismometer recordings. We document qualitative correlations among sky, magnetic, and seismic data. The findings suggest that the signature of auroral activity is widespread across seismometers in Alaska, implying that the seismic array could be used to enhance the spatial resolution of the existing network of all-sky cameras and magnetometers. Future efforts to improve the multisensor seismic stations in Alaska, for the purpose of monitoring seismic and auroral activity, should consider installation of all-sky cameras, installation of magnetometers, and magnetic shielding of seismic sensors.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 91
Serial Issue: 6
Title: Recording the aurora at seismometers across Alaska
Affiliation: University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States
Pages: 3039-3053
Published: 20200729
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 68
Accession Number: 2020-077207
Categories: Applied geophysicsSeismology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. sketch map
N51°00'00" - N72°00'00", W130°00'00" - E173°00'00"
Secondary Affiliation: U. S. Geological Survey, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202047
Program Name: USGSOPNon-USGS publications with USGS authors
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