Recording active-seismic ground rotations using induction-coil magnetometers

TitleRecording active-seismic ground rotations using induction-coil magnetometers
Publication TypeJournal Article
Year of Publication2018
AuthorsBarak O., Key K, Constable S, Ronen S.
JournalGeophysics
Volume83
PaginationP19-P42
Date Published2018/09
Type of ArticleArticle
ISBN Number0016-8033
Accession NumberWOS:000453050000007
Keywordsearthquake; Geochemistry & Geophysics; motions
Abstract

Most of the current rotational sensing technology is not geared toward the recording of seismic rotations' amplitudes and frequencies. There are few instruments that are designed for rotational seismology, and the technology for building them is currently being developed. There are no mass industrial producers of seismic rotation sensors as there are for geophones, and only one current sensor model can be deployed on the ocean bottom. We reviewed some current rotational-seismic acquisition technologies, and developed a new method of recording rotations using an existing, robust and field-deployable technology that had seen extensive use in large exploration surveys: induction-coil magnetometers. We conducted an active seismic experiment, in which we found that magnetometers could be used to record seismic rotations. We converted the magnetometer data to rotation-rate data, and validated them by comparing the waveforms and amplitudes with rotation rates recorded by electrokinetic rotation sensors.

DOI10.1190/geo2017-0281.1
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