Normal mode coupling observations with a rotation sensor

Nader, M. F. and Igel, H. and Ferreira, A. M. G. and Al-Attar, David and Wassermann, J. and Schreiber, K. U. (2015) Normal mode coupling observations with a rotation sensor. Geophysical Journal International, 201 (3). pp. 1482-1490. ISSN ISSN: 0956-540X, ESSN: 1365-246X DOI 10.1093/gji/ggv082

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Official URL: http://gji.oxfordjournals.org/content/201/3/1482

Abstract

We present observations of cross coupled spheroidal modes in the Earth's free oscillation spectrum recorded by the vertical component G-ring laser (Geodetical Station Wettzell) of the 2011 Mw 9.0 Tohoku-Oki earthquake. In an attempt to determine which are the mechanisms responsible for spheroidal energy in a vertical axes rotational spectra, we first rule out instrumental effects as well as the effect of local heterogeneity. Secondly, we carry out simulations of an ideal rotational sensor taking into account the effects of the Earth's rotation, its hydrostatic ellipticity and structural heterogeneity, which results in a good fit to the data. Simulations considering each effect separately are performed in order to evaluate the sensitivity of rotational motions to various phenomena compared to traditional translation measurements.

Item Type: Article
Additional Information: This article has been accepted for publication in Geophysical Journal International © The Authors 2015. Published by Oxford University Press on behalf of The Royal Astronomical Society.All rights reserved.
Uncontrolled Keywords: 2015AREP; IA69;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
08 - Green Open Access
Journal or Publication Title: Geophysical Journal International
Volume: 201
Page Range: pp. 1482-1490
Identification Number: 10.1093/gji/ggv082
Depositing User: Sarah Humbert
Date Deposited: 14 Aug 2015 16:27
Last Modified: 30 Aug 2015 02:23
URI: http://eprints.esc.cam.ac.uk/id/eprint/3420

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