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Normal mode coupling observations with a rotation sensor

Nader, MF; Igel, H; Ferreira, AMG; Al-Attar, D; Wassermann, J; Schreiber, KU; (2015) Normal mode coupling observations with a rotation sensor. Geophysical Journal International , 201 (3) pp. 1482-1490. 10.1093/gji/ggv082. Green open access

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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.

Type: Article
Title: Normal mode coupling observations with a rotation sensor
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/gji/ggv082
Publisher version: http://dx.doi.org/10.1093/gji/ggv082
Language: English
Additional information: This article has been accepted for publication in Geophysical Journal International, copyright © The Authors 2015. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: Surface waves and free oscillations, Rotational seismology
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1496141
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