Normal mode coupling observations with a rotation sensor

M. F. Nader; H. Igel; A. M.G. Ferreira; D. Al-Attar; J. Wassermann; K. U. Schreiber

doi:10.1093/gji/ggv082

Normal mode coupling observations with a rotation sensor

M. F. Nader, H. Igel, A. M.G. Ferreira, D. Al-Attar, J. Wassermann, K. U. Schreiber

Research Institute Satellite Geodesy

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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 StationWettzell) of the 2011 M_w 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.

Original language	English
Pages (from-to)	1482-1490
Number of pages	9
Journal	Geophysical Journal International
Volume	201
Issue number	3
DOIs	https://doi.org/10.1093/gji/ggv082
State	Published - 11 Mar 2015

Keywords

Rotational seismology
Surface waves and free oscillations

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10.1093/gji/ggv082

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title = "Normal mode coupling observations with a rotation sensor",

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 StationWettzell) 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.",

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AU - Nader, M. F.

AU - Igel, H.

AU - Ferreira, A. M.G.

AU - Al-Attar, D.

AU - Wassermann, J.

AU - Schreiber, K. U.

PY - 2015/3/11

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N2 - We present observations of cross coupled spheroidal modes in the Earth's free oscillation spectrum recorded by the vertical component G-ring laser (Geodetical StationWettzell) 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.

AB - We present observations of cross coupled spheroidal modes in the Earth's free oscillation spectrum recorded by the vertical component G-ring laser (Geodetical StationWettzell) 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.

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KW - Surface waves and free oscillations

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Normal mode coupling observations with a rotation sensor

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