Reducing motion noise in marine magnetotelluric measurements by means of tilt records.

Neska, A., Nowozynski, K., Reda, J. and Jegen-Kulcsar, Marion D. (2013) Reducing motion noise in marine magnetotelluric measurements by means of tilt records. Open Access Geophysical Journal International, 194 (1). pp. 304-315. DOI 10.1093/gji/ggt087.

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Abstract

The analysis of marine magnetotelluric data is often complicated by disturbing signals that are caused by small-scale periodic movements of the instrument. The motion-induced noise leads to a bias and/or severe scattering in the derived magnetotelluric transfer functions. Both the motion itself and its effects on the magnetic and telluric time-series are investigated in this study using an 80 d magnetotelluric data set that includes dynamic tilt records measured in the Pacific Ocean off Costa Rica. We apply a standard motion removal technique as well as a newly developed method to correct for motion-induced noise. The resulting magnetotelluric transfer functions are of significantly better quality than the uncorrected ones. Furthermore, the study of the properties of motion noise leads to conclusions about the optimal processing approach even in case of data sets where an explicit correction for that noise is not possible.

Document Type: Article
Additional Information: This article has been published in Geophysical Journal International ©2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: Time-series analysis; Magnetotellurics; Pacific Ocean
Research affiliation: OceanRep > SFB 574
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1093/gji/ggt087
ISSN: 0956-540X
Projects: SFB574, Future Ocean
Date Deposited: 25 Jul 2013 07:37
Last Modified: 22 Jan 2019 09:58
URI: http://oceanrep.geomar.de/id/eprint/21854

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