Deep Earth rotational seismology

Author:

Abreu Rafael12ORCID,Durand Stephanie3,Rost Sebastian4ORCID,Thomas Christine2

Affiliation:

1. Institut de Physique du Globe de Paris, CNRS, Université de Paris , 75005 Paris, France

2. Institut für Geophysik, Westfälische Wilhelms-Universität Münster , 48149 Münster, Germany

3. Université Claude Bernard Lyon, UCBL, ENSL, UJM, CNRS, LGL-TPE , F-69622 Villeurbanne, France

4. School of Earth and Environment, University of Leeds , Leeds LS2 9JT, UK

Abstract

SUMMARYRotational seismology opens a new avenue to study the deep interior of the Earth. Using data from the Wettzell Observatorium, Germany, where a ring laser gyroscope and a 3-component translational broadband seismometer are co-located, we report the presence of clear S, ScS and SdS signals on both rotational and translational seismograms. Using S wave arrivals, we propose a new methodology to extract information on velocity changes in the Earth mantle and we show that, by combining both translational and rotational data, we are able to solve the well known velocity-depth ambiguity inherent to classical inverse problems. The methodology is validated using ray theory and 2.5-D finite-difference synthetics. We provide a proof-of-concept showing that future studies of the Earth’s deep interior can be improved by combining translational and rotational records.

Funder

DFG

NERC

DAAD

WWU

Publisher

Oxford University Press (OUP)

Subject

Geochemistry and Petrology,Geophysics

Reference58 articles.

1. BlueSeis3A: full characterization of a 3C broadband rotational seismometer;Bernauer;Seismol. Res. Lett.,2018

2. Dynamic tilt correction using direct rotational motion measurements;Bernauer;Seismol. Soc. Am.,2020

3. Inferring earth structure from combined measurements of rotational and translational ground motions;Bernauer;Geophysics,2009

4. Measurements of translation, rotation and strain: new approaches to seismic processing and inversion;Bernauer;J. Seismol.,2012

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