Splitting function measurements for Earth's longest period normal modes using recent large earthquakes

Deuss, Arwen and Ritsema, Jeroen and Heijst, Hendrik van (2011) Splitting function measurements for Earth's longest period normal modes using recent large earthquakes. Geophysical Research Letters, 38. DOI doi:201110.1029/2010GL046115

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Abstract

Recent megathrust earthquakes, such as the 23 June 2001 Peru event, the Sumatra events of 2004 and 2005 and the 27 February 2010 Chile event, have given us the opportunity to measure splitting of the longest period normal modes. We use wave spectra to make robust measurements for modes 0 S 2 , 0 S 3 , 0 S 4 , 2 S 1 and 1 S 2 . Singlet frequencies of these modes have been measured previously using gravimeters, but here we use seismic records to observe splitting functions for 0 S 2 and 2 S 1 for the first time. Cross‐coupling with nearby modes is included to account for ellipticity and rotation of the Earth and results in significantly improved splitting function measurements for 0 S 3 , 0 S 4 and 1 S 2 compared with previous studies. The new splitting function measurements can easily be implemented in future tomographic modelling of aspherical velocity and, particularly, density structure. Citation: Deuss, A., J. Ritsema, and H. van Heijst (2011), Split-ting function measurements for Earth’s longest period normal modes using recent large earthquakes, Geophys. Res. Lett., 38, L04303, doi:10.1029/2010GL046115.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA62;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Geophysical Research Letters
Volume: 38
Identification Number: doi:201110.1029/2010GL046115
Depositing User: Sarah Humbert
Date Deposited: 11 Mar 2011 18:02
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2030

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