Physics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3804303d&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 4, CiteID L04303
Physics
1
Seismology: Surface Waves And Free Oscillations, Seismology: Tomography (6982, 8180), Seismology: Mantle (1212, 1213, 8124), Seismology: Core (1212, 1213, 8124)
Scientific paper
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 0S2, 0S3, 0S4, 2S1 and 1S2. Singlet frequencies of these modes have been measured previously using gravimeters, but here we use seismic records to observe splitting functions for 0S2 and 2S1 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 0S3, 0S4 and 1S2 compared with previous studies. The new splitting function measurements can easily be implemented in future tomographic modelling of aspherical velocity and, particularly, density structure.
Deuss Arwen
Ritsema Jeroen
van Heijst Hendrik
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