Multimode surface waveform tomography of the Pacific Ocean: a closer look at the lithospheric cooling signature

Details Multimode surface waveform tomography of the Pacific Ocean: a closer look at the lithospheric cooling signature Multimode surface waveform tomography of the Pacific Ocean: a closer look at the lithospheric cooling signature

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.166.1384m&link_type=abstract

Geophysical Journal International, Volume 166, Issue 3, pp. 1384-1397.

Astronomy and Astrophysics

Astronomy

18

Lithosphere, Pacific Ocean, Plate Tectonics, Rayleigh Waves, Tomography

Scientific paper

We present a regional surface waveform tomography of the Pacific upper mantle, obtained using an automated multimode surface waveform inversion technique on fundamental and higher mode Rayleigh waves, to constrain the VSV structure down to ~400 km depth. We have improved on previous implementations of this technique by robustly accounting for the effects of uncertainties in earthquake source parameters in the tomographic inversion. We have furthermore improved path coverage in the South Pacific region by including Rayleigh wave observations from the French Polynesian Pacific Lithosphere and Upper Mantle Experiment deployment. This improvement has led to imaging of vertical low-velocity structures associated with hotspots within the South Pacific Super-Swell region. We have produced an age-dependent average cross-section for the Pacific Ocean lithosphere and found that the increase in VSV with age is broadly compatible with a half-space cooling model of oceanic lithosphere formation. We cannot confirm evidence for a Pacific-wide reheating event. Our synthetic tests show that detailed interpretation of average VSV trends across the Pacific Ocean may be misleading unless lateral resolution and amplitude recovery are uniform across the region, a condition that is difficult to achieve in such a large oceanic basin with current seismic stations.

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