Transition zone structure in a tectonically inactive area: 410 and 660 km discontinuity properties under the northern North Sea

Details Transition zone structure in a tectonically inactive area: 410 and 660 km discontinuity properties under the northern North Sea Transition zone structure in a tectonically inactive area: 410 and 660 km discontinuity properties under the northern North Sea

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003geoji.155..193h&link_type=abstract

Geophysical Journal International, Volume 155, Issue 1, pp. 193-199.

Physics

4

Scientific paper

We report results from a year-long deployment of broad-band seismometers in Scotland to study the mantle structure in the northern United Kingdom. The region is tectonically inactive and its underlying mantle transition zone should not show unusual structure due to thermal perturbations caused by Cenozoic subduction or plume-related volcanism. The estimated 410 and 660 km discontinuity depths, estimated by receiver function stacking, are 414 +/- 5 and 655 +/- 14 km, typical of average worldwide values. There is no evidence for a discontinuity at 520 km. The 660 km discontinuity conversion is weaker than global Earth models predict by factors of 1.65-2.97, which is significant given amplitude measurement uncertainties. Either significant attenuation below 410 km or regional, non-thermal variations in 660 km discontinuity properties that decrease its velocity and density jumps to 1.9 per cent ΔVp, 4.8 per cent ΔVs and 4.8 per cent Δρ, or that broaden it to 13-35 km width could account for the lower than expected amplitudes. Lateral variations in transition zone water content around the 660 km discontinuity may be responsible for the broadening.

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