Seismic Slip and Down-Dip Strain Rates in Wadati-Benioff Zones

Details Seismic Slip and Down-Dip Strain Rates in Wadati-Benioff Zones Seismic Slip and Down-Dip Strain Rates in Wadati-Benioff Zones

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988sci...240.1317b&link_type=abstract

Science, Volume 240, Issue 4857, pp. 1317-1319

Astronomy and Astrophysics

Astrophysics

29

Scientific paper

The rate of accumulation of seismic moment in Wadati-Benioff zones is used to estimate strain rates in subducting slabs that are sinking through the asthenosphere. Between depths of 75 and 175 kilometers a typical down-dip strain rate is about 10-15 per second, which implies that slabs in this depth range typically accumulate strains of order 10-1. This result is in accord with geometrical arguments that subducted slabs must experience large membrane strains to deform to their observed shapes. Mantle seismicity (repeated catastrophic shear failure) is apparently a primary mechanism by which large membrane strains accumulate in the cold cores of subducting slabs. Slabs are penetratively deformed, and they have low flexural rigidity compared to oceanic plates at the earth's surface.

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