Physics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1081b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 15, Sept. 1988, p. 1081-1084.
Physics
15
Earthquakes, Plates (Tectonics), Rheology, Seismology, Critical Temperature, Temperature Profiles, Vertical Distribution, Vertical Motion
Scientific paper
Intermediate and deep focus earthquakes in Wadati-Benioff zones are considered, and it is suggested that although seismicity in downgoing slabs is restricted to their cold and strong interior, the seismicity distribution is not easily described as being controlled by a single lithospheric strength value. A numerical thermal model is used to compute strength contours for flow law constants reported from laboratory experiments, and it is shown that the expected pressure strengthening is large enough that the slab should have considerable strength well below the deepest seismicity. The results indicate that either a strongly depth-dependent limiting strength in downgoing slabs exists, or factors in addition to strength control the distribution of subduction zone earthquakes.
Brodholt John
Stein Seth
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