Intraplate earthquakes and a seismically defined lateral transition in the upper mantle

Details Intraplate earthquakes and a seismically defined lateral transition in the upper mantle Intraplate earthquakes and a seismically defined lateral transition in the upper mantle

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3953t&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 23, p. 3953-3956

Physics

Geophysics

7

Exploration Geophysics: Continental Structures, Seismology, Seismology: Earthquake Dynamics And Mechanics, Tectonophysics: Dynamics Of Lithosphere And Mantle-General

Scientific paper

We show that the lateral transition in the upper mantle between the cratonic central/eastern and the tectonically active western regions of North America is narrow and deep-reaching by travel time analysis of Early Rise explosion seismic data. A concentration of enigmatic intraplate earthquakes coincides with the transition. Differential potential energy from density changes across the transition may generate a high compressional stress level which, locally, exceeds the shear strength of the lithosphere. The resultant deformation is ductile in most parts of the lithosphere, but in the brittle upper crust it explains the enigmatic intraplate earthquakes around the lateral transition in the upper mantle.

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