Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30sde15r&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 19, pp. SDE 15-1, CiteID 2017, DOI 10.1029/2003GL017905
Physics
4
Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Parameters, Seismology: Seismicity And Seismotectonics
Scientific paper
On the basis of earthquake focal mechanisms, the state of stress along the central Denali fault, Alaska system changed after the 2002 earthquake sequence. Before the earthquake sequence, the maximum stress (σ1) was at a 60° angle with the Denali fault west of the point of its maximum curvature, fault-normal between the fault apex and the Totschunda strand, and at 50° with respect to the Totschunda fault. In the epicentral region, the post-event σ1 has rotated counter-clockwise. Along the rest of the rupture zone the sense of rotation is clockwise. The σ1 direction became nearly fault-normal along the Totschunda strand. Along the central part of the rupture, σ1 is over-rotated with σ3 being nearly vertical, promoting reverse aftershocks. This could be an indication of dynamic overshoot.
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