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Static stress transfer during the 2002 Nenana Mountain‐Denali Fault, Alaska, earthquake sequence
Author(s) -
Anderson Greg,
Ji Chen
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl016724
Subject(s) - geology , seismology , fault (geology) , foreshock , normal fault , slip (aerodynamics) , intraplate earthquake , sequence (biology) , strike slip tectonics , aftershock , tectonics , physics , thermodynamics , genetics , biology
On 23 October 2002, the M w 6.7 Nenana Mountain earthquake occurred in central Alaska. It was followed on 3 November 2002 by the M w 7.9 Denali Fault mainshock, the largest strike‐slip earthquake to occur in North America during the past 150 years. We have modeled static Coulomb stress transfer effects during this sequence. We find that the Nenana Mountain foreshock transferred 30–50 kPa of Coulomb stress to the hypocentral region of the Denali Fault mainshock, encouraging its occurrence. We also find that the two main earthquakes together transferred more than 400 kPa of Coulomb stress to the Cross Creek segment of the Totschunda fault system and to the Denali fault southeast of the mainshock rupture, and up to 80 kPa to the Denali fault west of the Nenana Mountain rupture. Other major faults in the region experienced much smaller static Coulomb stress changes.