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Source model for the M w 6.7, 23 October 2002, Nenana Mountain Earthquake (Alaska) from InSAR
Author(s) -
Wright Tim J.,
Lu Zhong,
Wicks Chuck
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 - 10.1029/2003gl018014
Subject(s) - hypocenter , geology , seismology , interferometric synthetic aperture radar , crust , geodesy , slip (aerodynamics) , source model , synthetic aperture radar , induced seismicity , geophysics , remote sensing , physics , theoretical computer science , computer science , thermodynamics
The 23 October 2002 Nenana Mountain Earthquake (M w ∼ 6.7) occurred on the Denali Fault (Alaska), to the west of the M w ∼ 7.9 Denali Earthquake that ruptured the same fault 11 days later. We used 6 interferograms, constructed using radar images from the Canadian Radarsat‐1 and European ERS‐2 satellites, to determine the coseismic surface deformation and a source model. Data were acquired on ascending and descending satellite passes, with incidence angles between 23 and 45 degrees, and time intervals of 72 days or less. Modeling the event as dislocations in an elastic half space suggests that there was nearly 0.9 m of right‐lateral strike‐slip motion at depth, on a near‐vertical fault, and that the maximum slip in the top 4 km of crust was less than 0.2 m. The Nenana Mountain Earthquake increased the Coulomb stress at the future hypocenter of the 3 November 2002, Denali Earthquake by 30–60 kPa.