Open AccessMulti‐interferogram method for measuring interseismic deformation: Denali Fault, Alaska
Author(s) -
Biggs Juliet,
Wright Tim,
Lu Zhong,
Parsons Barry
Publication year - 2007
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2007.03415.x
Subject(s) - interferometric synthetic aperture radar , geology , seismology , geodesy , interferometry , pixel , coherence (philosophical gambling strategy) , remote sensing , deformation (meteorology) , synthetic aperture radar , computer science , artificial intelligence , oceanography , physics , quantum mechanics , astronomy
SUMMARY Studies of interseismic strain accumulation are crucial to our understanding of continental deformation, the earthquake cycle and seismic hazard. By mapping small amounts of ground deformation over large spatial areas, InSAR has the potential to produce continental‐scale maps of strain accumulation on active faults. However, most InSAR studies to date have focused on areas where the coherence is relatively good (e.g. California, Tibet and Turkey) and most analysis techniques (stacking, small baseline subset algorithm, permanent scatterers, etc.) only include information from pixels which are coherent throughout the time‐span of the study. In some areas, such as Alaska, where the deformation rate is small and coherence very variable, it is necessary to include information from pixels which are coherent in some but not all interferograms. We use a three‐stage iterative algorithm based on distributed scatterer interferometry. We validate our method using synthetic data created using realistic parameters from a test site on the Denali Fault, Alaska, and present a preliminary result of 10.5 ± 5.0 mm yr −1 for the slip rate on the Denali Fault based on a single track of radar data from ERS1/2.