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Coseismic and postseismic deformation due to the 2007 M 5.5 Ghazaband fault earthquake, Balochistan, Pakistan
Author(s) -
Fattahi H.,
Amelung F.,
Chaussard E.,
Wdowinski S.
Publication year - 2015
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 - 10.1002/2015gl063686
Subject(s) - seismology , geology , seismic moment , interferometric synthetic aperture radar , fault (geology) , moment magnitude scale , slip (aerodynamics) , deformation (meteorology) , seismic gap , surface rupture , geodesy , displacement (psychology) , magnitude (astronomy) , synthetic aperture radar , geometry , psychology , oceanography , physics , remote sensing , mathematics , scaling , psychotherapist , thermodynamics , astronomy
Time series analysis of interferometric synthetic aperture radar data reveals coseismic and postseismic surface displacements associated with the 2007 M 5.5 earthquake along the southern Ghazaband fault, a major but little studied fault in Pakistan. Modeling indicates that the coseismic surface deformation was caused by ~9 cm of strike‐slip displacement along a shallow subvertical fault. The earthquake was followed by at least 1 year of afterslip, releasing ~70% of the moment of the main event, equivalent to a M 5.4 earthquake. This high aseismic relative to the seismic moment release is consistent with previous observations for moderate earthquakes ( M < 6) and suggests that smaller earthquakes are associated with a higher aseismic relative to seismic moment release than larger earthquakes.