Abstract
Time series analysis of interferometric synthetic aperture radar data reveals coseismic and postseismic surface displacements associated with the 2007 M5.5 earthquake along the southern Ghazaband fault, a major but little studied fault in Pakistan. Modeling indicates that the coseismic surface deformation was caused by ∼9cm of strike-slip displacement along a shallow subvertical fault. The earthquake was followed by at least 1year of afterslip, releasing ∼70% of the moment of the main event, equivalent to a M5.4 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. Key Points Seismic and aseismic slips on the southern end of the Ghazaband fault At least 1 year of afterslip with 70% of the coseismic moment release Smaller earthquakes have a higher aseismic relative to seismic moment release
Original language | English (US) |
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Pages (from-to) | 3305-3312 |
Number of pages | 8 |
Journal | Geophysical Research Letters |
Volume | 42 |
Issue number | 9 |
DOIs | |
State | Published - May 16 2015 |
Keywords
- Ghazaband fault
- InSAR
- coseismic
- earthquake
- postseismic
ASJC Scopus subject areas
- Geophysics
- Earth and Planetary Sciences(all)