Esr dating wikipedia
An uplift rate of 0.2 millimeters annually has been estimated from uranium series dating ( No evidence has been found of surface faulting, but a 3-kilometer-long (2 mi) set of bedding-parallel cracks was observed on the northwestern flank of the Ramkan syncline, interpreted as representing probable slip along bedding planes, possibly due to further tightening of this fold.More than 400 minor aftershocks followed the main quake, 36 of which were greater than magnitude 2.5.The earthquake occurred in a remote area during the middle of the day, limiting the number of fatalities.The pattern of displacement is consistent with a north-dipping fault rupturing between about 8 kilometers (5 mi) and 4 kilometers (2 mi) in depth, which also provides a good match to the results of seismic modeling using body waves, The mismatch between the orientation of the fault planes that caused the earthquake and the observed surface folds suggests that deformation at these two levels is decoupled by the presence of a detachment, possibly within marl layers.
Most aftershocks occurred at significantly greater depths than the mainshock and are dominated by strike-slip focal mechanisms.
The most active part of the Zagros is the Simply Folded Belt, which is characterised by large folds formed above a layer of late Neoproterozoic to Early Cambrian Hormuz salt, which locally reaches the surface in the crests of some anticlines as salt diapirs.
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