Focal mechanisms of many earthquakes are reversed and thrustand sometimes normal (in relation to bending of subducting oceanic lithosphere) such as NW Saravan with 69 Km focal depth (Ms=5.
The Urmieh-Sirjan province is struck by low to moderate earthquakes with low frequency, medium repeat time and down to 10Km focal depth.
Lut province experiences low earthquakes with low frequency, medium repeat time and down to 10Km focal depth.
The focal depths are in average shallower by about 0.
Above results were more or less qualitativelly expected, but we wanted to examine the quantitative values of shifts in epicenters and focal depths for the given subsets of events.
There is good agreement of instrumental magnitudes recorded by station NIE and macroseismic magnitudes calculated using the Karniks formula-confirming values of determined focal depths
9 with focal depth
of 10 kilometer was felt at 4:50 am when people were offering Fajr prayers.
With such lenses, very small discrepancies in screen lens placement can change the focal depths of the image by a couple of diopters (e.
By limiting the light bundle that reaches the eye to the paraxial rays, a pinhole optic system allows multiple focal depths to be simultaneously clear.
The limitation of the monocular lens addition is that it provides clear vision only for the two focal depths, plus and minus the DOF.
To evaluate the accuracy of the solutions obtained and analyze possible changes in epicentral coordinates and focal depths
calculations were carried systematically varying and the values of Vp/Vs and the velocity models.