focal depth


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fo·cal depth

, depth of focus
the greatest distance through which an object point can be moved while maintaining a clear image.
Synonym(s): penetration (3)

fo·cal depth

, depth of focus (fō'kăl depth, fō'kŭs)
The greatest distance through which an object point can be moved while remaining in focus.

fo·cal depth

, depth of focus (fō'kăl depth, fō'kŭs)
The greatest distance through which a point can move in focus.
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References in periodicals archive ?
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=5.2, 2009) and SE Khash with 82 Km focal depth (Ms=7.7, 2013).
--The maximum possible focal depth [F.sub.2max] (6) for the given setup was calculated;
With appropriate combinations of these adjustments ([R.sub.r]), an optical needle ("long focal depth") can be generated in the focal region of high NA lens as it is shown in Figure 3.
more distant stations), dominat influence on both the epicenter and the focal depth estimations.
We calculated the RTL and Q parameters [9,13], that is, the possible time and spatial variation of the seismic quiescence, and to this end we made some choices about the input parameters; if we consider, for example, the M = 7.3 earthquake, which occurred in the western region of Tottori prefecture, Japan, on 6, October, 2000, Huang [9] adopted a distance [r.sub.0] = 50 km, [t.sub.0] = 1 year, and a focal depth ([d.sub.0]) of 30 km.
The 1993 sequence was concentrated in the Dakar and Tiran deeps in the southern part of the Gulf having focal depths not exceeding 26 km.
Focal depths were determined using the Kovesligethy formula for the main earthquake and the strongest aftershock on December 2, 2004.
(local time) and its focal depth was measured at 10 km.
To estimate the preferred seismogenic depth of each segment, the frequency histogram of aftershock focal depth and the regression curve of Gaussian distribution in each segment are made.
This was done as an effort to reduce the errors in the hypocentral locations determined by ISC and NEIC, since this method permits a better constrained estimate of the focal depth when a considerable number of pP phases are included.
The epicentre of the earthquake was located in the border region of Afghanistan and Tajikistan with a focal depth of 230 kilometres.

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