Take-Off Angle
Take-Off Angle :
The angle under which a seismic ray leaves the seismic source, measured from the plum line clockwise or counter-clockwise. It is 0º when taking off in the direction of the plume line, 90º when leaving the source in horizontal direction and 180º when taking off vertically upward. The take-off angles from the source have to be known (respectively calculated on the basis of certain model) when reconstructing seismic fault-plane solutions from observed first motion polarities, amplitude ratios or polarization analysis via stereographic projections of the focal sphere. See section 3.4.2 of Chapter 3 and EX 3.1 in this Manual
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