Аннотация
A program package, called HYPOSAT, has been under development that
attempts to use the maximum information possible to estimate the
hypocenter of a seismic source. The standard input parameters can
be used: arrival times of first and later onsets with backazimuths
and ray parameters (or apparent velocities). In addition, travel-time
differences between different phases observed at the same station
can be optionally used. The observed standard deviations are used
to weight all input parameters and the inversion is done with a generalized
matrix inversion code. A starting solution with a priori uncertainties
can be calculated as the intersection of all backazimuth observations.
If S observations are also available, a preliminary origin time is
estimated using Wadati's approach to estimate a source time. Global
earth models and user-defined horizontally layered local or regional
models can be used alone or together to locate seismic events. To
gain the best result from all input data, observations of all seismic
phases as defined in the IASPEI91 tables can be inverted. Station
corrections and corrections for phases with reflection points at
the earth's surface can be applied by using local velocity structures.
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