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are discussed, and some difficulties are shown to arise within the conventional
approach. The statistical basis of the commonly employed location
procedure is examined, in orded to clarify under which assumptions it can
be considered as correct; in particular an example is given where the
validity of the probabilistic statement connected to confidence regions
is evaluated via Montecarlo simulation.
The hypocentre location problem is next re-examined regarding it as
a measurement problem: in this scheme, special attention is paid to the
analysis of the features of the measurement instrument, and to the
problem of the possibility of repeating the trials.
The analysis suggests that the attention should be shifted on to joint
treatment of several events, including a different probabilistic interpreta-tion ot confidence regions, in order to overcome the inadequacies which
have been pointed out.
Accordingly, the joint focal and crustal parameters determination is
interpreted as a change of perspective in seismological measurements.
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