Lomnitz (2006) states that the problem of earthquake location is ill posed. His arguments, however, do not support that conclusion. While some earthquake location problems, such as the problem of determining four hypocentral parameters with teleseismic first arrivals only, have high condition numbers and therefore the solutions are highly sensitive to small errors in the data, the inclusion of a single station well within the epicentral cap changes the situation completely. Prof. Lomnitz’s characterization of the earthquake location problem in general as ill posed is unfounded.

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He does make some interesting points; for example, epicenters can be located with no...

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