What is poorly constrained?

I have found this term about earthquakes and I don’t understand what it means or how can be defined in one phrase.

I tried to give a definition:

Poorly constrained is an earthquake with the hypocenter ≥ epicenter a shallow earthquake where Pp-P=0 if P=S with a high area of spreading of the
seismic waves that is creating multiple points of in depth location.

and USGS


Any help please?


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