The only magnitude 8.0 or greater earthquake in July-December 1993 happened near the Guam Island has the following parameters listed in the NEIC PDE: origin time 1993/08/08 08:34, latitude 12.98N, longitude 144.80E, depth 59 km, and M=8.2, F-E Region: 210 - SOUTH OF MARIANA ISLANDS.
Guam 1993