Maybe this one - I also posted more about it under the Mexico thread:
5.6 - OFF COAST OF JALISCO, MEXICO - 06:46.23.6 UTC

The following is from the United States Geological Survey, National
Earthquake Information Center: preliminary hypocenter for
earthquake of 1999 nov 21, OFF COAST OF JALISCO, MEXICO, about 180
miles (290 km) SW of Puerto Vallarta, Jalisco, Mexico: latitude
18.7 degrees north longitude 107.2 degrees west origin time 06 46
23.6 utc depth 60, magnitude 5.6 ms.