This group has been working privately for some years now providing earthquake
forecasts to local networks and mitigation officials, such as here at NGDC.
Among the earthquakes they have forecast within a couple of days - with quality
comparable to that of Don's Watsonville forecast have been:
Vancouver - Dec 21, 1976 (Ms 6.7) - based on earthquake patterns
In this case the prediction was made in November for an event somewhere
on the west Coast with the maximum probability near Vancouver on Dec. 21.

Imperial Valley - October 16, 1979 - Mw 7.2, based on far-field triggering
A private forecast, later made public. The forecast was based on historical
triggering of earthquakes in southern California after great earthquakes in
the Irian Jaya area.

Whittier - Oct 1, 1987 - Mw 6.0 forecast was for a broader area of southern California
and possibly as far north as Parkfield for the 1st of October, 1987.

Loma Prieta - October 19, 1989 Mw 7.1. This forecast was received by several
in this office from this group on Oct 16. It expected a strong earthquake in the
Santa Cruz to San Francisco area within 3 days. The forecast was based on
increasing FFA triggering in the area in the previous year.

Northridge - January 16, 1994 Mw 6.8. The forecast arrived here a week before
the event and was for a large event in either the L.A. or S.F. region on Martin Luther
King holiday. The forecast was based on a series of smaller events south of that
area earlier in January and patterns similar to those observed before San Fernando
in 1971.

Mammoth Lakes - May 15, 1999 Mw 5.8. The first forecast for this event had been
made in October 1998 and had been updated for a 2 - day period surround May 14, 1999.
Based on statistical evaluation of Mammoth Lakes earthquakes.

Hector Mine - October 15, 1999 Mw 7.6. A forecast for a smaller event had been
published and was in our hands in June, 1999 for within 3 days of October 15. When
a series of forecshocks occurred on October 14, this previous forecast was updated
to include the possibility of a major aftershock of Landers within 3 days.

These are just a few of the major, successful forecasts. They have tended to
concentrate their efforts in California, but occasionally have branched out into
other areas. Up to now, all forecasts have been made privately. I am not sure
how they plan to proceed once they incorporate, however.

An impartial statistician has investigated the statistics of the forecasts published
by this group and presented a paper at an international meeting on statistical
seismology stating that the techniques being used were highly significant in a
statistical sense, and far exceeded any other technique currently being used
by professionals or amateurs in the forecasting of earthquakes.

Without compromising the proprietory nature of the techniques or the incipient
attempt to organize these into a working system, that is about all I can say for now.
All forecasts noted above have been verified by independent third parties.