See also my earlier post below.
Now that I have had some time, I can speak a bit more authoritatively on these
two events off the northern Coast of California today. As usual, my memory was
somewhat flawed. Here is a bit more accurate (from catalogs) recollection.
There have been 7 events of Ml>=1.0 in the region 38.5-39.5N, 124-126W
recorded by the NCSN group. Several additional events were located in this
region, but later relocated in more mundane epicenters by NEIS. Of these 7, three
have had Ml>=2.0, not including the two today. So, today we had as many
events in this region of Ml>=2 as have been recorded in the past 20 years. Rare
events indeed.
Three events in the region have preceded moderate or large regional
events within 10 days, four events have followed moderate or large regional
events within one week.
Table - Correlations of events 38-5-39.5; 124-126W with large regional events:

Local event Ml Regional Event Location
Local Events following large regional events

11-09-80 2.1 11-08-80 Ms 7.2 Off Coast No. California
04-28-84 --- 04-24-84 Ms 6.3 Morgan Hill, California
08-19-98 2.9 08-12-98 Ms 5.3 Santa Cruz, California
05-19-99 --- 05-15-99 Ms 5.6 Mammoth Lakes, California

Local Events preceding large regional events

10-04-86 0.6 10-11-86 MS 4.7 So. of San Francisco CA
10-25-94 2.1 09-01-94 MS 7.0 Off Coast of No. California
04-05-96 1.9 04-15-96 Ms 5.6 Off Coast of Oregon