Michael,
SCSN has listed 14 earthquakes of any magnitude during UT April 30. Apparently
the USGS simply hasn't added these to their listing yet.
While 14 certainly is on the low end of earthquake count for the region, it is
not the record. The least number of events in Southern California on a given day
since Jan 1, 1999 is 3, recorded on April 13 and April 14 during the current quiet
period. The next is 7 events on April 16 also in the current drought. In fact April, 2002
has been the least seismic month in the past 4 years (at least - that was all that
was checked). Six of the quietest 16 days in the past 4 years have occurred in the
area in April, 2002.
Following is a listing of the 20 quietest days in the SCSN catalog starting with the
quietest.

# ev YR MO DA

3 2002 04 13
3 2002 04 14
7 2002 04 16
9 2001 12 24
10 2002 04 12
11 2001 07 06
11 2001 07 07
11 2002 04 17
12 2001 07 12
12 2002 03 17
13 1999 2 28
13 1999 3 31
13 2002 04 18
14 1999 2 6
14 1999 4 2
14 2002 04 30
15 2001 03 30
15 2001 04 02
15 2001 04 22
15 2001 11 29
15 2002 03 13
16 1999 4 6
16 1999 6 21