The largest earthquake in the California/Nevada region was a Mb 3.8
(NEIS) in the Ukiah area of northern California. This was the largest
earthquake in Northern California since a Ml 4.1 near Redding on
Jan 27, 2002. It is the second light earthquake in the Central/Northern
California region in the past three days. Of four earthquakes of Ml>=3.5
in the northern and Central California (NCSN) region since Jan 1, 2002,
three have occurred in the past 8 days (since April 18). The fourth was the
4.1 on Jan 27, 2002. NCSN also lists three events of Ml>=3.5 off the
coast of Northern California under the Pacific Ocean and one in the
Mammoth Lakes region. So the past 8 days have represented a substantial
increase in seismic energy release in the region over the rest of 2002. In fact
it represents the most seismic energy released in any 8-day period this year
in the area.
Following are the events listed by NCSN as Ml>=3.5 thus far during this year.

M D HR M S YEAR LAT LONG DEP MAG

1 10 0 44 51 2002 40.442 -126.072 23 3.80 Off Coast of No. California
1 27 12 36 31 2002 40.598 -122.377 4 4.07 Redding/Burney area, No. California
3 10 19 59 5 2002 37.542 -118.871 10 3.73 Mammoth Lakes/Bishop
3 27 3 53 4 2002 40.288 -125.205 38 4.39 Off Coast of No. California
4 1 8 49 58 2002 40.410 -125.112 0 3.71 Off Coast of No. California
4 18 11 35 40 2002 38.790 -122.773 3 3.54 Geysers region, No. California
4 23 11 59 20 2002 36.866 -121.608 8 3.63 Aptos, Central California
4 26 11 1 26 2002 39.040 -123.125 5 3.80 Ukiah, Northern California
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