There have been quakes in the past in this part of Yorba Linda. Using the same catalog Glen used in his post, I find 40 quakes within 10km of this 3.2 since 1973.

Brian

FILE CREATED: Mon Sep 3 20:37:20 2007
Circle Search Earthquakes= 41
Circle Center Point Latitude: 33.922N Longitude: 117.766W
Radius: 10.000 km
Catalog Used: PDE
Data Selection: Historical & Preliminary Data

CAT YEAR MO DA ORIG TIME LAT LONG DEP MAGNITUDE IEFM DTSVNWG DIST
NFPO km
TFS

PDE 1973 11 19 185756.40 33.97 -117.78 8 3.10 MLPAS .. . ....... 5
PDE 1973 11 19 203921.90 33.97 -117.78 8 3.00 MLPAS .. . ....... 5
PDE 1975 02 18 094825.60 33.92 -117.75 3 4.00 mb GS .F . ....... 1
PDE 1977 09 14 213523.30 33.88 -117.82 2 2.70 MLPAS .F . ....... 6
PDE 1977 09 19 103454.60 33.95 -117.78 9 2.70 MLPAS .F . ....... 3
PDE 1978 06 04 035717.30 33.92 -117.83 6 3.50 MLPAS 5F . ....... 6
PDE 1978 09 03 181046.50 33.95 -117.72 6 3.80 MLPAS 5F . ....... 5
PDE 1978 09 22 031326.80 33.87 -117.83 4 2.90 MLPAS .F . ....... 8
PDE 1980 01 18 090930.90 33.93 -117.73 7 3.10 MLPAS .. . ....... 3
PDE 1982 08 27 042537.60 33.93 -117.82 17 3.10 MLPAS 5F . ....... 4
PDE 1984 12 14 212804.70 33.89 -117.82 3 3.10 MLPAS .F . ....... 6
PDE 1991 10 02 184221.30 33.88 -117.77 8 3.40 MLPAS .. . ....... 4
PDE 1993 03 03 173724.43 33.97 -117.85 4 2.90 MLPAS .F . ....... 9
PDE 1993 03 03 174558.86 33.97 -117.85 4 2.50 MLPAS .F . ....... 9
PDE 1994 07 20 221645.34 33.90 -117.87 4 2.60 MLPAS .. . ....... 9
PDE 1996 07 28 060243.25 33.95 -117.82 10 2.80 MDPAS .F . ....... 5
PDE 1997 01 31 122541.01 33.91 -117.79 8 3.50 MLGS .F . ....... 2
PDE 1997 07 29 201729.63 33.88 -117.83 4 2.70 MLPAS .F . ....... 7
PDE 1998 01 05 181406.47 33.95 -117.71 11 4.30 MLPAS .F . ....... 6
PDE 2000 03 11 214607.81 33.84 -117.74 3 3.10 MLPAS .F . ....... 9
PDE 2000 10 17 185832.40 33.87 -117.86 6 2.90 MLPAS .F . ....... 9
PDE 2001 04 13 115012.49 33.88 -117.69 3 3.60 MLPAS 5F . ....... 8
PDE 2001 04 20 233656.95 33.88 -117.85 10 2.80 MLPAS 4F . ....... 9
PDE 2001 09 17 011449.01 33.92 -117.77 11 3.10 MLPAS 3F . ....... 0
PDE 2001 12 14 120135.52 33.96 -117.75 13 4.00 MLPAS 4F . ....... 4
PDE 2002 03 17 055043.14 33.87 -117.86 9 3.20 MLPAS 4F . ....... 9
PDE 2002 09 03 070851.87 33.92 -117.78 12 4.80 MLPAS 5F . ....... 1
PDE 2002 09 03 071551.48 33.92 -117.77 11 2.90 MLPAS .F . ....... 0
PDE 2002 09 03 112839.62 33.92 -117.77 10 2.90 MLPAS .F . ....... 0
PDE 2002 09 03 200324.23 33.92 -117.78 7 2.70 MLPAS 3F . ....... 1
PDE 2002 09 06 012706.60 33.92 -117.77 11 3.00 MLPAS .F . ....... 0
PDE 2003 12 29 004912.09 33.97 -117.82 16 3.50 MLPAS 3F . ....... 7
PDE 2003 12 29 010346.77 33.97 -117.82 16 3.20 MLPAS 3F . ....... 7
PDE 2004 03 04 123516.74 33.88 -117.86 10 2.90 MLPAS 4F . ....... 9
PDE 2004 09 21 081422.69 33.96 -117.76 9 2.80 MLPAS 3F . ....... 4
PDE 2004 10 25 214926.37 33.86 -117.72 4 2.90 MLPAS 4F . ....... 7
PDE 2004 11 22 053906.66 33.85 -117.78 9 3.00 MLPAS 3F . ....... 7
PDE 2005 01 27 224819.63 33.86 -117.75 9 2.90 MLPAS 3F . ....... 7
PDE 2005 07 25 071640.27 33.87 -117.82 5 2.70 MLPAS 3F . ....... 7
PDE-W 2006 01 12 163141 33.93 -117.80 9 2.70 MLPAS 3F . ....... 3
PDE-W 2007 07 15 170757.50 33.88 -117.77 3 2.70 MLPAS 3F . ....... 5