Hello Chris,

I only looked at the ten wettest years. I have not found data on the ten driest years. Might make a difference, but I don't know, yet. The Illinois info is at the URL. I used the PDE and SRA catalogues to check the rain vs seismicity. The two largest summations of data for precipitation are 1881 thru 1883 and 1948 thru 1950 with no observable increase in large seismic activity. The finding is limited by not having all the rainfall data. I did not check two year versus three year summations for rainfall. If the question is if Wabash seismic events are related to heavy rainfall years---then I have to think "no". Too many other events to narrow it down that way statistically. This was just a simple test to find a relationship. I can't see it. Data;; Asterisks mine....

Glen

U. S. G E O L O G I C A L S U R V E Y
E A R T H Q U A K E D A T A B A S E

FILE CREATED: Tue Apr 22 19:07:31 2008
Circle Search Earthquakes= 30
Circle Center Point Latitude: 38.450N Longitude: 87.890W
Radius: 1000.000 km
Catalog Used: SRA
Magnitude Range: 5.0 - 9.9
Data Selection: Eastern, Central and Mountain States of U.S. (SRA)

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

SRA 1811 12 16 0815 35.40 -90.40 7.20 FASRA E... ....... 405
SRA 1811 12 16 1415 35.40 -90.40 7.00 FASRA E... ....... 405
SRA 1812 01 23 15 36.30 -89.60 7.10 FASRA E... ....... 282
SRA 1812 02 07 0945 36.50 -89.60 7.30 FASRA E... ....... 263
SRA 1827 07 05 1130 38.00 -87.50 5.00 FASRA 6... ....... 60
SRA 1833 08 27 11 37.70 -78.00 5.00 FASRA 6... ....... 870
SRA 1843 01 05 0245 35.50 -90.50 6.00 FASRA 7... ....... 401
SRA 1857 10 08 10 38.70 -89.20 5.30 FASRA 7... ....... 117
SRA 1865 08 17 15 36.00 -89.50 5.30 FASRA 7... ....... 306
SRA 1867 04 24 2022 39.20 -96.30 5.10 FASRA 7... ....... 734
SRA 1875 12 23 0445 37.80 -78.00 5.00 FASRA 7... ....... 869
SRA 1877 11 15 1745 41.00 -97.00 5.00 FASRA 7... ....... 829
SRA 1882 10 22 2215 34.00 -96.00 5.50 FASRA 6... ....... 879******
SRA 1886 09 01 0251 32.90 -80.00 7.03 MwBOL X..G ....... 941
SRA 1887 08 02 1836 37.20 -88.50 5.20 FASRA 6... ....... 148
SRA 1891 09 27 0455 38.25 -88.50 5.50 FASRA 7... ....... 57
SRA 1895 10 31 1108 37.00 -89.40 6.20 FASRA 9... ....... 208******
SRA 1897 05 31 1858 37.30 -80.70 5.80 FASRA 8... ....... 644******
SRA 1909 05 26 1442 41.60 -88.10 5.00 FASRA 7... ....... 350
SRA 1909 09 27 0945 39.80 -87.20 5.40 FASRA 7... ....... 161
SRA 1917 04 09 2052 38.10 -90.20 5.00 FASRA 7... ....... 205
SRA 1929 08 12 112448.70 42.91 -78.40 9 5.20 MnST 8..G ....... 941
SRA 1952 04 09 162928.40 35.53 -97.85 10 5.00 FASRA 7... ....... 943
SRA 1965 08 14 131356.90 37.23 -89.31 1 5.00 mb GS 7..G ....... 184
SRA 1965 10 21 020439.10 37.48 -90.94 7 5.10 mb GS 6..G ....... 289
SRA 1965 12 19 221912 36.03 -89.76 1 5.30 mb GS .... ....... 315
SRA 1968 11 09 170140.50 37.91 -88.37 21 5.50 MnSLM 7..G ....... 73
SRA 1977 01 03 225648.50 37.58 -89.71 5 5.00 mb GS 6... ....... 186
SRA 1980 07 27 185221.40 38.19 -83.89 6 5.20 MnTEC 7..G ....... 350
SRA 1986 01 31 164642.30 41.65 -81.16 2 5.00 mb GS 6..G ....... 674

PDE 1974 03 27 161056.30 38.55 -90.13 10 5.60 mb GS 3F . ....... 195******
PDE 1976 03 25 004120.50 35.59 -90.48 15 5.00 LgSLM 6D . ....... 391
PDE 1977 01 03 225648.50 37.55 -89.79 5 5.00 mb GS 6D . ....... 194
PDE 1980 07 27 185221.80 38.17 -83.91 8 5.20 UKTUL 7C . ....... 349
PDE 1986 01 31 164643.33 41.65 -81.16 10 5.00 mb GS 6C . ....... 674
PDE 1987 06 10 234854.88 38.71 -87.95 9 5.10 LgSLM 6C . ....... 29
PDE 1990 09 26 131851.33 37.17 -89.58 12 5.00 LgTUL 6D . ....... 205
PDE 1991 05 04 011854.91 36.56 -89.82 5 5.00 LgBLA 6D . ....... 270
PDE 1998 09 25 195252.07 41.49 -80.39 5 5.20 LgGS 6D M ....... 723
PDE 2002 06 18 173715.17 37.99 -87.78 5 5.00 LgGS 6D . ....... 52
PDE-Q 2008 04 18 0937 38.45 -87.89 11 5.20 MwSLM .. M ....... 0******

• Wettest years