GRAPHS

OKLAHOMA GEOLOGICAL OBSERVATORY, NUMBER OF EARTHQUAKES PER YEAR FOR THE
ENTIRE STATE AND SELECTED COUNTIES (PLUS ONE GROUP OF THREE COUNTIES)

YEAR  OKLAHOMA LOVE     CANADIAN GARVIN  GRADY   MC CLAIN GARVIN+GRADY
                                                          +MC CLAIN
1977   18       6        1        1       0       0        1
1978   35       5        5        0       0       1        1
1979   96      11       42        2       7       4       13
1980   49       8        4        5       0       5       10
1981   57       1        9        3      14       9       26
1982   57       2        4       11       0      12       23
1983   47       0        0        4       0       1        5
1984   36       1        0        7       0       4       11
1985   54       0        0       26       1       4       31
1986   52       0        0       13       3       3       19
1987   69       0        2       25       2      12       39
1988   48       0        2       14       0       4       18
1989   62       0        1        3       0       4        7
1990   37       0        0       14       1       1       16
1991   45       0        1       15       4       2       21
1992   53       2        0       10       1       5       16
1993   73       2        0       28       3      13       44
1994  113       0        2       33      22       9       64
1995  167       4        1       15      84       9      108
1996   75       0        2        4      16       5       25
1997  117       0        4       37      15      14       66
1998   68       0        2       18      15       6       39
1999   39       0        0        3       8       3       14
2000   29       0        2        2       1       0        3
2001   30       0        3        9       0       1       10

The Oklahoma Geological Survey's statewide seismograph network started
operation in late 1976. Because many earthquakes which are located by the
network are much smaller than those known before 1977, years before 1977
are not listed.


NUMBER OF EARTHQUAKES IN OKLAHOMA 1977-2001

NUMBER OF EARTHQUAKES IN SELECTED OKLAHOMA COUNTIES 1977-2001

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