Historical seismograms (USA network)

        STATION                           PERIOD 
    ____________________________________________________________

        1. SIT                     1904,May - 1905,Febr
           Sitka                        1904
           Alaska and Aleutians,   1909 - 1912
           USA                     1905,Jan - Dec
                                   1906,Jan - Dec
                                   1907,Jan - 1909, Oct
                                   1912 - 1915
                                   1916 - 1919
                                   1920 - 1924
                                   1924 - 1927
                                   1928 - 1930
                                   1931 - 1935
                                   1935,Oct,11 - 1941,Oct,4
                                   1941,Oct,21 - 1946,June,24
                                   1946,July,8 - 1951,Dec,29
                                   1946,July - 1951,Dec
                                   1952,Feb,13 - 1955,Dec,18


        2. BZM                     1931,May - 1934,Feb
           Bozeman                 1934,Feb,27 - 1939,Apr,22
           Montana, USA            1939,May,1 - 1945,Dec,29
                                   1946,Jan,4 - 1950,June,23
                                   1946,Jan - 1950,June
                                   1950,July,8 - 1955,June,15
                                   1955 - 1961
     

        3. UKI                     1931 - 1937
           Ukiah                   1943
           California, USA         1943,Mar,24 - 1944,Dec,13
                                   1945,Jan,1 - 1949,Oct,20
                                   1949,Oct,30 - 1954,Dec,23
                                   1955
 

        4. RCD                     1943,Jan,1 - 1952,June,23
           Rapid City              1952 - 1955
           South Dacota, USA
     

        5. SLC                     1938,Apr,11 - 1946,Jan,13
           Salt Lake City          1946,Jan - 1951,May
           Utah, USA               1951,June - 1952,Apr
                                   1952 - 1955
     

        6. REGIS                   1909 - 1936,Nov
                                   1936,June - 1946,July
     

        7. CSC                     1931,Jan,1 - 1936,Sep,19
           Columbia                1936,Sep,18 - 1945,Dec,29
           South Carolina, USA     1946,Jan - 1952,Dec
                                   1946 - 1952
                                   1953 - 1955
                                   1960 - 1961
                                                                   

        8. LIN                     1940,Jule,9 - 1947,Dec,31
           Lincoln                 1948,Jan,21 - 1955,Oct,14
           Nebraska, USA           1955 - 1956


        9. BEC                     1939 - 1943
           Bermuda                 1944 - 1947
           Bermuda, USA            1947,Apr,1 - 1950,July,1950
     

       10. SJP                     1946,Jan - 1946,June
           San Juan                1946,June - 1946,Dec
           Puerto Rico             1952,Jan - 1952,Apr
                                   1952,May - 1952,Aug
                                   1952,Mar,3 - 1952,Dec,9


       11. TUC                     1946,Apr - 1946,June
           Tucson                  1946,Oct - 1946,Dec
           Arizona, USA            1952,Apr,4 - 1952,Dec,10
                                   1952,Sep - 1952,Dec
     

       12. HON                     1946,Jan - 1946,Feb
           Honolulu                1946,Mar - 1946,May
           Hawaii, Hawaiian        1946,June - 1946,Aug
           Islands, USA            1946,Sep - 1946,Oct
                                   1946,Nov - 1946,Dec
                                   1952,Jan (part I)
                                   1952,Jan - 1952,May (part II)
                                   1952,Feb - 1952,Apr (part I)
                                   1952,May - 1952,June (part I)
                                   1952,July - 1952,Sep (part I)
                                   1952,Aug,6 - 1952,Dec,11
                                   1952,Nov - 1952,Dec (part I)
                                   1952,June - 1952,Dec (part II)
                                                                   

       13. CMO                     1946,Jan - 1946,Mar
           College                 1946,Apr - 1946,Aug
           Alaska and Aleutians,   1946,Sep - 1946,Dec
           USA                     1950,Jan - 1950,Dec
                                   1952,Jan - 1952,Feb (part I)
                                   1952,Jan - 1952,Dec (part II)
                                   1952,Jan - 1952,May
                                   1952,Apr,4 - 1952,Dec,6
                                   1952,Jan - 1952,Dec
                                   1952,Jan - 1952,May (part III)
                                   1952,June - 1952,Dec (part III)
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Last revision September 21, 1995