The 10 historical earthquakes nearest to reference event 04081621055c
located at 46.6838 121.5042 that occurred prior to 04081621055c. 
The list includes events with magnitude (Mag) > 3.0 and gives distance
and azimuth  from the reference event to each historical earthquake.

Date is given in Universal Time (UT). Subtract 8 hours to get Pacific
Standard time (PST) or 7 hours for PDT. Azimuth is the compass
direction (measured clockwise from North, 0-360 degrees) of the
earthquake from the location of the reference event. Usually, depths
listed as 0.0 km are either unknown or very unreliable.
Abort (core dumped)
Abort (core dumped)

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NEAREST HISTORICAL EARTHQUAKES SORTED BY DISTANCE FROM REFERENCE EVENT

Year MoDy  Hr:Mn  Depth   Mag   Distance Azimuth      Event Location
           (UT)    (km)             (km)   (Deg)
Site  Lat   Site    0.0   0.0        0.0     0.0	
Event_Date___(UT) Depth    Mag    0.0   0.0        0.0     0.0	
1974 0420  03:00    5.6   4.7        4.2    31.5	
1974 0421  14:08    4.8   3.5        5.7    82.1	
1982 0123  15:31    3.3   3.2       18.1   147.6	
1969 1009  17:07    0.0   4.3       18.6   299.5	
1981 0528  08:55    3.0   4.6       18.9   154.6	
1981 0528  09:10    3.2   5.0       19.5   154.4	
1975 0418  04:57    5.1   3.9       26.3   344.4	
2002 0219  18:42    0.0   3.2       27.2   315.7	

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NEAREST HISTORICAL EARTHQUAKES SORTED CHRONOLOGICALLY

Year MoDy  Hr:Mn  Depth   Mag   Distance Azimuth      Event Location
           (UT)    (km)             (km)   (Deg)
Site  Lat   Site    0.0   0.0        0.0     0.0	
1969 1009  17:07    0.0   4.3       18.6   299.5	
1974 0420  03:00    5.6   4.7        4.2    31.5	
1974 0421  14:08    4.8   3.5        5.7    82.1	
1975 0418  04:57    5.1   3.9       26.3   344.4	
1981 0528  08:55    3.0   4.6       18.9   154.6	
1981 0528  09:10    3.2   5.0       19.5   154.4	
1982 0123  15:31    3.3   3.2       18.1   147.6	
2002 0219  18:42    0.0   3.2       27.2   315.7	
Event_Date___(UT) Depth    Mag    0.0   0.0        0.0     0.0