The 10 historical earthquakes nearest to reference event 04022601515c
located at 45.6457 122.7533 that occurred prior to 04022601515c. 
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.

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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)
1999 0716  21:33   18.1   3.1        1.3   285.4	    17.2 km  NW of Portland, OR
2003 0725  20:48   17.4   3.0        1.5   116.2	    14.8 km  NW of Portland, OR
2003 0424  19:26   17.2   3.9        1.8   141.4	    14.3 km  NW of Portland, OR
1964 1001  12:31    0.0   4.1        7.1   328.9	    23.1 km  NW of Portland, OR
1991 0722  09:04   19.8   3.5        9.1   264.5	    22.6 km WNW of Portland, OR
1972 1117  02:15   11.6   3.1       10.3    33.5	    21.5 km NNW of Portland, OR
1991 1021  00:50   20.4   3.0       10.6   261.3	    23.4 km WNW of Portland, OR
1961 1107  01:29    0.0   4.7       10.7   304.6	    26.5 km  NW of Portland, OR
1991 1018  02:49   20.2   3.1       11.2   262.7	    24.1 km WNW of Portland, OR
1968 0127  08:28   34.0   3.8       12.2   108.9	     8.4 km   N of Portland, OR

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NEAREST HISTORICAL EARTHQUAKES SORTED CHRONOLOGICALLY

Year MoDy  Hr:Mn  Depth   Mag   Distance Azimuth      Event Location
           (UT)    (km)             (km)   (Deg)
1961 1107  01:29    0.0   4.7       10.7   304.6	    26.5 km  NW of Portland, OR
1964 1001  12:31    0.0   4.1        7.1   328.9	    23.1 km  NW of Portland, OR
1968 0127  08:28   34.0   3.8       12.2   108.9	     8.4 km   N of Portland, OR
1972 1117  02:15   11.6   3.1       10.3    33.5	    21.5 km NNW of Portland, OR
1991 0722  09:04   19.8   3.5        9.1   264.5	    22.6 km WNW of Portland, OR
1991 1018  02:49   20.2   3.1       11.2   262.7	    24.1 km WNW of Portland, OR
1991 1021  00:50   20.4   3.0       10.6   261.3	    23.4 km WNW of Portland, OR
1999 0716  21:33   18.1   3.1        1.3   285.4	    17.2 km  NW of Portland, OR
2003 0424  19:26   17.2   3.9        1.8   141.4	    14.3 km  NW of Portland, OR
2003 0725  20:48   17.4   3.0        1.5   116.2	    14.8 km  NW of Portland, OR