EQ History from 1998 to time of main shock
 Events are listed from geographic area 43.0666261 43.2666259 120.1998878 120.5332208
 Reference point in table is the mainshock of 9904280806

Distance and Azimuth from reference point to each earthquake
Reference point at Location   43.1707  120.3822

Event_Date___(UT) Depth  Mag  Dist(km)  Az(deg) Site Lat   Site Lon
1999 0411   14:01  23.8  1.9       2.9    277.9  43.1743   120.4178
1999 0411   21:00  24.4  2.0       2.0    295.1  43.1785   120.4050
1999 0411   21:58  26.4  2.4       7.9    280.9  43.1842   120.4780
1999 0421   10:58  20.0  2.4       2.7    120.5  43.1583   120.3535
1999 0425   02:10  27.8  1.5       4.7    306.5  43.1957   120.4283
1999 0427   23:05  16.5  3.0       2.6    245.4  43.1610   120.4112
1999 0428   08:06  24.0  3.8       0.0    140.9  43.1707   120.3822