Historic Earthquakes

Magnitude 6.9 COSTA RICA
1999 August 20 10:02:21 UTC

 Dep  25           No. of sta: 57
 Moment Tensor;   Scale 10**19 Nm
   Mrr= 1.13       Mtt=-0.74
   Mff=-0.40       Mrt= 1.02
   Mrf=-0.55       Mtf= 0.55
  Principal axes:
   T  Val=  1.63  Plg=67  Azm= 23
   N        0.00       4      122
   P       -1.63      23      214
 Best Double Couple:Mo=1.6*10**19
  NP1:Strike=312 Dip=23 Slip= 101
  NP2:       121     68        86

Moment Tensor Solution