Historic Earthquakes
Magnitude 6.9 COSTA RICA
1999 August 20 10:02:21 UTC
Me 6.5 Broadband Source Parameters: BROADBAND DEPTH: 19.0 km BROADBAND FAULT PLANE SOLUTION: NP1:Strike=115 Dip=80 Slip= 120 NP2: 222 31 19 Principal Axes: T Plg=47 Azm= 56 P 29 181 RADIATED ENERGY No. of sta: 10 Focal mech. F Energy 1.4±0.4*10**14 Nm COMMENT: A small event is followed about two seconds later by a larger event. Depth from synthetics of broadband displacement seismograms based on first event.
