P-wave First Motion Fault Plane Solution for 09022116512e, largest event of swarm

Fault Plane Parameters for 09022116512e Fault Choice 1 Fault Choice 2 Strike(deg) 105.0 273.0 Dip(deg) 30.0 61.0 Rake(deg) -79.5 -96.0 Fault Type normal normal

Another view showing polarities
Notes. A fault plane solution (or focal mechanism) determines two possible planes for the fault; one can not determine which of the planes is the actual fault plane from this procedure alone. The strike (0 to 360 degrees is a compass direction that specifies the orientation of the fault (0 degrees is N; 90=east; 180=S, 270=W, etc). Dip is the steepness of the fault; it ranges from 0 degrees (horizontal fault) to 90 degrees (vertical fault).Rake (0-360 degrees) is an angle, measured in the plane of the fault, between the strike direction and the direction that the material on the upper side of the fault moved relative to the material on the bottom side. A strikeslip fault produces mostly horizontal motion. Reverse and Normal faults produce dip-slip motion perpendicular to the strike direction and have a component of vertical ground motion. For a reverse fault the material on the upper side of the fault moves up; for a normal fault the material on the upper side of the fault moves down.