68. The beach ball figure below depicts the focal
mechanism of an earthquake. The shaded and unshadedportions indicate a compressional and dilatational
quadrant, respectively. FP1 is the fault plane solution.
The focal mechanism and FP1 represent
A. A thrust fault with strike 45 degree and dip 30
degree with the tension axis in the compression
quadrant
B. A normal fault with strike 45 degree and dip 30
degree with the tension axis in the compression
quadrant
C. A thrust fault with strike 225 degree and dip 60
degree with the pressure axis in the compression
quadrant
D. A normal fault with strike 225 degree and dip 60
with the pressure axis in the compression quadrant
