Fault Model of the 1974 Izu-Oki Earthquake Deduced from the Vertical Crustal Movement

A fault model of the 1974 Izu-Oki Earthquake was studied by the vertical crustal movement and the distribution of the after shocks.An assumed fault type is the right lateral pure strike slip, and the fault parameters are as follows, length=15km, width=8km, dip angle=75°, and dislocation=130cm.The stress field in the southern part of the Izu peninsula deduced from this fault motion is the north-south directional compressive field. This stress field represents that the Izu peninsula is compressed from south to north by the movement of the Philippine Sea Plate.