A thrust fault is a reverse fault with a dip of 45 or less.
As all of these are thrust and reverse faults, they probably result from northeast directed regional compression.
Many of the boundaries are thrust or reverse faults.
The inland zone has a chevron folded structure with reverse faults.
The dip of a reverse fault is relatively steep, greater than 45 .
A normal fault may therefore become a reverse fault and vice versa.
The earthquake is interpreted to result from movement on a southeast-dipping reverse fault.
The difference between a thrust fault and a reverse fault is in their influence.
The focal mechanism suggests that the reverse fault is moderately-dipping to either south or north.
The northeastern flank is accompanied by a reverse fault with very little heave (10-15 m).