With almost 250 miles of extremely low pressure from hurricane Hiayan over the ocean, you can pretty much count on a massive earthquake!!

Storm surges occur as strong winds blow toward the shore push water in its direction causing much of the coastal flooding. The central pressure of the hurricane is low enough in altitude that the lack of atmospheric weight above the eye and eye wall of the hurricane causes a bulge in the ocean surface. This low pressure lifts up the ocean surface in the center.

This hurricane is going directly over the Philippine trench, Depth 35,640 feet, and relatively close, given its huge size, to have an effect on the Mariana trench, Depth 36,069 feet.

My guess at this point is an 8.0+ in the region in the next two days.