The hot crack near the sea cliff, in the immediate area of the ocean entry, has widened significantly over the past four days. On Saturday, January 28, the crack was 30 cm wide (1 foot). Today, HVO geologists in protective gear briefly entered the area and measured the crack as being 75 cm (2.5 feet). In this image comparison, the yellow stars show corresponding points in the two images. The arrow also shows how much the crack has widened.

Remarkably, grinding noises could be heard coming from the crack, and the block of sea cliff on the makai (ocean) side of the crack could be seen to move slightly. These signs indicate that the section of sea cliff around the ocean entry is highly unstable and could collapse at any time. Photo taken Wednesday, February 1, 2017 courtesy of USGS/HVO