The caldera floor continues to bulge upward at a rate of one-half inch per year, compared with two inches in 1984.

Rocks that were blasted away from the crater can still be seen on the caldera floor.

Sediments and material from landslides also covered the caldera floor.

Each caldera floor was at a slightly different elevation, and marked by a pattern of circular fractures.

A good stairway path descends from the pass to the caldera floor.

A small lake has intermittently occupied the northern caldera floor, most recently in 1988.

Two small lakes occupied the caldera floor on the west and north sides of the lava dome.

The diameter of the caldera floor is 5.6 kilometers and about 1,100 meters in depth.

It has experienced several collapses of the caldera floor, often following explosive eruptions.

A small lake occupies part of the caldera floor.