kopuła wulkaniczna

The first lava domes were formed approximately 20,000 years ago.

It was also erupted off the face of an advancing lava dome.

In 1992, the growth of a lava dome formed an island, which was eventually flooded by the lake.

A cone makes up the south part of the island, with its central crater filled by a lava dome.

This resulted in the formation of two small lava domes.

The following day, a lava dome rose through the center of the crater lake atop the mountain.

The most recent eruption, in 1952, formed a small lava dome on the island's coast.

Activity then remained low until July 1992 when a new lava dome started growing in the caldera.

- Glacier is still connected south of the lava dome.

The local people and scientists prepared for a big eruption, but the lava dome did not collapse.