Volcanic Activity

Approximately 10,000 years ago, a violently explosive eruption evacuated about 30 km³ of molten rock from Deception Island. The volcano summit collapsed to form the Port Foster caldera. The volcano was particularly active during the 18th and 19th centuries. 20th century eruptions occurred during two short periods, between 1906-1910 and 1967-1970. In 1992, enhanced seismic activity on Deception Island was accompanied by ground deformation and increased water temperatures. Today, the floor of Port Foster is rising rapidly in geological terms, and there are areas of long term geothermal activity. It is classified as a restless caldera with a significant volcanic risk.

Volcanic Alert Scheme

GREEN - No eruption is expected.
This is the normal alert state for Deception Island.

YELLOW - Some anomalies in the volcanic system.
A volcanic crisis could arise at some point in the future. There are small but significant anomalies in the volcanic parameters recorded.

ORANGE - Increased probability of a volcanic eruption in the near future.
Significant increase in volcanic parameters anomalies recorded. New changes in volcanic parameters appears.

RED - High probability of an imminent volcanic eruption or ongoing volcanic extent.
High probability of volcanic eruption confirmed with a significant change in the number of volcanic parameters anomalies.

The full Alert Scheme and Escape Strategy can be accessed here.