The eruption in August 1970 in the South Shetland Islands, Antarctica, was the most violent explosion that has occurred over the past four years of recent activity. Fine-grained salty tephra of mugearite composition was spread over the northern half of the 14 km-wide island from 5 maar-type marine craters and 7 land vents. One land crater was developed in glacial ice. Further activity is anticipated.

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