During that time about 0.7 cubic kilometers of material was erupted to form a new peak called Southwest Trident from the former site of a large fumarolic pit .
Trident has been intermittently active in historical times , primarily between 1953 and 1974 .
During that time about 0.7 cubic kilometers of material was erupted to form a new peak called Trident   from the former site of a large fumarolic pit .
Trident has been intermittently active in historical times , primarily between 1953 and 1974 .