Fig. 6.From: Caldera structure of submarine Volcano #1 on the Tonga Arc at 21°09′S, southwestern Pacific: Analysis of multichannel seismic profilingSchematic diagram showing a possible sequence of events associated with the formation of the caldera in Volcano #1. (a) Initiation of asymmetric collapse. (b) Repeated eruptions and further subsidence. (c) Buildup of the V1P1 cone and neovolcanic eruption along the southwestern rim. (d) Present geologic structure pertaining to Fig. 3.Back to article page