Silverthrone Caldera

The Silverthrone Caldera is a potentially active caldera complex in southwestern British Columbia, Canada, located over 350 kilometres (220 mi) northwest of the city of Vancouver and about 50 kilometres (31 mi) west of Mount Waddington in the Pacific Ranges of the Coast Mountains. The caldera is one of the largest of the few calderas in western Canada, measuring about 30 kilometres (19 mi) long (north-south) and 20 kilometres (12 mi) wide (east-west). Mount Silverthrone, an eroded lava dome on the caldera's northern flank that is 3,160 metres (10,370 ft) high may be the highest volcano in Canada.

The main glaciers in the Silverthrone area are the Pashleth, Kingcome, Trudel, Klinaklini and Silverthrone glaciers. Most of the caldera lies in the Ha-Iltzuk Icefield, which is the largest icefield in the southern half of the Coast Mountains; it is one of the five icefields in southwestern British Columbia that thinned between the mid-1980s and 1999 due to global warming. Nearly half of the icefield is drained by the Klinaklini Glacier, which feeds the Klinaklini River.

The Silverthrone Caldera is very remote and rarely visited or studied by geoscientists, such as volcanologists. It can be reached by helicopter or— with major difficulty— by hiking along one of the several river valleys extending from the British Columbia Coast or from the Interior Plateau.

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Garibaldi Volcanic Belt - Geology - Northern Segment
... Silverthrone Caldera is the largest and best-preserved of the two caldera complexes in the northern Garibaldi chain, the other being the Franklin Glacier ... The caldera has a diameter of 20 km (12 mi) and contains breccia, lava flows and lava domes ... Like Franklin to the east-southeast, the geology of Silverthrone is poorly known due to minimal studies ...
Silverthrone Caldera - Geology - Eruptive History
... Very little is known about Silverthrone’s eruptive history ... However, as at other calderas, eruptions at Silverthrone are explosive in nature, involving viscous magma, glowing avalanches of hot volcanic ash and pyroclastic flows ... Silverthrone is considerably younger than its nearest prominent neighbour Franklin Glacier Volcano to the east-southeast ...
Volcanology Of Canada - Western Canada - Cascadia Subduction Zone Complexes
... the large Ha-Iltzuk and Waddington icefields, it includes two large dissected calderas called Silverthrone Caldera and Franklin Glacier Volcano while the Queen Charlotte ... A few isolated volcanoes northwest of Mount Meager, such as Silverthrone Caldera and Franklin Glacier Volcano, are also grouped as part of the Garibaldi ... and rate of subduction but based on rock composition is for Silverthrone Caldera and Franklin Glacier Volcano to be subduction related ...