Volcanic Explosivity Index
Although the particular Volcanic Explosivity Index (VEI) of the Silverthrone Caldera is unknown, the chemistry and structure of the volcano can be compared to other calderas that have a history of producing some of the world's most violent eruptions. It is about long and wide while the Crater Lake caldera in Oregon, United States is long and wide. Such calderas are usually formed by large cataclysmic eruptions reaching 7 on the Volcanic Explosivity Index (described as "super-colossal").