Welded ignimbrites can be highly voluminous, such as the Lava Creek Tuff erupted from Yellowstone Caldera in Wyoming 631,000 years ago. This tuff had an original volume of at least . Lava Creek tuff is known to be at least 1000 times as large as the deposits of the 1980 eruption of Mount St. Helens, and it had a Volcanic Explosivity Index (VEI) of 8, greater than any eruption known in the last 10,000 years. Ash flow tuffs cover of the North Island of New Zealand and about of Nevada. Ash flow tuffs are the only volcanic product with volumes rivaling those of flood basalts.
welded ignimbrites can be highly voluminous such as the lava creek tuff erupted from yellowstone caldera in wyoming 631000 years ago this tuff had an original volume of at least  lava creek tuff is known to be at least 1000 times as large as the deposits of the 1980 eruption of mount st helens and it had a volcanic explosivity index (vei) of 8 greater than any eruption known in the last 10000 years ash flow tuffs cover of the north island of new zealand and about of nevada ash flow tuffs are the only volcanic product with volumes rivaling those of flood basalts