Around 7000 years ago, the current Mount Spurr summit peak formed as a new vent at the centre of the original destruction, while the current Crater Peak formed within the southern gap of the caldera rim perhaps 6000 years ago. Both centres can erupt but most eruptions have come from Crater Peak. During 2004, the summit crater again began to show indications for a high heat flow, with melting ice on the crater flank and a cauldron forming in the ice inside the crater opening a view to a warming crater lake.