During one eruption, a magma composed mostly of sodium carbonate issued from a volcanic vent that had been erupting alkali basalts.
The Mt. Merapi volcano, located 30 40 km (19 25 mi) to the north of the earthquake, had been erupting at the same time, but geophysicists were unsure if there was a causal link between the two events.
These crystals, which can form only under the intense pressure of the Earth's deep interior, must have been erupted at unbelievable speed (about 100kph) to have survived the journey to the surface intact.
"Thousands of cubic kilometres of material would have been erupted, and that's a minimum.
In the past 6,000 years, approximately of magma has been erupted from the Inyo part of the chain.
They appear to have been erupted in pulses, and continue for hundreds of meters.
The bulk of the complex appears to have been erupted between 100,000 and 500,000 years ago, but postglacial andesitic and basaltic andesite cones and lava flows are also present.
Though many phenomena were suggested to explain this fluctuation, the lava flows were found to rise 200 m above Titan's surface, consistent with it having been erupted from beneath the surface.
In the most recent volcanic activity, andesite, basalt, and rhyolite have been erupted from High Cascades volcanoes, particularly the Three Sisters, Broken Top, Mount Hood, Mount Jefferson, and Crater Lake.
An assessment is performed in teeth, which have been erupted into the oral cavity at least beyond the equator.
