Article: Research from University of British Columbia has provided new information about mineralogy.

"The 2004-2006 eruption of Mount St. Helens produced a sequence of lava domes characterized by a 1-3 in thick outer carapace of highly breeciated and comminuted dacite fault rocks," researchers in Vancouver, Canada report.

"This outer layer of fault rocks is proposed to be a physical manifestation of the ''drumbeat'' microseismicity, such that magma extrusion occurred via integration of rapid, co-seismic slip along small displacement (

The researchers concluded: "Because the MSH lava had solidified prior to faulting, temperature is secondary in importance in the formation of the gouge material. Based on the amount of fault displacement per microseismic event, ...

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