Report on St. Helens (United States) — 12 July-18 July 2006
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 12 July-18 July 2006
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2006. Report on St. Helens (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 12 July-18 July 2006. Smithsonian Institution and US Geological Survey.
46.2°N, 122.18°W; summit elev. 2549 m
All times are local (unless otherwise noted)
During 12-18 July, the lava dome at Mount St. Helens continued to grow and produce small rockfalls. On 18 July at 0956, a M 3.6 earthquake (one of the largest earthquakes during the ongoing eruption) triggered rockfalls from the spine and crater walls. Dust plumes rose above the crater rim and quickly dissipated. The hazard status remained at Volcano Advisory (Alert Level 2); aviation color code Orange.
Geological Summary. Prior to 1980, Mount St. Helens was a conical volcano sometimes known as the Fujisan of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km breached crater now partially filled by a lava dome. There have been nine major eruptive periods beginning about 40-50,000 years ago, and it has been the most active volcano in the Cascade Range during the Holocene. Prior to 2,200 years ago, tephra, lava domes, and pyroclastic flows were erupted, forming the older edifice, but few lava flows extended beyond the base of the volcano. The modern edifice consists of basaltic as well as andesitic and dacitic products from summit and flank vents. Eruptions in the 19th century originated from the Goat Rocks area on the N flank, and were witnessed by early settlers.