Mount St. Helens, Washington, USA

On 21 February, CVO lowered the Alert Level for Mount St. Helens from Watch to Advisory and the Aviation Color Code from Orange to Yellow. Comparison of photographs taken by remote cameras during late January to mid-February 2008 showed no evidence of extrusion. In addition, very few earthquakes were recorded since late January, gas emissions [...]

Mount St. Helens, Washington, USA

Data from deformation-monitoring instruments indicated that during13-19 February lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. Clouds and snow cover frequently inhibited visual observations.
Source: Cascades Volcano Observatory - “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano [...]

Mount St. Helens, Washington, USA

Data from deformation-monitoring instruments indicated that during 6-12 February lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. Clouds and snow cover frequently inhibited visual observations.
Source: Cascades Volcano Observatory - “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s [...]

Mount St. Helens, Washington, USA

Data from deformation-monitoring instruments indicated that during 2-8 January lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. A new small spine was seen on top of the active lobe during an overflight on 31 December. The spine was hot enough to be snow-free [...]

Mount St. Helens, Washington, USA

Data from deformation-monitoring instruments indicated that during 26 December-1 January lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. Clouds occasionally inhibited visual observations.
Source: Cascades Volcano Observatory - “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards [...]

Mount St. Helens, Washington, USA

Data from deformation-monitoring instruments indicated that during 19-25 December lava-dome growth at Mount St. Helens continued. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. Clouds occasionally inhibited visual observations.
Source: Cascades Volcano Observatory - “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”

Mount St. Helens, Washington, USA

 Data from deformation-monitoring instruments indicated that during 5-11 December lava-dome growth at Mount St. Helens continued. Based on interpretations of flow-monitoring system data, lahars flowed out of the crater on 4 December, after a weather system passed through the region. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. Clouds occasionally [...]

Mount St. Helens, USA

Data from deformation-monitoring instruments indicated that during 28 November-4 December lava-dome growth at Mount St. Helens continued. Small inflation-deflation events occurred which were interpreted as dome-growth pulses. Seismicity persisted at low levels, punctuated by M 1.5-2.5, and occasionally larger, earthquakes. A GPS receiver on the W part of the active spine showed continued SW advance [...]