Mt. Fitzherbert

Potential ash hazards: Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that any ash clouds that rise above the crater rim today would drift northeastward.

Recent observations: Rockfalls and associated minor ash plumes continue to be generated from the growing lava dome. Yesterday crews were able to install a new seismic spider on the east side of the new lava dome. It replaces an important station that was destroyed recently by the advancing apron of rockfall debris. A couple of GPS spiders and one seismic spider on the glacier were moved slightly to avoid being swallowed in growing crevasses. Results of a flight on Wednesday show emission rates of volcanic gases remain little changed—about 80 tonnes per day of sulfur dioxide and 880 tonnes per day of carbon dioxide. Analysis of a rock sample collected from the dome on July 13 shows no change in the composition of lava being extruded.