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: Another large section of the spine at the north end of the growing lava dome collapsed overnight in a rockfall. An M=3.3 earthquake at about 2:34 a.m. this morning was the likely trigger. Much of the smooth surface of the spine, which is created as it extrudes from the vent, has now been removed by rockfalls over the past few weeks. A minor mistake was made in the gas measurements reported in Friday's (July 29) update. The correct sulfur dioxide value is 60 tonnes per day, not 80 as reported.