<div>The following is based mostly on observations by visitors and staff, with some correlations with downloaded information from loggers deployed in the basin.</div> <div> </div> <div> Norris Geyser Basin Disturbance 2010 Since disturbance began, Pearl Geyser began erupting for the first time this season. Veteran’s crater is dry. Sagebrush springs, including Mini Pearl, are quite actively erupting. Curiously, Porkchop’s temperature has dropped since the start of disturbance. Emerald and Cistern are at rolling boils. There is a strange spike on 8/25 on Echinus’ channel temperature logger, but no corresponding spike in discharge into Tantalus, so we’re not certain that we had an Echinus eruption. The weir data shows a large spike in discharge in Tantalus occurring on 8/28, but we are not sure what has caused that. The disturbance is affecting both Porcelain and Back Basin, with increased temperatures recorded on both sides. Constant Geyser has really tapered off since disturbance, and temperature loggers on Steamboat seem to confirm that it has been “zapped” since the start of disturbance (one curious thing with Steamboat this season—it seems to have a cycle of 3 days of minor eruptions, then a lull for around 12 hours…hmm…). Minor eruptions are less frequent and powerful than before. The most exciting change has been with Vixen Geyser. The first reported eruption of Vixen for the season was 6/30, and intervals were pretty long—around 1 hour or so between, and eruptions were minor. Since the disturbance began, intervals have shortened to roughly 20-25 minutes, with some major eruptions. We had our first report of disturbance events on 8/26, but downloads from the loggers indicate that the disturbance really began 8/24. Disturbance seems to be going strong! Denise Herman</div>