During 27 July to 1 August, eruptive activity continued at Anatahan, with plumes rising several thousands of meters above the volcano. On 1 August the National Weather Service at Tiyan, Guam issued a volcanic ash advisory for the islands of Saipan and Tinian. A strong sulfur odor was reported by numerous residents, and ash was observed on the tips of aircraft at Saipan International Airport. According to a news article, flights leaving the airport were delayed due to a lack of visibility caused by volcanic haze.

Geological Summary. The elongate, 9-km-long island of Anatahan in the central Mariana Islands consists of a large stratovolcano with a 2.3 x 5 km compound summit caldera. The larger western portion of the caldera is 2.3 x 3 km wide, and its western rim forms the island's high point. Ponded lava flows overlain by pyroclastic deposits fill the floor of the western caldera, whose SW side is cut by a fresh-looking smaller crater. The 2-km-wide eastern portion of the caldera contained a steep-walled inner crater whose floor prior to the 2003 eruption was only 68 m above sea level. A submarine cone, named NE Anatahan, rises to within 460 m of the sea surface on the NE flank, and numerous other submarine vents are found on the NE-to-SE flanks. Sparseness of vegetation on the most recent lava flows had indicated that they were of Holocene age, but the first historical eruption did not occur until May 2003, when a large explosive eruption took place forming a new crater inside the eastern caldera.

Sources: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program, GuamPDN - Pacific Daily News