Alaska’s Mount Redoubt remained active on April 7, 2009, releasing a plume that blew across the Cook Inlet toward the southeast. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite took this picture the same day. The volcanic plume’s light color in this image suggests that the volcanic emissions contain more water vapor than ash. Earlier emissions had coated the snowy ground with muddy-brown volcanic ash, and some traces of that ash linger northeast of the volcano. The current plume casts a shadow toward the northeast, over the land and the water.
According to the Alaska Volcano Observatory, Redoubt’s activity continued on April 7, 2009, with varied levels of ashfall and lava flows from the summit crater. In addition, a new lava dome appeared to be forming at the summit crater. The observatory reported a steam and ash plume rising to an altitude of 4,570 to 6,100 meters (15,000 to 20,000 feet) above sea level.
After keeping volcanologists waiting for weeks, Mount Redoubt erupted five times in one night, beginning on March 22, 2009. The volcano followed up with more eruptions in April, and showed continued signs of unrest in early May.
In contrast to the explosive eruptions of the previous week, ash emissions from Mount Redoubt became more frequent but confined to lower altitudes on March 30, 2009. The commercial satellite GeoEye-1 captured a high-resolution view of the volcano the same day.