Landsat ETM+ panchromatic image (15-m-resolution) showing a clear view of the crater at the summit of Cleveland Volcano poking through thick clouds on 07 August 2011.  The dark feature in the middle of the crater is a small lava dome that was extruded sometime after July 7 when the last clear view of the summit area was acquired. The formation of a lava dome is consistent with observed thermal anomalies seen since July 19, 2011 suggesting that the dome extruded since that time.

The Landsat ETM+ data show that the lava dome continues to slowly grow. This image shows a dome with an approximately 60m diameter in a 200m-wide crater.

The black stripes represent data gaps in the Landsat ETM+ data caused by component failure in May 2003.