Page 116 - Fundamentals of Geomorphology
P. 116

LARGE-SCALE TECTONIC AND STRUCTURAL LANDFORMS          99


















































              Plate 4.1 The explosive volcanic vent that opened on 26 September 2005 after two days of nearly continuous seismic
              activity. (a) The 500-m-long, 60-m-wide vent looking north. To the right lies a 200-m-wide, 4-km-long zone of open
              fissures and normal faults that may mark the subsurface location of the dyke. Photograph by Elizabeth Baker,
              Royal Holloway, University of London. (b) View to the south from the north end of the vent. Notice the tunnel at the
              southern end. Notice the layers of ash that built up over a periods of days around the vent. The rhyolitic rocks in the
              foreground were blown out of the vent. (Photograph by Julie Rowland, University of Auckland )
   111   112   113   114   115   116   117   118   119   120   121