Geology of Interactions of Volcanoes, Snow, and Water:
MT. SPURR, ALASKA - IMAGES

spur1.gif: 255K

          View north of Crater Peak, the active vent of Mount Spurr,
          Alaska, on 26 September 1992. Crater Peak erupted in June,
          August, and September 1992. Ash from the August eruption
          closed Anchorage International Airport. Behind the small
          steam plume is Mount Spurr. Mt. Spurr and the peak visible
          on the left define the rim of caldera, evacuated by a huge
          debris avalanche about 10,000 years ago.


spur2.gif: 380K

          View south of one of hundreds of impact craters on the
          lower southeast flank of Crater Peak. This one is of a 1-m
          (3-ft) ballistic block that landed 3.3 km (2.1 mi) from
          the vent during 19 August 1992 eruption. The block
          fragmented upon impact, parts of it lying downrange beyond
          rim of impact crater. Many of these ballistics travelled
          unusual horizontal arcs.