Figure 17.-Oblique aerial photograph on 14 March 1980 of a recent rock avalanche that fell onto Murchison Glacier during December 1979. Such deposits are readily visible on satellite images. Their movement and distortion enable ice movement to be monitored by satellite imagery. Photograph by Trevor J. H. Chinn, New Zealand Geological Survey, film negative no. 8025.

U.S. Geological Survey, U.S.Department of the Interior
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