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DISCONTINUITY ORIENTATION IN JIGSAW CLASTS FROM VOLCANIC DEBRIS AVALANCHE DEPOSITS AND IMPLICATIONS FOR EMPLACEMENT MECHANISM
Session: Landslide and Slope Stability / Mouvements de terrain et stabilité des pentes
Marc-Andre Brideau, BGC Engineering Inc. (Canada)
Jonathan Procter, Massey University (New Zealand)
Jigsaw fractures in clasts have been noted in the deposit of large (>1 Mm3) volcanic debris avalanches and non-volcanic rock avalanches at numerous locations around the world but they have rarely been systematically studied. This project applied terrestrial photogrammetry techniques to characterize the discontinuity orientation of jigsaw clasts found in the debris avalanche deposits around Mt. Taranaki. Mt. Taranaki is a stratovolcano located on the North Island of New Zealand. The orientation of 355 discontinuities was obtained from clasts at 7 stations on the west side of Mt. Taranaki. The constant discontinuity orientation in clasts from stations separated by approximately 10 km has implications on the landslide debris transport and emplacement mechanisms. Two emplacement mechanisms that could result in a consistent orientation pattern in the jigsaw clasts at all 7 stations are discussed and compared with the field observations at Mt. Taranaki.
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