THE MORPHOLOGY, GEOMETRY AND KINEMATICS OF JUDGEMENT CLIFF ROCK AVALANCHE, BLUE MOUNTAINS, JAMAICA, WEST INDIES

This paper presents the results of the author's geotechnical study of the Judgement Cliff rock avalanche (JCRA), which occurred in Jamaica during the latter part of 1692. This involved the detachment of 131-181 x 10 (super 6) cubic metres of faulted Miocene white limestone with chert nodules and minor sandstones and mudrocks, on a 38 degree overdip slope on the eastern bank of the Yallahs River near Llandewey. The rock mass failed by a combination of sliding, free falling and toppling, impacted and disintegrated near the base of the original slope and flowed downslope subsequently damming the Yallahs River. Seismic loading followed by high water pressure in clefts are thought to be the main triggers for the event. The debris travelled horizontal and vertical distances of 1.763 km and 0.44 km respectively, accumulating over an area of 1.09 x 10 (super 6) square metres. The height/length and depth/length values, hummocky surface topography and highly disintegrated nature of the deposit suggests that it was emplacement by flow of relatively dry debris.

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    GEOLOGICAL SOCIETY

    BURLINGTON HOUSE, PICCADILLY
    LONDON,   United Kingdom  W1V 0JU
  • Authors:
    • MAHARAJ, R J
  • Publication Date: 1994-8

Language

  • English

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Filing Info

  • Accession Number: 00668692
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Nov 16 1994 12:00AM