Abstract
Submarine slope instability and subsequent soil flows may have disastrous consequences for offshore structures and pipe lines. A theoretical viscous flow model has been applied to analyse some submarine slides and subaerial quick clay slides for which flow velocity observations are available. The submarine slides range in size from a small coastal slide which ran out about 1 km to the enormous Grand Banks slide which ran out more than 700 km at apparent speeds greater than 25 m/s. The viscous soil flow analysis modelled the runout of these slides very well, indicating that soil flow may be an important factor in the runout of sometimes very large and rapidly moving submarine slides. The analyses of field data provide some guidance on the appropriate soil input viscosities. There are still many questions regarding the development of flow geometry and these may be answered by means of detailed field studies of existing submarine slide deposits.
Published Version
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