þ7material from a single



eruptive (nonsustained) eruption, such as a single blast or column



collapse. The scale of turbulence and current thickness is greatly



exaggerated in order to show dividing streamlines. a. Blocking of



high concentration basal part of the transport system. Diverted flows



move downstream at angles to the plane of section. b. Downslope



drainage of rapidly accumulating depositional system. c. Secondary



pyroclastic flows in valleys developed from runoff of depositional



system and blocking of high concentration parts of the current. d.



Dividing streamlines demarcating density stratification leading to



decoupling.<p>


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