TY - JOUR
T1 - Numerical investigations of tsunamis generated by pyroclastic flows from the Kikai caldera, Japan
AU - Maeno, Fukashi
AU - Imamura, Fumihiko
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/12/16
Y1 - 2007/12/16
N2 - Tsunamis generated by a voluminous pyroclastic flow entering the sea during a caldera-forming eruption at the Kikai caldera, Japan, were investigated by using a two-layer shallow water model which is limited to the source conditions and their impact on coastal areas. Volume flux of the dense component of the pyroclastic flow was controlled by a sine function. Results showed that the maximum height of the tsunami was largest in models with the largest volume flux of the flows. The approximate source conditions of the tsunami, which can stir sediment particles on the sea floor, were investigated using the non-dimensional boundary shear stress. Results from our simulation showed that the shear stress to initiate movement of sediment particles was not easily achieved in areas where there was evidence of a tsunami. A caldera collapse is thought more likely to have generated the huge tsunami rather than a pyroclastic flow.
AB - Tsunamis generated by a voluminous pyroclastic flow entering the sea during a caldera-forming eruption at the Kikai caldera, Japan, were investigated by using a two-layer shallow water model which is limited to the source conditions and their impact on coastal areas. Volume flux of the dense component of the pyroclastic flow was controlled by a sine function. Results showed that the maximum height of the tsunami was largest in models with the largest volume flux of the flows. The approximate source conditions of the tsunami, which can stir sediment particles on the sea floor, were investigated using the non-dimensional boundary shear stress. Results from our simulation showed that the shear stress to initiate movement of sediment particles was not easily achieved in areas where there was evidence of a tsunami. A caldera collapse is thought more likely to have generated the huge tsunami rather than a pyroclastic flow.
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U2 - 10.1029/2007GL031222
DO - 10.1029/2007GL031222
M3 - Article
AN - SCOPUS:39049094150
VL - 34
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 23
M1 - L23303
ER -