Journal
PURE AND APPLIED GEOPHYSICS
Volume 160, Issue 10-11, Pages 2177-2188Publisher
SPRINGER BASEL AG
DOI: 10.1007/s00024-003-2425-x
Keywords
tsunamis; landslides; seismic sources
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We use simple physical models to evaluate and compare the orders of magnitude of the energy generated into a tsunami wave by seismic dislocations and underwater slumps. We conclude that the two sources can generate tsunamis of comparable total energy. However, the slumping source is shown to be fundamentally dipolar in nature, which results in a low-frequency deficiency in the far-field. These simple conclusions corroborate the interpretation of the 1998 Papua New Guinea tsunami as being generated by an underwater slump.
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