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Tsunami Deposits

Tsunami Deposits. Storms vs. Tsunami Frequency/Magnitude Source? Event stratigraphy : Identifying (EQ, Landslides, Storms) Tsunami fine landward Storms coarsen landward Basinwide synchroneity Dating (multiple methods) Big Boulders (wave energy, inundation). Tsunami Deposits (cont’d).

raphael-bernard
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Tsunami Deposits

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  1. Tsunami Deposits • Storms vs. Tsunami • Frequency/Magnitude • Source? • Event stratigraphy : • Identifying (EQ, Landslides, Storms) • Tsunami fine landward • Storms coarsen landward • Basinwide synchroneity • Dating (multiple methods) • Big Boulders (wave energy, inundation)

  2. Tsunami Deposits (cont’d) • Event Geomorphology • Ebb and flow channeling • Marsh/barrier alternate models (regions without marsh) • Sediment record (deposition and erosion) • Historical/Geological correlations • Mediterranean, Japan, China, etc.

  3. Tsunami Deposits (cont’d) • Coastal Conservation (Reefs and Mangroves) • Buffers? • NGOs and conservation • Record of past events • Freshwater isotopic record in coral (most storms) • Atoll lagoon coring • Deposition/erosion of reef

  4. Seafloor Morphology • Frequency/Magnitude • dating (Scarp diffusion, Scotia Margin, Industry Data) • Magnitude power law scaling on different margins • Landslides (erosional process) • Earthquakes (energy input) • Sediment supply for landslides • Glacial margins and deltas • Sea level lowstands (slope deposition)

  5. Seafloor Morphology (cont’d) • Defining landslides • Morphology- Is it really a landslide? • Populations of varied environments • Composite vs. discrete? • Classification scheme (slide vs. slump, etc.) • US West Coast seismic and multibeam (5 or 6 PhDs work!)

  6. Seafloor Morphology (cont’d) • Onshore deposits tied with offshore events • Orphan deposits- source? • Big slides- tsunamigenic? • Examples- Grand Banks, PNG, Goleta, Lisbon (1755)? • Volcanic sector collapse • Canaries • Hawaii

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