EARTHSC 2GG3 Chapter Notes - Chapter 3: Storegga Slide, Base Isolation, Krakatoa
1 Oct 2016
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Land use planning and building codes best defence and should be enforced! Zoning - should limit buildings at faults/landslide zones or hazardous environments: tsunamis. Generated by eqs or sudden displacement of water by volcanoes, etc. At subduction zone, overlying plate will bulge. Waves move in both directions from where they are generated. 1) sea floor snaps up, water pushed, 2) sea surface drops and forms trough. Resurges to form crests, 3) gravity restores it to eqm. position, waves in both directions. Biggest risk to eq generated tsunami: washington, alaska, bc, etc. Once a decade = major tsunami, 30 m high wave = once every 20 years. Poorly understood, max size unknown (montserrat island: volcanic ash into ocean. Landslides or rock avalanches can also cause them (height of fall more important than weight of material) Submarine landslides: can generate tsunamis too storegga slide collapsed a continental shelf off norway.
