GOPH 375 Lecture Notes - Water Mass, Hypocenter, Submarine Landslide
Document Summary
Seismic risk = vulnerability x seismic hazard. Vulnerability increases with lots of population, tall buildings, highways etc. Cnsn: canadian national seismograph network monitors eq activity: eq"s trigger two rapid responses (within minutes): automated natural hazard alert. System (anhas-alerts railways/utility companies, etc) and shake maps (representation of the ground shaking during an eq) Seismic zonation: building codes to be eq resistant building materials that don"t cause resonance. Resonance: overlap between seismic wave"s natural frequencies and foundation buildings/materials. Your building resonance shouldn"t match the ground materials (earthquake frequencies at all) Bc has a large hazard for mega-thrust eq. Figure 5. 13/5. 17 (salt water killed the trees) Intraplate earthquakes: not on plate boundaries, inside continent. Continents are rifted, drifted and reassembled in different patterns. Sometimes rifting process stops before separating a continent, leaving weak spots in continents and failed rifts. 5. 20 (quebec along the st lawrence valley river) this is along an old plate rift.
