1. Could It Happen Here? The prospect of a tsunami in the north west Joshua Alcantara Maria Dougherty

2. Outline History of Previous Tsunamis. What causes a tsunami? Types of Tsunamis Why Southern California? Other information: –Economic effect of a Tsunami.

3. Area of possible tsunami in California

4. History Southern California has been free of damaging earthquakes for the past 200 years. However, moderate earthquakes have been increasing recently Unusual damaging waves have gather considerable attention. Papua New Guinea July 17, 1998 Also several locally generated tsunamis have been recorded. Santa Barbara December 1812 generated a tsunami effecting 60km (37.28 miles) of the coast.

5. What Causes a Tsunami? Earthquakes with magnitudes less than 7.0 have been known to cause tsunamis. Scientists hypothesis potential tsunamis in southern California may be caused by submarine landslides, or slope failure. Two basic types of submarine landslides. –Rupture Surface. (More likely to happen in California) –Displaced Mass of Material.

6. Rotational Slump Rupture surface cuts through a homogenous material Scoop shaped, concave upward Slope follows a circular arc.

7. Translational Slide Rupture surface is planar Failure result of a heterogeneous material –Bedding planes

8. http:// www.geocities.co.jp/SilkRoad-Ocean/4668/gallery/gallery.html

10. Why California? Slopes offshore of Southern California have thick accumulations of under-consolidated sediment. Studies have shown significant sliding and slumping recently. especially in the Santa Barbra Channel. Therefore underwater slope failures are easily triggered by seismic activity due to the low shear strength of the sediments possibly giving give rise to a 20m tsunami. The deep basins, towering ranges, and canyons with steep walls that make up the southern California landscape can become immensely flooded

15. Calculating the cost of an inundation in Southern California caused by a tsunami Southern California Planning Model: a holistic approach to tsunami effects –A model that incorporates the economic loss through loss of labor, transportation, services SPCM 1 –Trip matrices SPCM 2 –The model calculates direct losses within a damage area and the economic effects of theses losses. –Transportation effects –Versus just calculating damage cost »ie replacing damaged or destroyed property.

16. Direct losses arise from lost opportunities to produce or, in the case of port damage, to ship. Indirect and induced losses arise as people and businesses in the damaged areas become unable to work or generate income as a result of the event. –Indirect losses are incurred by suppliers whose products and services are no longer purchased by damaged firms and households. –Induced losses are losses due to labor.