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Scripps Institution of Oceanography
• Tectonics controlonshore and offshoremorphology
• How does tectonicsinfluence thickness ofsands offshore?
Scripps Institution of Oceanography
• Tectonics play arole in controllingsand thickness anddistribution
• How does tectonicsinfluence biology?
Scripps Institution of Oceanography
• Tectonic deformationcontrols habitats andbiodiversity
• Are there otherassociated hazardswith tectonics?
Slump scarSlump Block
Results from Multibeam Data
N
Slide Motion
Failure area broken into separate pistons
Each piston can move vertically, horizontallyor a combination of the two
Slide would besouth towards thebottom of thecanyon
N
Modeling Results Time
This
Corresponds to this
Maximum wave height
Tsunami Run Up & Effects
Streets that are below 5m: Camino Del Oro, Vallecitos, Avenida de la Playa, ElPaseo Grande, Paseo del Ocaso
Property value range: $275,000 – $1.37 million. Average cost: $700,000
During the summer months 17,000 people/day visit La Jolla Shores Beach
Tsunami Date Runup Source Type Region
December 21, 1812 3.4 m Earthquake/landslide Santa Barbara
7.7?
August 31, 1930 3 m Earthquake/landslide Redondo Beach
5.2 Santa Monica
Venice
October 18, 1989 1.0 m Earthquake/landslide Monterey
7.2 Moss Landing
April 25, 1992 0.9 m Earthquake Humboldt Bay region
7.2
September 1, 1994 0.1 m Earthquake Crescent City
7.0
Threat from Distant Sources: Large earthquakes of distant or local origincan cause tsunamis which can be very damaging in California. Of these,tsunamis generated from distant earthquakes pose the greatest threat forCalifornia, particularly those generated in the Aleutian Islands and Alaska.The frequency of occurrence for such events is considered relatively high.Northern California is particulary susceptible to such distantly - generatedtsunamis, while Southern California is affected to a much lesser extent.the bay.
Threat from Local Earthquakes: The relative tsunami threat for localtsunamis in California can be considered as being relatively low because ofthe low recurrence frequencies from these disasters. The recurrencefrequency of large tsunamis in California has been estimated to be once every100 years. Between 1812 and 1988, thirteen possible tsunamis have beenobserved or recorded from local earthquakes. These events were poorlydocumented and some are questionable. There is no doubt that earthquakesoccurring on submarine faults, off Santa Barbara, could generate largedestructive local tsunamis. Perhaps the size of the 1812 tsunami wasexaggerated in the historical records, but one and possibly two large tsunamisdid occur in the area.
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