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La Jolla, San DiegoLa Jolla, San Diego
Small faults in San Diego & La Jolla yellow -> gen. fault trend red -> small faults
Mt. Soledad formed by tectonic uplift
N
La Jolla and Scripps CanyonLa Jolla and Scripps Canyon
Submarine canyon
Proximal to LJ Shores and SIO
Associated w/ regional faults
Terraces along N&S faces of
Scripps Canyon
Scripps Canyon
LJ Canyon
Bathymetry of Scripps Bathymetry of Scripps CanyonCanyon
Bulletin of the Geological Society of America 60:1597-1612, 1949
SeismicsSeismics
Examination of sub-Examination of sub-bottom structurebottom structure
Origin of terraces and Origin of terraces and associated blocksassociated blocks
Explain asymmetric Explain asymmetric profile canyonprofile canyon
Seismic SurveyingSeismic SurveyingKennedy, 1980
R/V Ellen B. Scripps in 1977 and R/V Polaris in 1970
Yield:
2,000 km medium and high resolution sub-bottom reflection profiles
Portions used marked in red
Concepts of Ward’s Tsunami Concepts of Ward’s Tsunami ModelModel
Determine perturbation of sea floor shape and project Determine perturbation of sea floor shape and project perturbation onto sea surface over time and spaceperturbation onto sea surface over time and space
Classical Tsunami Theory:
Rigid sea floor
Sea water is “incompressible, homogenous, and non-viscous”
Linear wave theory:
Ratio of a wave’s amplitude to wavelength much less than 1
Allows modeling of complex events through the superposition of simpler ones
Slide MotionSlide Motion
Failure area broken into separate pistons
Each piston can move vertically, horizontally or a combination of the two
Slide would be south towards the bottom of the canyon
N
Tsunami Run Up & EffectsTsunami Run Up & Effects
Streets that are below 5m: Camino Del Oro, Vallecitos, Avenida de la Playa, El Paseo 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