Originate in settings where there is a relative sea level fall - where land surface is rising at a faster rate than sea level is rising. West Cliff Drive,

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Presentation transcript:

Originate in settings where there is a relative sea level fall - where land surface is rising at a faster rate than sea level is rising. West Cliff Drive, Santa Cruz, CA Sea Cliffs and Fronting Wave Cut Platform

Sea Cliff Retreat – Processes and Timing 1.Abrasion of a Basal Notch 2.Thresholded Failure 3.Comminution Lag - Protective Feedback Episodic Sea Cliff Failure Retreat History Figure from Hapke and Richmond, 2002, Marine Geology

grain entrainment - abrasion - positive feedback beach development - wave energy dissipation - negative feedback Sea Cliff Erosion – feedbacks*

after: Ruggiero et al., 2001 What about influence of lithology? Correlation of Wave Runup and Sea Cliff Retreat

Tectonically Active Margin: Santa Cruz Mountains and SF Peninsula Image courtesy of USGS / PG&E Cooperative Research

Monterey Canyon - tectonic offset Figure from Greene et al., 1991

Highway 1 near Santa Cruz, California Erosional Geomorphic Features - Marine Terraces Note sharp edges of the modern (actively forming) sea cliffs and diffuse, scraps of terrace treads high in the landscape

Correspondence of Terrace Elevation with Age/SL highstand From Merritts and Bull, 1989, Geology

Marine Terrace Generation and Degradation* Animation by Robert S. Anderson:

Isostatic Uplift and Landform Preservation Holocene Beach Ridges - Sweden - isostatic uplift from deglaciation since late Pleistocene = 2mm/yr

Isostatic Uplift of the Florida Platform

Karstostasy - Idealized Animation by Peter N. Adams:

Karstostasy – Application to Florida Through the Pleistocene Animation by Peter N. Adams: