Lecture 6 Normal faults 2. Normal faults Tectonic environments (5) Landscapes (6) Coseismic structures and patterns (6) –Case history from Nevada, 1954.

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Presentation transcript:

Lecture 6 Normal faults 2

Normal faults Tectonic environments (5) Landscapes (6) Coseismic structures and patterns (6) –Case history from Nevada, 1954 –Case history from Idaho, 1983

from MacQuarrie and Wernicke (2005)

Some landforms: Triangular facets, alluvial aprons, wineglass canyons, and turtlebacks

Fault ribbons, alluvial aprons and triangular facets

Triangular facets, wine-glass canyons, and slumps

Turtlebacks

Sparta

Mani

A “brick” (or two) The “Building” Mani peninsula, Greece

Mycenae

Orem Ephesus

Faulting versus dike intrusion in the Mono Basin, eastern California

Calculation of slip rates ~25m/15,000 years McGee Creek, eastern Sierra Nevada

A Case History: Ruptures of the Dixie Valley and Fairview Peak earthquakes, 1954

Historical ruptures in the Central Nevada Seismic Zone Irregularity of fault plane in direction perpendicular to slip vector

Stillwater rangefront

A Case History: Rupture of the Lost River Range fault during the Borah Peak earthquake, Idaho, 1983

Geometry of the fault rupture

A detail of the rupture

Coseismic slip function

Vertical coseismic deformation

Coseismic vertical deformation profile Aftershock cross-section Geologic cross-section