Logs for interpretation practiceThings to record for each log:1) Interpretation of geomorphic setting of

sedimentation overall2) Each piece of evidence for an earthquake:

-location-type of evidence-quality (poor, fair, good)

3) Number of earthquakes and the quality of each4) Speculation about paleoslip/magnitude

Photo of the North Frontal thrust fault exposed in a trench through young alluvium. The 1.7 m dip-slip offset of a carbonate paleosol horizon is readily visible. This offset must postdate the age of detrital charcoal retreived from the hanging-wall one meter left of the tape measure, which we have dated with radiocarbon as 9.7 Ka. This demonstrates Holocene activity along the North Frontal thrust system.

http://www.esp.geos.vt.edu/spotila/js-nfts.html

http://www.geology.cwu.edu/facstaff/charlier/currentprojects/los_angeles_sum.html

T4 NW WallSW NE

0 1 m

Scharer, et al., 2007

Scharer, et al., 2007

Scharer, et al., 2007