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Stevens Canyon Land Slide, Tectonic Block?, Part 1
A return visit to the landslide area along the old section of Stevens Canyon Road.
The week before, I ventured into the depression between the canyon slope and the ridge above the landslide. I had once thought there was a creek that flowed down here and that was associated with the slide activity. But after studying the hill shade map as well as setting foot up here, I realized this looks very much like the "sag pond" depressions along the north side of Stevens Creek that the Canyon Trail follows:
https://en.wikipedia.org/wiki/Sag_pond
Paper: ENVIRONMENTAL GEOLOGIC ANALYSIS OF THE MONTEBELLO RIDGE MOUNTAIN STUDY AREA:
https://openlibrary.org/works/OL68916...
Pg. 22 mentions a landslide associated with the 1906 earthquake and this is ground zero for that slide. In fact, the report mentions that slide extended for 1/2 mile, nearly a kilometer, along the canyon.
USGS National Map Viewer w/ Hill Shade layers:
https://apps.nationalmap.gov/viewer/
More to come...
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#USGS #HillShade #geology #earthquake #tectonicplates
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