San Francisco: Where the Plates Meet
Posted: Wed Aug 27, 2025 9:53 am
Written in 2020 but, IMHO, still relevant.
Includes lovely map showing shore-lines during glacial low-stand, when Bay was *dry*.
FWIW, I did not realise the 'Inch / Year' San Andreas fault was so geologically 'young'.
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San Francisco: Where the Plates Meet
https://blogs.egu.eu/divisions/ts/2020/ ... ment-25998
In this blog, we will read the rocks of the land surrounding San Francisco Bay, known as the Bay Area, to tell a story of active tectonism at the North American Plate margin that extends back 200 million years. A geological history that resulted in the landforms that have attracted people to the site of this great “City by the Bay”. These landforms include coasts with abundant marine and terrestrial resources, a sheltered deep-water harbor, hills and mountains with plentiful forests, and streams and rivers providing water and transportation routes, including to the goldfields of the Sierra Nevada Mountains.
Includes lovely map showing shore-lines during glacial low-stand, when Bay was *dry*.
FWIW, I did not realise the 'Inch / Year' San Andreas fault was so geologically 'young'.
--
San Francisco: Where the Plates Meet
https://blogs.egu.eu/divisions/ts/2020/ ... ment-25998
In this blog, we will read the rocks of the land surrounding San Francisco Bay, known as the Bay Area, to tell a story of active tectonism at the North American Plate margin that extends back 200 million years. A geological history that resulted in the landforms that have attracted people to the site of this great “City by the Bay”. These landforms include coasts with abundant marine and terrestrial resources, a sheltered deep-water harbor, hills and mountains with plentiful forests, and streams and rivers providing water and transportation routes, including to the goldfields of the Sierra Nevada Mountains.