File:San Francisco City Hall (16467494333).jpg
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Summary
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San Francisco City Hall — For our #TBT we're sharing a photo from San Francisco City Hall after the Great San Francisco Earthquake on April 18, 1906 (9 days from now...and, of course, almost 109 years earlier). After the earthquake and fires, the building was reconstructed with a new design and slightly smaller footprint. After the 1989 Loma Prieta earthquake the building was retrofitted with a seismic base isolation system which essentially helps separate the main building from the substructure below it, using flexible rubber bearings or pads, in order to absorb much of the shaking from an earthquake rather than that motion moving upwards into the building itself. This doesn't make the building "earthquake proof" but it can significantly lower the amount of damage.
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| Source | San Francisco City Hall |
| Author | U.S. Geological Survey from Reston, VA, USA |
Licensing
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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This image was originally posted to Flickr by U.S. Geological Survey at https://flickr.com/photos/27784370@N05/16467494333 (archive). It was reviewed on 19 January 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero. |
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 21:00, 19 January 2018 | | 2,187 × 1,797 (540 KB) | Artix Kreiger 2 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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