Figure 1. Here are three schematic drawings of survey markers at three different times. (a) Survey I (1852) would show markers (fixed points on the ground) in a straight line across the fault. (b) Survey II (1892) found a displacement of the survey markers and a distortion of the survey line. (c) Survey three (1906), after the San Francisco earthquake, found the markers to be displaced (to the north on the west side of the fault), but the survey line was no longer distorted. [Credit: Glenn Dolphin]
Originally uploaded in NAGT:Our Resources:In the Trenches:2018 - Volume 8:In The Trenches - January 2018.
Image 175278 is a 332 by 975 pixel WebP
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Jan10 18
