Deformation of human structures on the Calaveras fault part 3.
1) I'm cheating, can't believe I missed it. The path in front of the house pictured in #googleearth
street view should be centered on the stairs, but the yard is shifting right where the path meets the steps.
2) in some areas the fault movement is distributed across a wider area, mostly because the fault bends and changes directions slightly.
3) en echelon cracks forming in the road since it was repaved, not sure when. En echelon cracks are usually present at the initial start of fault propagation, and consist of a series of parallel to sub parallel fractures that merge together with progressive shear.
4) offset sidewalk....this was stamped as being laid in 1910. So the offset should be the total movement since then right? WRONG. The slip is distributed over a wider area here on this street as in photo 2.
5 & 6) compare these two pictures. The second (6) was taken 6 months before mine (5). In that time frame, the walkway to the home has started buckling upwards. I spoke to the homeowner because she thought I was with the city inspectors, and was concerned about getting a fine (because kalifornia). After I assured her I was just a paisano from the old neighborhood and to fuhgettabahtit, she told me the house has been in her family for 100 years. If you place a ball on the floor on one side of the home, it rolls east, and on the other, west.
7) these points and the previous ones I have in my feed are mapped out where I observed them.
Am I making you hot yet? Its okay you can tell me I'll keep it a secret (#geologyporn
The Calaveras fault is an active branch of the San Andreas fault, with 3 seismically distinct sections. The southern portion is undergoing "aseismic creep" or in other words it is moving very slowly, rather than large jogs during bigger earthquakes. The City is Hollister, CA.
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