Talk:1857 Fort Tejon earthquake

A fact from 1857 Fort Tejon earthquake appeared on Wikipedia's Main Page in the Did you know column on 10 May 2012 (check views). The text of the entry was as follows: Did you know... that four of the twentieth-century Parkfield earthquakes had similar intensities to the dawn foreshock of the great 1857 Fort Tejon earthquake? A record of the entry may be seen at Wikipedia:Recent additions/2012/May. The nomination discussion and review may be seen at Template:Did you know nominations/1857 Fort Tejon earthquake.

A fact from this article was featured on Wikipedia's Main Page in the On this day section on January 9, 2013, January 9, 2015, January 9, 2017, January 9, 2019, January 9, 2020, January 9, 2022, and January 9, 2023.

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Little-known quake is remembered By ALICIA CHANG, AP Science Writer. ^BlankVerse 01:25, 9 January 2007 (UTC)[reply]

During several automated bot runs the following external link was found to be unavailable. Please check if the link is in fact down and fix or remove it in that case!

• http://quake.wr.usgs.gov/research/parkfield/history/1857.html
  • In 1857 Fort Tejon earthquake on 2011-05-25 02:06:50, 404 Not Found
  • In 1857 Fort Tejon earthquake on 2011-06-01 23:02:12, 404 Not Found

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Tried to fix it. Put in a new link. Not sure if this is the correct fix. Sincerely,

talk) 02:17, 2 June 2011 (UTC)[reply

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The minimap would suggest it's in san luis obispo, but other sources say it was east of there — Preceding unsigned comment added by 207.62.170.213 (talk) 14:29, 15 October 2013 (UTC)[reply]

surface faulting along a "mole track" How is the reader to visualize a "mole track" caused by faulting?--Wetman (talk) 04:38, 9 January 2015 (UTC)[reply]

I have other concerns about this article. It is lacking focus and organization; it was written when I had less experience writing earthquake articles. Dawnseeker2000 05:53, 9 January 2015 (UTC)[reply]

I've looked up several papers that refer to "mole tracks", structures that typically form in surface ruptures during earthquakes along strike-slip faults through recent sediments. What I lack so far is a good definition. I'll keep looking and then see what I can do to tweak the article. Mikenorton (talk) 17:24, 9 January 2015 (UTC)[reply]

Here at least is a nice image File:Fault trace geq00014.jpg of a mole track in the surface rupture sense and here in contrast is a track left by a mole, so it's not difficult to see where the term came from. It appears to have first been used in the USGS report on The Parkfield-Cholame California, Earthquakes of June-August 1966 "Pressure ridges and raised wedges of soil are evidence of local compressional effects within the fracture zone. For about a mile south of locality F23, these features are so abundant that the fracture zone, when viewed from a few hundred feet away, resembles a low raised welt or mole track several inches high". Rick Sibson in 2003 said " In alluvium, strike-slip rupture zones typically comprise a “mole-track” array of en echelon primary Riedel shears with linking compressional rolls and minor thrusts." Now all I have to do is to come up with some appropriate text. Mikenorton (talk) 18:34, 9 January 2015 (UTC)[reply]

I've added an explanation using the quote from Rick Sibson - however that comes with its own technical terms I'm afraid. Mikenorton (talk) 20:35, 10 January 2015 (UTC)[reply]

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