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Thursday, July 7, 2016

Things You Can't Easily Find on the Internet

The 1983 Mount Borah earthquake apparently produced a substantial escarpment.  While I  can find pictures of it, I can't find a location for it.  (I am in Salmon at the moment.)

UPDATE: South on US 93 of Challis, on the road to Mackay.  Okay, I cheated.  I  plugged in the latitude and longitude from that USGS webpage into the Jaguar's navigation.  It wants degrees, minutes, seconds, but I was able to convert decimal degrees into minutes and seconds with enough accuracy in my head to narrow it down to where I found signs.  (One minute of latitude is a bit more than a mile.)  Coming soon: The Borah Peak Earthquake Escarpment: Geology and Botany.  Rhonda took lots of nice pictures.

The road the escarpment is on US 93 29 miles south of Challis.
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7 comments:

  1. rogue14July 7, 2016 at 9:09 AM

    I found this. Not sure if it's what you're after or not though...

    http://earthquake.usgs.gov/earthquakes/states/events/1983_10_28_iso.php

    ReplyDelete
  2. Clayton CramerJuly 7, 2016 at 9:25 AM

    doesn't show the escarpment, but interesting.

    ReplyDelete
  3. rogue14July 7, 2016 at 9:28 AM

    Maybe try contacting the USGS office?

    Seattle, WA Field Office
    Craig Weaver
    Joan Gomberg
    gomberg@usgs.gov
    206-616-5581 (office) 206-941-7498 (cell)

    ReplyDelete
  4. Allen CogbillJuly 7, 2016 at 9:37 AM

    The first page of this paper by Wallace shows the location of an observed scarp on a map. I think you can get the location off this map (it appears to be a line drawing from a USGS topo map).

    http://www.bssaonline.org/content/74/3/1091.extract

    ReplyDelete
  5. Allen CogbillJuly 7, 2016 at 10:11 AM

    An addendum to my previous comment:

    The location of the fault scarp in the Wallace paper is 44°14'25" N., 113°53'50" W. The location is on the Dickey Peak USGS quad (the Dickey Peak quad is immediately west of the Borah Peak quad).

    Note also that I think multiple surface scarps were created, so the photo you mention may not be the photo of the same surface scarp in the paper.

    ReplyDelete
  6. FidelJuly 7, 2016 at 2:21 PM

    Well, this looks pretty much like an escarpment on the SW side of Borah Pk:


    https://www.google.ca/maps/place/44%C2%B007'09.9%22N+113%C2%B048'44.6%22W/@44.1194178,-113.8145707,551m/data=!3m2!1e3!4b1!4m5!3m4!1s0x0:0x0!8m2!3d44.119414!4d-113.812382

    ReplyDelete
  7. MinicaptJuly 7, 2016 at 3:43 PM

    Have you looked along the Lost River Fault?

    Cheers

    ReplyDelete