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.


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

  2. doesn't show the escarpment, but interesting.

  3. Maybe try contacting the USGS office?

    Seattle, WA Field Office
    Craig Weaver
    Joan Gomberg
    206-616-5581 (office) 206-941-7498 (cell)

  4. 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).

  5. 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.

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

  7. Have you looked along the Lost River Fault?