Middle Fork Nooksack debris flows- another one, and an update

The Middle Fork has cut 10 m through the May 31 debris flow. Click to enlarge.

The Middle Fork has cut 10 m through the May 31 debris flow. Click to enlarge.

There is a description of ongoing dramatic changes to the new debris flow deposits in the Middle Fork Nooksack over on the MBVRC blog. There has been a second debris flow, on June 6th.

Debris flow update: http://mbvrc.wordpress.com/2013/06/12/more-debris-flows-in-middle-fork/

Comparative YouTube videos. June 9th  video shows major changes in only four days: http://www.youtube.com/watch?v=8cepN93zOY8

Compare with the June 5th YouTube video: http://www.youtube.com/watch?v=4vVJPPwLgwM

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2 Responses

  1. So this is a mini lahar?

    • Dennis,
      No, not technically. All lahars are debris flows. Not all debris flows are lahars. Lahars are spawned by volcanic activity, or involve recent volcanic deposits. The Middle Fork debris flow has many characteristics of lahars- clay rich, very sticky and thick. However, it began as a landslide in glacial deposits that happen to be on teh flank of a volcano. A debris flow like this could develop on any peak that had large moraines.
      Dave

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