Tuesday, November 20, 2007

Mapping landslides in the study reach

Here's a question to follow up on some discussion we had during Kyle's recent visit to Portland. Jim suggested that it would be useful to map large, coherent chunks of failed material (when they are clearly distinguishable) within the landslide boundaries. These would be mapped as bits of the parent lithology (e.g., West Crater flow or whatnot). The advantage of this approach is that it retains some of the information about rocktypes involved in landsliding that is surrendered when landslides are simply mapped as "Qls." My question is, how can/should we distinguish on the map between failed material and bits of in situ material that poke out within a landslide complex?

1 comment:

  1. Liz,

    Largely intact materials caught up in the landslide can be mapped with an overlying pattern (e.g. a bunch of randomly oriented triangles) whereas in situ, unfailed rock within a landslide zone will be mapped as the rock minus the pattern. I will work on an area where both things are going on and post an image for discussion...maybe tomorrow, but by Friday.


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