Valerie Zimmer, you wrote,
> I am a grad student who is
> looking into recording wave signatures from (and hopefully preceding)
> landslide events, in particular, rockfalls in Yosemite National Park.
In January of this year I recorded Yosemite icefalls at Bridalveil
Fall and Upper Yosemite Fall, and rockfalls at Middle Brother. My
intention, at the suggestion of Resources Chief Joe Meyer, was to
gather materials for a tutorial collection that would help people
analyzing soundscape recordings to distinguish between the two.
In just a few hours I was able to collect enough examples to be able
to show significant differences. The impacts of small rockfalls, a
billiard-ball-like clatter, were about an octave higher than those of
icefalls. Whereas the icefalls shattered, followed by at most a swish,
rockfalls had a tail of talus sliding.
I'd be happy to share my material with you. I plan to go back for more
of the same this coming January.
-Dan Dugan
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