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Another John Lahr exhibition item. The elastic
rope (simulated strain) is pulled by the far crank, until it overcomes
the brick sliding resistance. There is a geophone on the table connected
to a DataQ connection and connected to the laptop computer, which displays
the "quake". This was a popular "interactive", exhibit item.
The geophone used, is just this side of the lap top, and is set on a piece
of wood and glued down. Yes....I forgot to check the geophone frequency....
990521-008c
Another fine poster by Edward Cranswick (top), with regard
to the Pymatuning earthquake in Pennsylvania. Their is many posters
involving other areas and subjects throughout the building. Edward
also gave out a number of large wall posters depicting earthquake activity
world wide and several U.S. maps and two publications....very fine quality....thanks
Edward!
990521-009c
Another view of John Lahr's shake table.
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Another view of John Lahr's shake table. Note on
the photo the leaning buildings bottom, and on the top photo, what appears
to be a displaced front staircase.
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Another view of John Lahr's shake table.
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This original photo was far to dark, it has been changed
to bring out the faces...the colors are not accurate. On the left
is Dave Wolny of Grand Junction, Colorado. On the right is Edward
Cranswick of USGS, Golden, Colorado.