A glimpse of earthquake fracture mechanics

A small group of rotary shear friction investigators in earthquake physics (from the U.S., Italy, Japan, and China) had a collaborative meeting earlier last week, and I was luck enough to be a part of it. We openly exchanged ideas, and comments on where the community stands and what directions might be taken. Lots of good science and discussions. A lot of the discussions there were probably proprietary, so I won’t go into details. But, I was given permission to share this one:

In the meeting, Giulio Di Toro (one of the principal investigators in Italy) showed a video that needs to be seen — disintegrating marble (it’s as wicked as it sounds!). We (the University of Oklahoma group) have done this in dolomite, but we didn’t have high-speed footage.

The video is of Carrara marble, undergoing high-speed shearing (7 m/s) as recorded by a high-speed camera (4000 fps). The whole event, in real time, took place in less than 0.2 seconds.

UPDATE: For more rock mechanics fun. Check out my other post on the same machine, using different parameters, How To Make Homemade Lava.

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~ by Jefferson C. Chang on 19 February 2012.

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