Comparative study of precariously balanced rocks: geomorphologic setting and governing processes, geologic context, and seismotectonic setting Comparative study of precariously balanced rocks: geomorphologic setting and governing processes, geologic context, and seismotectonic setting The formation of precariously balanced rocks requires an appropriately jointed, otherwise fairly homogeneous and isotropic, rock mass (i.e., granite), lowering of the landscape at a moderate rate so that the appropriate amount of differential erosion can occur, and action of weathering processes over some time to further decrease stability. Preservation of precariously balanced rocks is modulated by earthquake-driven strong ground motion, among other things. The potential of precarious rocks as recorders of the recurrence of ground shaking at a location over millennial or longer time scales is appealing. But, testing their fidelity continues. A comprehensive understanding of the geomorphic processes and context controlling the development of precarious rocks is required. The significance of rock type and joint geometry must be further assessed. Finally, comparing the preservation (densities and types) of precarious rocks in different seismotectonic settings (manifest as seismicity rate) will help build confidence in their utility as negative indicators of previous strong ground motion.
|Effective start/end date||7/1/08 → 3/31/10|
- Southern California Earthquake Center: $29,635.00
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