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Fault exposed in a trench on Pajarito Mesa, in the central part of the Los Alamos National Laboratory. The white layer is an early Pleistocene volcanic ash that is offset 37 cm down-to-the-west along a north-south trending fault. This fault last ruptured more than 50-60,000 years ago. The Laboratory is located adjacent to an active boundary of the Rio Grande rift, the Pajarito fault system, and many faults of this scale and larger occur in the area. This trench was excavated as part of paleoseismic investigations associated with planning for a potential Mixed Waste Disposal Facility. |
