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Map shows the potential thickness of tephra on the ground from future eruptions in the Long Valley area that eject less than 1 km3 magma. Downwind deposits of ash produced by an explosive eruption could reach thicknesses of at least 20 cm at a distance of 35 km (8 in. at 22 mi), 5 cm at a distance of 85 km (2 in. at 53 mi), and about 1 cm at a distance of 300 km (0.5 in. at 185 mi). These estimates of potential ash thicknesses are based on deposits of ash from past eruptions at other volcanoes that involved volumes of as much as 1 km3. Only a part of an ash-fall hazard zone would probably be affected by any single ash fall; the part affected would be determined by the wind speed and direction or directions during an eruption. |
Miller, C.D., Mullineaux, D.R., Crandell, D.R., and Bailey, R.A., 1982, Potential hazards from future volcanic eruptions in the Long Valley-Mono Lake area, East-Central California and Southwest Nevada -- a preliminary assessment: U.S. Geological Survey Circular 877, 10 p.
Miller, C.D., 1989, Potential hazards from future volcanic eruptions in California: U.S. Geological Survey Bulletin 1847, 17 p.