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These layers of pumice and ash were formed by explosive eruptions that occurred 500 to 1,200 years ago along the Mono-Inyo Craters volcanic chain. The layers were deposited over broad areas downwind from several vents. By carefully recording the location, thickness, and characteristics of hundreds of rock layers like these, and determining their ages, scientists have determined the type and frequency of past eruptions along the Mono-Inyo Craters volcanic chain (for example, see this simplified illustration of eruptions in the past 5,000 years). Based on this record of relatively recent eruptions, volcano-hazard zones in the Long Valley area have been identified that show areas likely to be affected by future eruptions. |
