Seismic data and revised fault model of the Long Valley Caldera region

An innovative review of geologic data has led to a revision of potential earthquake hazards near Mammoth Lakes, CA, reducing the likely shaking hazard in the area. CalVO USGS Scientist Emeritus Dave Hill and USGS Research Geologist Emily Montgomery-Brown reviewed geological and geophysical data from the Long Valley region to better understand the potential shaking hazards posed by two large Sierra Nevada range-front normal faults in the Long Valley region. Their research indicates that neither the Hartley Springs nor Hilton Creek faults extend into the caldera.