This report presents the results of a paleoseismic investigation designed to date a long series of consecutive earthquakes on the Wasatch fault zone and to measure the variability of recurrence times between the events. Geologists have long recognized that the comparatively short average recurrence interval (compared to most other basin-and-range normal faults) between large surface-faulting earthquakes on the Salt Lake City segment of the Wasatch fault zone during mid- to late-Holocene time is potentially anomalous, and possibly affected by the rise and fall of Lake Bonneville. This study extends the paleoearthquake record back to Bonneville time, nearly doubling the previous record, and provides new information on the timing and periodicity of surface faulting on the Salt Lake City segment from the latest Pleistocene through the Holocene. The trench and accompanying auger hole for this study exposed 26 meters of vertical section, roughly four times that of a typical paleoseismic trench on the Wasatch fault zone, hence the name “Megatrench.”
This report presents the results of a paleoseismic investigation designed to date a long series of consecutive earthquakes on the Wasatch fault zone and to measure the variability of recurrence times between the events. Geologists have long recognized that the comparatively short average recurrence interval (compared to most other basin-and-range normal faults) between large surface-faulting earthquakes on the Salt Lake City segment of the Wasatch fault zone during mid- to late-Holocene time is potentially anomalous, and possibly affected by the rise and fall of Lake Bonneville. This study extends the paleoearthquake record back to Bonneville time, nearly doubling the previous record, and provides new information on the timing and periodicity of surface faulting on the Salt Lake City segment from the latest Pleistocene through the Holocene. The trench and accompanying auger hole for this study exposed 26 meters of vertical section, roughly four times that of a typical paleoseismic trench on the Wasatch fault zone, hence the name “Megatrench.”
Interdisciplinary study on the role of earthquakes in the eastern Mediterranean. Does the "Minoan myth" still stand up to scientific scrutiny? Since the work of Sir Arthur Evans at Knossos (Crete, Greece), the romanticized vision of the Cretan Bronze Age as an era of peaceful prosperity only interrupted by the catastrophic effects of natural disasters has captured the popular and scientific imagination. Its impact on the development of archaeology, archaeoseismology, and earthquake geology in the eastern Mediterranean is considerable. Yet, in spite of more than a century of archaeological explorations on the island of Crete, researchers still do not have a clear understanding of the effects of earthquakes on Minoan society. This volume, gathering the contributions of Minoan archaeologists, geologists, seismologists, palaeoseismologists, geophysicists, architects, and engineers, provides an up-to-date interdisciplinary appraisal of the role of earthquakes in Minoan society and in Minoan archaeology - what we know, what are the remaining issues, and where we need to go.
This report presents the results of a preliminary evaluation of the East Bear Lake (EBF) and West Bear Lake (WBF) fault zones, which bound the east and west sides, respectively, of the Bear Lake Valley. The Bear Lake Valley straddles the Utah/Idaho border northeast of Logan, Utah. The results of this study show that both the EBF and the WBF have experienced surface-faulting earthquakes in the recent geologic past and therefore represent an ongoing seismic hazard to northeastern Utah and southeastern Idaho.
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