Microearthquakes in the Middle Butte/East Butte Area, Eastern Snake River Plain, Idaho

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Numerous compilations of instrumental and non-instrumental seismicity demonstrate that the eastern Snake River Plain (ESRP) is seismically quiet relative to surrounding block-faulted mountainous areas. Although the frequency of occurrence of ESRP microearthquakes is very low and cannot be quantified with available data, the documented existence of these events is important because they can provide valuable data for the evaluation of regional tectonic models and seismic hazards. In this paper we present evidence for microearthquake activity on the northeast-trending longitudinal axis of the ESRP, an area where detailed seismic monitoring has not been previously attempted.


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