[en] The Iowa Geological Survey, in cooperation with the State Geological Surveys of Kansas, Nebraska, and Oklahoma, is making a five-year study of the Mid-continent Geophysical Anomaly and the Nemaha Uplift. The intent is to gain a better understanding of the sources and mechanisms of the earthquakes that have occurred in the region. The various studies are designed to provide information that will permit more meaningful evaluation of earthquake risk factors in the siting and design of nuclear facilities. 14 figures