SD RECOGNIZES THAT THE NUREG REPORTS REPRESENT ONLY A PORTION OF A FIVE YEAR PROGRAM. NONTHELESS, THEY SHOULD PROVIDE USEFUL INPUT
TECTONIC PROVINCE OR SEISMIC ZONING MAPS OF THE EASTERN UNITED STATES.
FOR NRC STANDARDS DEVELOPMENT PARTICULARLY IN REGARD TO A POSSIBLE REVISION OF APPENDIX A TO CFR PART 100, AND THE DEVELOPMENT OF

RIL TITLE REGIONAL TECTONICS AND SEISMICITY OF E. NEBRASKA ANNUAL RPT.

THE PURPOSE OF THIS RESEARCH IS TO STUDY THE EARTH SCIENCE PARAMETERS OF THE NEMAHA UPLIFT AND THE MIDCONTINENT GRAVITY ANOMALY. KNOWLEDGE OF THESE GEOLOGICAL STRUCTURES IS NEEDED TO DETERMINE WHETHER OR NOT THEY ARE LOCALIZERS OF EARTHQUAKES. THE INFORMATION GAINED IS OF IMPORTANCE IN THE SITING AND LICENSING OF NUCLEAR POWER PLANTS.

THIS INTERIM REPORT PRESENTS AND INTERPRETS INFORMATION OBTAINED BETHEEN JUNE 1, 1977 TO MAY 30, 1978.

THE PURPOSE OF THIS RESEARCH IN THE CENTRAL STABLE REGION IS AN ATTEMPT TO DETERMINE THE REASONS FOR, AND SOURCE OF, LARGER EARTHQUAKES IN THE EASTERN UNITED STATES. THIS NEBRASKA EFFORT CONSTITUTES A PORTION OF A COOPERATIVE GEOLOGIC, SEISMIC, AND GEOPHYSICAL EFFORT OF THE STATE GEOLOGICAL SURVEYS OF OKLAHOMA, KANSAS, NEBRASKA, IOWA, AND MINNESOTA TO STUDY THE EARTH SCIENCE PARAMETERS OF THE NEMAHA UPLIFT AND THE MIDCONTINENT GRAVITY ANOMALY. THIS REPORT (NUREG/CR-0876) PRIMARILY ADDRESSES THE GEOLOGY, STRUCTURE, TECTONICS, AND SEISMICITY OF SOUTHEASTERN NEBRASKA IN THE VICINITY OF THE HUMBOLDT FAULT ZONE (A GEOLOGIC STRUCTURE NEAR THE NEMAHA UPLIFT). THIS NEBRASKA RESEARCH PROGRAM, IN CONJUNCTION WITH OTHER REGIONAL EFFORTS, IS TO SERVE AS AN AID TO THE NRC IN DEVELOPING A RATIONAL EVALUATION OF EARTHQUAKE RISK AS IT APPLIES TO THE SITING, DESIGN AND REEVALUATION OF NUCLEAR FACILITIES LOCATED WITHIN THE STUDY REGION.

NUREG/CR-0876 CONSTITUTES ONLY A PORTION OF A MAJOR REGIONAL EFFORT DIRECTED TOWARD DETERMINATION OF THE SOURCES OF SEISMICITY IN
THE MIDCONTINENT AREA IN THE VICINITY OF THE MIDCONTINENT GRAVITY ANOMALY AND THE NEMAHA UPLIFT. THIS HUREG, COMBINED WITH THE
OTHER RESEARCH REPORTS, HAS THE POTENTIAL FOR HELPING TO RESOLVE ONE OF THE MAJOR QUESTIONS PERPETUALLY CONFRONTING THE NUCLEAR
REGULATORY COMMISSION WHEN ASSESSING NUCLEAR POWER PLANT APPLICATIONS IN THE MIDCONTINENT AREA NAMELY, WHAT IS THE SOURCE (OR
MOST LIKELY SOURCE) OF SEISMICITY OCCURRING IN THE VICINITY OF THE NEMAHA UPLIFT AND MIDCONTINENT GRAVITY ANOMALY. SINCE THIS
REGIONAL STUDY IS QUITE COMPREHENSIVE, PERIPHERAL STUDIES, APPARENTLY NOT DIRECTLY-RELATED TO EITHER THE NEMAHA UPLIFT OR THE
MIDCONTINENT GRAVITY ANOMALY, HAVE BEEN CONDUCTED. IN THE CASE OF THIS NUREG, THE REPORT ENTITLED 'RELATION OF EARTHQUAKE
EPICENTERS TO GLACIATION, IS SOMEWHAT PERIPHERAL TO THE MAIN PURPOSE OF THE OVERALL RESEARCH EFFORT BUT DOES ADDRESS A GENERIC
ISSUE OF SOME RELEVANCE.

RIL TITLE: NEW ENGLAND SEISMOTECTONIC STUDY ACTIVITIES FY77 & 78 SPONSORING OFFICE(S): NRR, SD

THE NEW ENGLAND SEISMOTECTONIC STUDY IS A 5-YEAR PROGRAM TO STUDY THE GEOLOGY AND SEISMICITY OF NEW ENGLAND AND CONTIGUOUS AREAS TO
ASSESS THE POTENTIAL SEISMIC HAZARD TO PROSPECTIVE NUCLEAR POWER PLANT SITES IN THE REGION. PRELIMINARY RESULTS THUS FAR DOCUMENT
THE PROMINENCE OF FAULTING IN THE REGION AND DEMONSTRATE THE EFFECTIVENESS OF REMOTE-SENSING, MAGNETIC-LINEAMENT AND
GRAVITY-LINEAMENT ANALYSES TO REVEAL FAULTS IN THE REGION. THE REPORTS FORWARDED WITH RIL DESCRIBE THE STUDY FROM JULY 1, 1977
TO JUNE 30, 1978.

RES RECOMMENDS THAT THE INFORMATION CONTAINED IN NUREG/CR-0081 AND NUREG/CR-0930 BE CONSIDERED BY SD AND NRR AS INPUT TO THE DEVELOPMENT OF A TECTONIC PROVINCE OR SEISMIC ZONING MAP OF THE EASTERN U.S. AND TO PROVIDE A BASIS AND GUIDE FOR ONGOING STUDIES IN THE AREA.

REGION IN ACCORDANCE WITH NRC REGULATIONS. THE STUDY IS A COOPERATIVE EFFORT AMONG FEDERAL AGENCIES, UNIVERSITIES, AND STATE GEOLOGICAL SURVEYS IN A PROGRAM TO STUDY THE GEOLOGY AND SEISMOLOGY OF NEW ENGLAND, WITH THE INTENT TO PROVIDE A STRONG BASIS FOR THE ASSESSMENT OF THE SEISMIC HAZARD IN THE YEAR PROGRAM. THE RESULTS HAVE ADDED GREATLY TO THE GENERAL KNOWLEDGE OF THE STAFF. THE SUBJECT NUREG'S ARE A SUMMARY OF THE RESULTS OF THE FIRST 2 YEARS ACTIVITY OF A 5

*** NRR : IMPACT OF RESULTS ***

THE RESULTS HAVE THUS FAR HAD NO DIRECT IMPACT ON LICENSING DECISIONS. THEY TEND, HOWEVER, TO CONFIRM PAST CONCLUSIONS THAT
PAST SEVERAL HUNDRED YEARS; AND THERE IS NO DEMONSTRATABLE CORRELATION BETWEEN SEISMICITY AND MAPPED FAULTS.
CURRENT SEISMICITY, DETECTED BY INSTRUMENTS, IS CONCENTRATED IN THE SAME GENERAL AREAS AS HISTORIC EARTHQUAKES RECORDED DURING THE

*** NRR COMMENTS AND REMARKS ***

TECHNIQUES. AN ADDITIONAL BENEFIT OF THIS PROGRAM IS THAT IT HAS DEMONSTRATED THE EFFECTIVENESS OF IDENTIFYING FAULTS USING REMOTE SENSING ION OF A SEISMOTECTONIC MAP AND TO PROVIDE A BASIS AND GUIDE FOR ONGOING STUDIES. IT IS RECOMMENDED THAT THE INFORMATION CONTAINED IN MUREG/CR-0939 AND NUREG/CR-0081 BE USED AS INPUT TO THE CONSTRUCT