Geophysical investigations of the western Ohio-Indiana region

Technical Report · Wed Jan 31 23:00:00 EST 1990

OSTI ID:7023779

Young, C J; Lay, T; Jacobson, J ^[1]

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1. Michigan Univ., Ann Arbor, MI (USA). Dept. of Geological Sciences

Earthquake activity in the Western Ohio-Indiana region has been monitored with a precision seismograph network consisting of nine stations located in west-central Ohio and four stations located in Indiana. Three local earthquakes have been recorded during this report period, with magnitudes ranging from 0.7 to 2.2. This may represent a return to a more normal local level of seismicity after an anomalously low level in the two years following the occurrence of the m{sub b} = 4.5 earthquake, in St. Marys, Ohio on July 12, 1986. If the quiescent period reflected a release of most of the accumulated crustal strain by the St. Marys event, then the increased level of seismicity may mark the beginning of a new phase of strain accumulation. Four regional events were also well recorded by the array stations during this year. All of these events occurred in regions with well established histories of seismicity. Their magnitudes range from 3.1 to 4.4. 7 refs., 11 figs., 3 tabs.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (USA). Div. of Engineering; Michigan Univ., Ann Arbor, MI (USA). Dept. of Geological Sciences
• Sponsoring Organization: NRC
• OSTI ID: 7023779
• Report Number(s): NUREG/CR-3145-Vol.8; ON: TI90007274
• Country of Publication: United States
• Language: English

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