Geophysical investigations of the Western Ohio-Indiana region: Final report, October 1981-September 1986

Technical Report · Sun Mar 01 04:00:00 EST 1987

OSTI ID:6402649

Christensen, D H; Pollack, H N; Lay, T; Schwartz, S Y

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. Five local and near-regional earthquakes have been recorded and located during the 1985-86 fiscal report period, ranging in magnitude from 0.5 to 5.0m/sub b/. The two largest of these events (January 31, 1986, near Cleveland, Ohio, magnitude = 5.0m/sub b/, and July 12, 1986, near St. Marys, Ohio, magnitude = 4.5m/sub b/) were felt with minor damage reported in each case. Focal mechanisms and isoseismal maps for these events are included in this report. These events are the largest to have occurred in Ohio since the events of March 2 and March 9, 1937 (magnitude = 4.5 and 4.9, respectively). The remaining three earthquakes of this report period all occurred in Ohio, north of the array. A total of 42 local and near-regional events, eleven of which have been felt, have now been recorded by the Ohio-Indiana array since its initiation in 1976. Teleseismic P-wave arrival and residual tables have been updated to include newly acquired data. The results are similar to those in previous years. The local velocity structure has been investigated using data acquired during a refraction experiment in the summer of 1984 and travel time data of local and near regional earthquakes.

• Research Organization: Michigan Univ., Ann Arbor (USA). Dept. of Geological Sciences; Nuclear Regulatory Commission, Washington, DC (USA). Div. of Engineering Safety
• OSTI ID: 6402649
• Report Number(s): NUREG/CR-3145-Vol.5; ON: TI87900772
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
EARTHQUAKES
FEDERAL REGION V
GEOLOGIC STRUCTURES
INDIANA
NORTH AMERICA
OHIO
SEISMIC EVENTS
SEISMICITY
USA