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1977-89 earthquake epicenters 2.1 or greater 770-m-deep borehole additional earthquakes amplitudes from TUL Anadarko basin approximately 50 earthquakes Arkoma-Ouachita Region borehole seismometer Canadian County Choctaw city location daily seismograms Docekal earthquake in Oklahoma Earthquake Information Service earthquakes were located earthquakes were reported frontal fault zone Geotech S-13 greater earthquakes improved earthquake detection indicates a fault known Oklahoma earthquake located in Oklahoma Luza and Lawson magnetic field magnetometer magnitude 2.1 Meers fault Nemaha uplift north-central Oklahoma Nuclear Regulatory Commission Oklahoma City Oklahoma earthquake occurred Oklahoma Geological Survey Oklahoma Geology Notes Oklahoma Geophysical Observatory Oklahoma pre-1977 earthquake Omniplex Open triangles show Ouachita Pauls Valley pre-1977 earthquake data pre-1977 earthquake epicenters Reno reported felt roaoma seismic activity selected arrival short-period vertical seismogram Solid line indicates southeastern Oklahoma Station LNO Station OCO structures surface-wave amplitudes telemetry U.S. Geological Survey U.S. Nuclear Regulatory volunteer-operated seismograph stations Windingstair fault