Mailing Address:
ODNR Division of Geological Survey 2045 Morse Rd., Bldg. C-1 Columbus, OH 43229-6693 Phone: (614) 265-6576 Fax: (614) 447-1918 E-Mail Location Map
Earthquake Contacts: 24 Hour Earthquake Reporting Hotline: 1-855-QuakeOH 1-855-(782-5364) Media Inquiries Quake Info Center: Michael C. Hansen Phone: (740) 548-5979 Fax: (614) 447-1918 E-mail Web Page
Magnitude measures the energy released at the source of the earthquake. Magnitude is determined from measurements on seismographs.