Small earthquake in Portage County southeast of Twinsburg, OH
Origin Time: March 12, 2007, 23:18:16.41 UTC
Location: 41.280 N 81.380 W
Magnitude: 3.3 mbLg
Depth: 5 km (fixed)
A small, but strongly felt earthquake struck a several-county area of northeastern Ohio on Monday, March 12 at 7:18 Eastern Daylight Time. No damage was reported although many people were alarmed by the earthquake.
The event was felt throughout an area of about 3,000 square miles as defined by contiguous zip codes from which felt reports were received. Maximum intensities (IV) were recorded at Aurora, Northfield, and Twinsburg. A small (2.3 magnitude) earthquake occurred in this general area in 1991.
These earthquakes appear to coincide with a linear zone in deep crystalline rocks known as the Akron Magnetic Boundary. This zone extends from Akron northeastward to eastern Lake County and northwestern Ashtabula County and then beneath Lake Erie. A number of small earthquakes have occurred along this zone in the lakeshore area and just offshore beneath the lake. The 5.0-magnitude earthquake in 1986 occurred in this zone in southern Lake County.
If you felt this earthquake, please report it here.
Seismogram of the March 12, 2007 earthquake (3.3 mbLg) near Twinsburg as recorded at OhioSeis station ACSO at Alum Creek State Park, about 111 miles southwest of the epicenter. Arrival times of the P and S waves are noted.
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