THE MW 4.2 PERRY COUNTY EARTHQUAKE OF 10 NOVEMBER 2012: EVIDENCE OF THE EASTERN TENNESSEE SEISMIC ZONE IN SOUTHEASTERN KENTUCKY
There is a well-documented spatial correlation between the ETSZ seismicity and the New York-Alabama Magnetic Lineament (NYAL): the majority of seismicity occurs to the southeast and proximal to the lineament. Guided by patterns of hypocenter locations and the location of the NYAL, we subdivided ETSZ seismicity into four subzones. In contrast to seismicity in subzones to the southwest, in the northeastern-most subzone (northeastern Tennessee and southeastern Kentucky), earthquakes are more diffuse and tend to occur to the northwest of the NYAL, including the Perry County event and all other light-class (magnitude 3.9 and greater) earthquakes. Though diffuse, seismicity in this and the adjacent subzone to the southwest (where most seismicity occurs), is largely bounded to the west by a crustal body evidenced by a high-seismic-velocity anomaly in northern Tennessee and prominent potential-fields anomalies, commonly associated with the East-Continent Gravity High.