 Complete the following phrase:  Tennessee is considered seismically active and contains two major seismic zones, although destructive earthquakes rarely occur in the state. The Eastern Tennessee Seismic Zone spans the entirety of East Tennessee from northwestern Alabama to southwestern Virginia. The region is considered one of the most seismically active zones in the Southeastern United States, and frequently produces low-magnitude earthquakes. The New Madrid Seismic Zone is located in the northwestern part of the state. This seismic zone produced 