Thyroid replacement hormones usually are well tolerated. Symptoms that occur during treatment are often due to toxic, elevated levels of thyroid hormones and resulting symptoms from hyperthyroidism.
Facts about the New Madrid Seismic Zone. The New Madrid Seismic Zone (NMSZ) is the most active seismic area in the United States east of the Rocky Mountains. The NMSZ is located in southeastern Missouri, northeastern Arkansas, western Tennessee, western Kentucky and southern Illinois.
Earthquake Frequency in the New Madrid Seismic Zone. Earthquake occurrences in southeast Missouri are not rare. Four earthquakes measuring magnitude 4.5 or greater occurred in the zone since 1974 (as of December 6, 2012).