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.
Email. The New Madrid fault in the central United States is particularly dangerous. The fault is among the most active in the country, running from St. Louis to Memphis. As the outpouring of support for earthquake-ravaged Haiti continues, seismologists say a similar catastrophe can happen thoughout the United States.