[3] The broad, flat coastal plain stretches across the southern portion of the state, extending north from the Gulf coast to the Fall Line near Montgomery, Alabama.
[3][6] Extreme north Alabama marks the southeast border of the Interior Plains province, characterized by flat or gently rolling terrain.
[7][8] The largest earthquake in recorded Alabama history measured an estimated magnitude of 5.1 and occurred October 18, 1916 near Irondale, and resulted in widespread panic, damage to structures, and dramatic changes in water well levels.
The April 29, 2003 earthquake centered near Fort Payne, Alabama was felt over a wide area and received extensive media coverage.
Conclusive evidence of the origin of the Wetumpka Impact Crater was found by Auburn University geology professor David T. King in 1998.