Which seismic zone triggered the 2010 Indiana earthquake?
2010 Indiana earthquake The 2010 Indiana earthquake registered 3.8 on the moment magnitude scale and struck near Greentown and Kokomo on December 30, 2010 at 12:55:21 UTC at a depth of 3 mi. The quake occurred approximately 50 miles north of Indiana's capital, Indianapolis. It joins only three other earthquakes that have affected the northern Indiana area since 1999. The “extremely rare and unprecedented” earthquake had the largest magnitude of a northern Indiana earthquake in 175 years. Despite being considered a rare occurrence, the affected region of northern Indiana lies near many fault lines including the Wabash Valley Seismic Zone and the New Madrid Seismic Zone. Both zones are hotspots for tectonic activity, with the Wabash Valley Fault Zone reaching earthquake depths up to 18 km (11.4 mi.) deep. It was incorrectly recorded by nearby stations as a 4.2 magnitude before being downgraded to 3.8. No significant damage was reported from the incident, but the quake was felt by thousands, spanning across multiple cities and states. Towns as far away as Kalamazoo, Michigan and states as far as Wisconsin and Kentucky reported the earthquake.
1983 Popayán earthquake The 1983 Popayán earthquake (Spanish: "El Terremoto de Popayán" ) occurred on 31 March in Popayán, Colombia. It had a magnitude of at least 5.5 with an epicenter south west of Popayán at a depth of 12-15 km . The earthquake killed 267 people and resulted in the passing of new laws requiring earthquake resistant building materials in zones at risk of tremors.