Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Damaging Earthquakes

This cover consists of location and size information for historical
and recent earthquakes that caused Modified Mercalli Intensity
(MMI) VI (6) or higher in the map area. There were 26 earthquakes
that caused that level of damage. The most reknown are the
four earthquakes in the 1811- 1812 sequence; two on Dec 16,
1811, and one each on Jan 23, 1812, and Feb 7, 1812. Their
calculated Moment Magnitudes were 8.1, 7.2, 7.8, and 8.0,
respectively. The most recent damaging earthquake was on June 10,
1987 near Olney, Illinois. It had a Moment Magnitude of 5.2.

本数据集涵盖本次制图区域内，历史及近期发生的、地震烈度达到修订麦加利烈度（Modified Mercalli Intensity, MMI）VI级（6级）及以上的地震的位置与震级信息。本次统计范围内共有26场达到该破坏烈度的地震。其中最为知名的是1811—1812年发生的系列地震：1811年12月16日发生2场，1812年1月23日与2月7日各发生1场，共计4场。这四场地震的计算矩震级（Moment Magnitude）分别为8.1、7.2、7.8与8.0。本次记录中最新的破坏性地震发生于1987年6月10日，位于伊利诺伊州奥尔尼（Olney）附近，其矩震级为5.2。