1886 Charleston earthquake
|This article needs additional citations for verification. (February 2013)|
|Date||August 31, 1886|
|Countries or regions||United States, South Carolina|
|Total damage||5–6 million |
|Max. intensity||X (Intense) |
The Charleston Earthquake of 1886 was a powerful intraplate earthquake that hit Charleston, South Carolina, and the East Coast of the US. After the 1811 and 1812 earthquakes in New Madrid, Missouri, it is one of the most powerful and damaging quakes to hit the southeastern United States. The shaking occurred at about 9:50 p.m. on August 31, 1886, and lasted just under a minute. The earthquake caused severe damage in Charleston, damaging 2,000 buildings and causing $6 million worth in damage (over $141 million in 2009 dollars), while in the whole city the buildings were only valued at approximately $24 million. Between 60 and 110 lives were lost. Very little to no historical earthquake activity occurred in the Charleston area prior to the 1886 event, which is unusual for any seismic area.
The earthquake is estimated to have been between 6.6 and 7.3 on the Richter scale with a Mercalli Intensity of X. Sandblows were common throughout the affected area due to liquefaction of the soil. More than 300 aftershocks of the 1886 earthquake occurred within 35 years. Minor earthquake activity that still continues in the area today may be a continuation of aftershocks. It also caused 60 fatalities.
The 1886 earthquake is a heavily studied example of an intraplate earthquake. The earthquake is believed to have occurred on faults formed during the break-up of Pangaea. Similar faults are found all along the east coast of North America. It is thought that such ancient faults remain active from forces exerted on them by present-day motions of the North American Plate. The exact mechanisms of intraplate earthquakes are a subject of much ongoing research.
Major damage occurred as far away as Tybee Island, Georgia, (more than 60 miles away) and structural damage was reported several hundred miles from Charleston (including central Alabama, central Ohio, eastern Kentucky, southern Virginia and western West Virginia). It was felt as far away as Boston to the north, Chicago and Milwaukee to the northwest, as far west as New Orleans, as far south as Cuba, and as far east as Bermuda.
Earthquake bolts were added to existing unreinforced masonry buildings to add support to the structure without having to demolish the structure due to instability. The bolts pass through the existing masonry walls tying walls on opposite sides of the structure together for stability.
- Stover, C.W.; Coffman, J.L. (1993), Seismicity of the United States, 1568–1989 (Revised), U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, pp. 348–351
- Bollinger, G. A. (1972), "Historical and recent seismic activity in South Carolina", Bulletin of the Seismological Society of America (Seismological Society of America) 62 (3): 851–864
- Talwani, P.; Cox, J. (1985), "Paleoseismic Evidence for Recurrence of Earthquakes near Charleston, South Carolina", Science (American Association for the Advancement of Science) 229 (4711): 379–381
- Tarr, A.C.; Talwani, P.; Rhea, S.; Carver, D.; Amick, D. (1981), "Results of recent South Carolina seismological studies", Bulletin of the Seismological Society of America (Seismological Society of America) 71 (6): 1883–1902
- The Charleston Earthquake of 1886 – University of South Carolina
- Historical Earthquakes: Charleston, South Carolina – United States Geological Survey
- Fault Map of South Carolina – South Carolina Department of Natural Resources
- Waring Historical Library 1886 Charleston Earthquake Photo Collection – Lowcountry Digital Library
- Overview of an archival collection on the Charleston earthquake – Winterthur Museum, Garden and Library