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Sc earthquake guide CEarthquakes in South Carolina Earthquakes are probably the most frightening naturally occurring hazard encountered Why Earthquakes typically occur with little or no warning There is no escape from an earthquake While South Carolina is

CEarthquakes in South Carolina Earthquakes are probably the most frightening naturally occurring hazard encountered Why Earthquakes typically occur with little or no warning There is no escape from an earthquake While South Carolina is usually not known for earthquakes ten to twenty earthquakes are recorded annually and two to ve earthquakes are felt each year These earthquakes tend to be less than magnitude on the magnitude scale and cause little damage Earthquake Causes An earthquake is the violent shaking of the earth caused by a sudden movement of rock beneath its surface Plate Tectonics Although earthquakes can occur anywhere on earth the majority of earthquakes worldwide occur at plate boundaries These earthquakes are known as interplate earthquakes In contrast South Carolina is located within the interior of the North American plate far from any plate boundary Earthquakes occuring within a plate are intraplate earthquakes Little is known as to why intraplate earthquakes occur The most widely accepted model is that several geologically old fault systems of varying orientation within the subsurface are being reactivated while being subjected to stress This stress buildup may be due to the Plate Tectonic Theory For hundreds of millions of years the forces of continental drift have reshaped the Earth Continental drift is based on the concept that the continents bumped into and slid over and under each other and at some later time broke apart Today most people accept the theory that the Earth's crust is on the move Paci c Plate North American Plate Caribbean Plate Cocos Plate Eurasian Plate Nazca Plate Antarctica Plate South American Plate South Carolina ? s Fault System Most of South Carolina ? s earthquakes occur in the Coastal Plain where the underlying rocks are very faulted or broken from the break-up of the plates These cracks in the deep rocks mean that this area of the plate is weak If pressure is exerted on the edge of the plate some of these faults breaks will allow the rocks to move Faults in South Carolina have been mapped and estimated Fault rupture is not the only cause of earthquakes Small earthquakes may also occur near dams from water South Carolina Earthquakes from pressure and near the Appalachian Mountains to Present Threat Level for South Carolina Currently there is no reliable method for predicting the time place and size of an earthquake Several areas of Destruction Based South Carolina regularly experience earthquakes and have experienced strong earthquakes in the past on Intensity Approximately of all earthquakes in the state occur in the Coastal Plain with most clustered around three Complete areas of the State Ravenel-Adams Run-Hollywood Middleton-Place- Summerville and Bowman There is a destruction consensus among seismologists that where earthquakes have occurred before they can again The two most signi cant historical earthquakes in South Carolina were the Charleston earthquake and the Union County earthquake The August earthquake which struck in the Summerville Charleston area is the Cracks in walls windows broken Things would be thrown o shelves largest