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In January 1879, a shock occurred near St. <br />Augustine that is reported to have knocked <br />plaster from walls and articles from shelves. <br />Similar effects were reported in Daytona Beach. <br />The shock was felt in Tampa, throughout central <br />Florida, and in Savannah, Georgia as well <br />(Zirbes, 1971). <br />In January 1880, another earthquake occurred. <br />This time Cuba was the focal point. Shock <br />waves were sent as far north as the town of Key <br />West, Florida (Zirbes, 1971). <br />In August 1886, Charleston, South Carolina was <br />the center of a shock that was felt throughout <br />northern Florida. It rang church bells in St. <br />Augustine and severely jolted other towns along <br />sections of Florida's east coast. <br />Jacksonville residents felt many of the strong <br />after shocks that occurred in September, <br />October, and November 1886 (Zirbes, 1971). <br />In June 1893, Jacksonville experienced a minor <br />shock that lasted about 10 seconds. Another <br />earthquake occurred in October 1893, which <br />also did not cause any damage (Zirbes, 1971). <br />In November 1948, doors and windows rattled in <br />Captiva Island, west of Ft. Myers. It was <br />reportedly accompanied by sounds like distance <br />heavy explosions (Zirbes, 1971). <br />In November 1952, a slight tremor was felt in <br />Quincy, a town located 20 miles northwest of <br />Tallahassee. Windows and doors rattled, but no <br />damage was reported (Zirbes, 1971). <br />(3) Sinkholes and Subsidence <br />Sinkholes are a common feature of Florida's landscape. <br />They are alone one of many kinds of karst landforms, <br />which include caves, disappearing streams, springs, <br />and underground drainage systems, all of which occur <br />in Florida. Karst is a generic term which refers to the <br />characteristic terrain produced by erosional processes <br />Indian River County Comprehensive Emergency Management Plan Basic Page 26 <br />