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Florida, and in Savannah, Georgia as well (USDOI, USGS, <br />2004). <br />• In January 1880 another earthquake occurred, this time <br />with Cuba as the focal point. Shock waves were sent as far <br />north as the town of Key West (USDOI, USGS, 2004). <br />• In August 1886, Charleston, South Carolina was the center <br />of a shock that was felt throughout northern Florida. It rang <br />church bells in St. Augustine and severely jolted other <br />towns along sections of Florida's east coast. Jacksonville <br />residents felt many of the strong aftershocks that occurred <br />in September, October, and November 1886 (USDOI, <br />USGS, 2004). <br />• In June 1893, Jacksonville experienced a minor shock that <br />lasted about 10 seconds. Another earthquake occurred in <br />October 1893, which also did not cause any damage <br />(USDOI, USGS, 2004). <br />• In November 1948, doors and windows rattled in Captiva <br />Island, west of Ft. Myers. It was reportedly accompanied <br />by sounds like distant heavy explosions (USDOI, USGS). <br />• In November 1952, a slight tremor was felt in Quincy, a <br />town located 20 miles northwest of Tallahassee. Windows <br />and doors rattled, but no damage was reported (USDOI, <br />USGS). <br />• On July 16, 2016 an earthquake struck off the coast of <br />Florida. The 3.7-magnitud quake had an epicenter that <br />was 104 miles east-northeast of Daytona Beach. Some <br />weak tremors were reported and picked up by scientific <br />instruments on the mainland, but the quake was too <br />weak to cause any damage. <br />M. Seismic Hazards (Sinkholes and Subsidence) — Hazard <br />Identification. Sinkholes are a common feature of Florida's <br />landscape. They are only one of many kinds of karst <br />landforms, which include caves, disappearing streams, <br />springs, and underground drainage systems, all of which occur <br />in Florida. Karst topography is a generic term that refers to the <br />characteristic terrain produced by erosional processes <br />associated with the chemical weathering and dissolution of <br />limestone or dolomite, the two most common carbonate rocks <br />in Florida. Dissolution of carbonate rocks begins when they <br />are exposed to acidic water. Most rainwater is slightly acidic <br />and usually becomes more acidic as it moves through <br />decaying plant debris. Limestones in Florida are porous, <br />allowing the acidic water to percolate through them, dissolving <br />Indian River County Comprehensive Emergency Management Plan Basic Page 55 <br />