Post by ۞Quaalude™۞ on Jul 25, 2013 3:55:21 GMT -5
December 16, 1811, 0815 UTC (2:15 a.m.); (M ~7.2 – 8.1[2]) epicenter in northeast Arkansas. It caused only slight damage to man-made structures, mainly because of the sparse population in the epicentral area. The future location of Memphis, Tennessee experienced level IX shaking on the Mercalli intensity scale. A seismic seiche propagated upriver, and Little Prairie (a village that was on the site of the former Fort San Fernando, near the site of present-day Caruthersville, Missouri) was heavily damaged by soil liquefaction.[3]
December 16, 1811, 1415 UTC (8:15 a.m.); (M ~7.2–8.1) epicenter in northeast Arkansas. This shock followed the first earthquake by six hours and was similar in intensity.[2]
January 23, 1812, 1500 UTC (9 a.m.); (M ~7.0–7.8[2]) epicenter in the Missouri Bootheel. The meizoseismal area was characterized by general ground warping, ejections, fissuring, severe landslides, and caving of stream banks. Johnson and Schweig attributed this earthquake to a rupture on the New Madrid North Fault. This may have placed strain on the Reelfoot Fault.[3]
February 7, 1812, 0945 UTC (4:45 a.m.); (M ~7.4–8.0[2]) epicenter near New Madrid, Missouri. New Madrid was destroyed. At St. Louis, Missouri, many houses were severely damaged, and their chimneys were toppled. This shock was definitively attributed to the Reelfoot Fault by Johnston and Schweig. Uplift along a segment of this reverse fault created temporary waterfalls on the Mississippi at Kentucky Bend, created waves that propagated upstream, and caused the formation of Reelfoot Lake by obstructing streams in what is now Lake County, Tennessee.[3]
Susan Hough, a seismologist of the United States Geological Survey (USGS), has recently estimated the earthquakes' magnitudes as "right around magnitude 7. Possibly a bit below, possibly a bit above, but not as big as 7.5
In 2009 two studies based on eight years of GPS measurements indicated that the faults were moving at no more than 0.2 millimeters (0.0079 in) a year.[20] In contrast, the rate of slippage on the San Andreas Fault averages as much as 37 mm (1.5 in) a year across California.Plan being 400 miles inland from any sea coast & 600 miles away from VOLCANOES & no where near the Mississippi River when this thing passes by earth. Study 1811 thru? 1812 when 2 comets flew past earth & New Madrid fault went ultra active. It was months of earthquakes & Mississippi ran BACKWARDS QC
December 16, 1811, 1415 UTC (8:15 a.m.); (M ~7.2–8.1) epicenter in northeast Arkansas. This shock followed the first earthquake by six hours and was similar in intensity.[2]
January 23, 1812, 1500 UTC (9 a.m.); (M ~7.0–7.8[2]) epicenter in the Missouri Bootheel. The meizoseismal area was characterized by general ground warping, ejections, fissuring, severe landslides, and caving of stream banks. Johnson and Schweig attributed this earthquake to a rupture on the New Madrid North Fault. This may have placed strain on the Reelfoot Fault.[3]
February 7, 1812, 0945 UTC (4:45 a.m.); (M ~7.4–8.0[2]) epicenter near New Madrid, Missouri. New Madrid was destroyed. At St. Louis, Missouri, many houses were severely damaged, and their chimneys were toppled. This shock was definitively attributed to the Reelfoot Fault by Johnston and Schweig. Uplift along a segment of this reverse fault created temporary waterfalls on the Mississippi at Kentucky Bend, created waves that propagated upstream, and caused the formation of Reelfoot Lake by obstructing streams in what is now Lake County, Tennessee.[3]
Susan Hough, a seismologist of the United States Geological Survey (USGS), has recently estimated the earthquakes' magnitudes as "right around magnitude 7. Possibly a bit below, possibly a bit above, but not as big as 7.5
In 2009 two studies based on eight years of GPS measurements indicated that the faults were moving at no more than 0.2 millimeters (0.0079 in) a year.[20] In contrast, the rate of slippage on the San Andreas Fault averages as much as 37 mm (1.5 in) a year across California.Plan being 400 miles inland from any sea coast & 600 miles away from VOLCANOES & no where near the Mississippi River when this thing passes by earth. Study 1811 thru? 1812 when 2 comets flew past earth & New Madrid fault went ultra active. It was months of earthquakes & Mississippi ran BACKWARDS QC