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| | R. Street's 1811-1812 EQ Sequence (Site not responding. Last check: ) |
 | | The sequence of earthquakes that began at 02:15 A.M. local time on December 16, 1811, in what is present day NE Arkansas and SE Missouri, is the most significant seismic event to have occurred in central or eastern North America in historical times. |
 | | Figure 6 compares Equation (1) with the spatial attenuation of intensity curves by Howell and Schultz (1975), and by Gupta and Nuttli (1976); the latter two curves are scaled on the assumption that the 02:15 A.M. December 16, 1811, earthquake is an epicentral intensity XI MM event as suggested by Nuttli (1979). |
 | | And with respect to the 02:15 A.M. December 16, 1811, event, the constant term in Equation (1) which includes the epicentral intensity, becomes 13.65 for the 08:15 A.M. December 16, 1811, event, 14.06 for the January 23, 1812, event, and 14.55 for the February 07, 1812, event. |
| www.eas.slu.edu /Earthquake_Center/SEISMICITY/Street/rstreet.html (816 words) |
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