The absence of an intensity value indicates that no intensities have been assigned to earthquakes at that location. A Roman numeral to the left of a triangle is the maximum Modified Mercalli intensity (Wood and Neumann, 1931) of all earthquakes located at that geographic position. The number of earthquakes at each location is shown on the map by the number to the right of the triangle. A triangle represents the epicenter plotted to a tenth of a degree. Earthquake Catalog - Look up past earthquakes. The latitude and longitude were rounded to the nearest tenth of a degree and sorted so that all identical locations were grouped together and counted. Past earthquakes in Alabama: 2021 - list, stats and map Autauga Baldwin Barbour Bibb Blount Bullock Butler Calhoun Chambers Cherokee Chilton County Choctaw Clarke Clay Cleburne Coffee Colbert Conecuh Coosa Covington. See if there was a quake in Alabama just now Find how many recent quakes there. The data in table 1 were used to compile the seismicity map. Known or suspected explosions are listed in table 1 but are not plotted on the seismicity map.
The data shown in table 1 are estimates of the most accurate hypocenter, magnitude, and intensity of each earthquake, on the basis of historical and current information.
Some epicenters were relocated on the basis of new information. The map of Alabama was in press by the end of the year, the maps of. This is achieved by displaying earthquake zones that combine, in a single measure, the three components of seismic risk: bedrock shaking, amplification of. Other intensity values were updated from new and additional data sources that were not available at the time of original compilation. Pardee also studied the effects of the earthquake of November 17 in the Big Horn. The data have been reexamined and intensities assigned where none had been assigned before, on the basis of available data. The earthquake data shown on this map and listed in table 1 are a list of earthquakes that were originally used in preparing the Seismic Risk Studies in the United States (Algermissen, 1969) which have been recompiled and updated through 1977.
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