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http://news.yahoo.com/swarm-earthquakes-rattles-rural-alabama-reason-unclear-124125320.html
It will be interesting to know the cause of increased seismic activity in what has been a seismically quiet region.
The eastern US, around the Appalachian mountain chain does have small earthquakes periodically. However the earthquakes are not expected to be strong, but they can occur infrequently.
Tennessee earthquake of July 27, 1977
http://www.bssaonline.org/content/69/4/1081.short
Along the Mississippi River.
2.7 4km NE of Ridgely, Tennessee 2015-06-14 13:11:54 UTC
2.6 8km SE of Ridgely, Tennessee 2015-06-14 07:22:53 UTC
http://pubs.usgs.gov/gip/birth/birth.pdf
https://en.wikipedia.org/wiki/Appalachian_Mountains
https://en.wikipedia.org/wiki/Geology_of_the_Appalachians
Attached image shows locations of earthquakes in SE US from Jan 1, 1970 through today. The zoomed in image shows about 500 earthquakes. The zoomed out image shows 671 earthquakes.
Records from the U.S. Geological Survey show the first of 14 earthquakes occurred on Nov. 20, when a magnitude 3.8 earthquake was recorded about 10 miles northwest of the community of Eutaw. The second occurred in mid-December, followed by another in January and three within a few hours of each other on Feb. 19.
The tremors have continued ever since, with the most recent occurring June 6, when a magnitude 3.0 quake rattled the area. All the tremors have been weaker than the initial jolt in November, . . . .
More than a dozen weak earthquakes have followed in the seven months since in west Alabama's rural Greene County, and geologists are trying to figure out what is causing the seismic swarm in an area of the South more prone to tornadoes than earthquakes.
It will be interesting to know the cause of increased seismic activity in what has been a seismically quiet region.
The eastern US, around the Appalachian mountain chain does have small earthquakes periodically. However the earthquakes are not expected to be strong, but they can occur infrequently.
Tennessee earthquake of July 27, 1977
http://www.bssaonline.org/content/69/4/1081.short
Along the Mississippi River.
2.7 4km NE of Ridgely, Tennessee 2015-06-14 13:11:54 UTC
2.6 8km SE of Ridgely, Tennessee 2015-06-14 07:22:53 UTC
http://pubs.usgs.gov/gip/birth/birth.pdf
https://en.wikipedia.org/wiki/Appalachian_Mountains
https://en.wikipedia.org/wiki/Geology_of_the_Appalachians
Attached image shows locations of earthquakes in SE US from Jan 1, 1970 through today. The zoomed in image shows about 500 earthquakes. The zoomed out image shows 671 earthquakes.
Attachments
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