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Unusual earthquakes in Alabama, US

  1. Jun 14, 2015 #1

    Astronuc

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    Staff: Mentor

    http://news.yahoo.com/swarm-earthquakes-rattles-rural-alabama-reason-unclear-124125320.html [Broken]
    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.
     

    Attached Files:

    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Jun 14, 2015 #2

    DaveC426913

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    Gold Member

    Perhaps God has convinced Lucifer that his historical hatred of trailer parks is a just cause?
     
  4. Jun 14, 2015 #3

    SteamKing

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    Charleston, SC was hit by a particularly strong quake in 1886. Prior to the 1906 quake and fire which hit San Francisco, this was one of the most damaging quakes to hit a populated area in the continental US.

    https://en.wikipedia.org/wiki/1886_Charleston_earthquake

    As damaging as the San Francisco quake was, the strongest quake thought to have occurred in historical times in the eastern US occurred in 1811 near New Madrid, Missouri, approximately in the vicinity of where Missouri, Tennessee,and Kentucky come together:

    https://en.wikipedia.org/wiki/1811–12_New_Madrid_earthquakes

    Damage caused by these quakes was minimal because the area was sparsely inhabited at the time. These quakes, however, were strong enough to change the course of the Mississippi River in the area affected.

    While not particularly active, there are several known fault lines which occur in the SE United States. At one time, the Rev. L.J. Eisele maintained the seismograph station at Spring Hill College in Mobile, and he was noted for issuing the first alerts to the AP about the quake which struck Chile in 1960 and the quake which struck Alaska in 1964.

    https://news.google.com/newspapers?...AAIBAJ&sjid=8Z0EAAAAIBAJ&pg=6823,406322&hl=en
     
  5. Jun 14, 2015 #4

    Astronuc

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    Strong earthquakes > mag 5 are expected in the west coast states of California, Oregon and Washington, but particularly in California, but not so much in the Appalachian states.

    On the other hand, they can happen, as recently demonstrated by the 5.8 mag near Mineral, Virginia and the North Anna nuclear plant.
    At 1:51 p.m. EDT on August 23, a magnitude 5.8 earthquake occurred near Mineral, Virginia, close to the North Anna Power Station. On August 25 a 4.5 magnitude aftershock was recorded.

    http://www.nrc.gov/about-nrc/emerg-preparedness/virginia-quake-info/va-quake-summary.pdf

    http://earthquake.usgs.gov/earthquakes/eventpage/usp000j6xc#general_summary
    http://earthquake.usgs.gov/earthquakes/events/2011virginia/eost18821.pdf
     
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