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That too is very interesting. Thanks for the mention. I looked at some of the photos. Kindof makes you wonder if these lights don’t precede every earthquake, but are seldom noticed.

If so, some sort warning system might ensue.

There is some “small” triangular activity going on in the last few days or so. Keep in mind that the Wabash Valley Zone (in IL/IN) has been very quiet for sometime before the Friday 4/18 4:37am central time 5.2 quake (UTC 9:37am)

I find it all very interesting even if it means nothing.

Check out these 2 pages (open each one in a new window)

(one is a location map and the other is the data for the location map)

http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/US10/32.42.-90.-80.php

http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/US10/32.42.-90.-80_eqs.php (deduct 5 hours off the UTC times to get the actual Central time)

Geological Survey Updates Earthquake Threat Map
Apr 22, 2008
http://www.wctv.tv/news/headlines/18022859.html

Colors on this map show the levels of horizontal shaking that have a 2-in-100 chance of being exceeded in a 50-year period. Shaking is expressed as a percentage of g (g is the acceleration of a falling object due to gravity). (Credit: Image courtesy of U.S. Geological Survey)

According to the U.S. Geological Survey, the following changes were made on the map:

Several new faults were included or revised as a source of earthquake ground shaking in California, the Pacific Northwest and the Intermountain West.

The Wasatch fault in Utah was modeled to include the possibility of a magnitude-7.4 earthquake, in addition to smaller earthquakes along the fault.

The model for earthquakes along the New Madrid Seismic Zone in the Central United States includes a wider range of possible magnitudes and return periods between major earthquakes. The model was also adjusted to allow for sequences of earthquakes to occur in groups of three within a few years time, similar to what occurred in 1811 - 1812.

Offshore faults were added as possible sources of earthquakes near Charleston, S.C.

For the Cascadia Subduction Zone, more weight was given to a magnitude-9 earthquake that ruptures the length of the subduction zone, versus multiple smaller magnitude-8 earthquakes that fill the zone over the same 500-year time period.

Here is the older map...

New map (again)