Monday, August 2, 2010

RARE Earthquake Rattles Louisiana, Aug. 1st - Magnitude 3.0

Tectonic Summary

Most of North America east of the Rocky Mountains has infrequent earthquakes. Here and there earthquakes are more numerous, for example in the New Madrid seismic zone centered on southeastern Missouri, in the Charlevoix-Kamouraska seismic zone of eastern Quebec, in New England, in the New York - Philadelphia - Wilmington urban corridor, and elsewhere. However, most of the enormous region from the Rockies to the Atlantic can go years without an earthquake large enough to be felt, and several U.S. states have never reported a damaging earthquake. The earthquakes that do occur strike anywhere at irregular intervals.

Earthquakes east of the Rocky Mountains, although less frequent than in the West, are typically felt over a much broader region. East of the Rockies, an earthquake can be felt over an area as much as ten times larger than a similar magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake typically can be felt at many places as far as 100 km (60 mi) from where it occurred, and it infrequently causes damage near its source. A magnitude 5.5 eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where it occurred, and sometimes causes damage as far away as 40 km (25 mi).

Earthquakes everywhere occur on faults within bedrock, usually miles deep. Most of the region's bedrock was formed as several generations of mountains rose and were eroded down again over the last billion or so years.

At well-studied plate boundaries like the San Andreas fault system in California, often scientists can determine the name of the specific fault that is responsible for an earthquake. In contrast, east of the Rocky Mountains this is rarely the case. All parts of this vast region are far from the nearest plate boundaries, which, for the U.S., are to the east in the center of the Atlantic Ocean, to the south in the Caribbean Sea, and to the west in California and offshore from Washington and Oregon. The region is laced with known faults but numerous smaller or deeply buried faults remain undetected. Even most of the known faults are poorly located at earthquake depths. Accordingly, few earthquakes east of the Rockies can be linked to named faults. It is difficult to determine if a known fault is still active and could slip and cause an earthquake. In most areas east of the Rockies, the best guide to earthquake hazards is the earthquakes themselves.


Historic Earthquakes - Largest Earthquake in Louisiana
Near Napoleonville, Assumption Parish, Louisiana
1930 10 19 12:17 UTC
Magnitude 4.20
Intensity VI

The earthquake damaged chimneys and broke windows at Napoleonville and cracked plaster at White Castle, northwest of Napoleonville. Many people in the area rushed into the streets.


  1. notice any odd rainbows or prism clouds in the sky beforehand? Heard of HAARP? Check

  2. Hey, there was a huge rainbow down here where I live on Sunday afternoon that stayed in place brightly for close to half an hour.

  3. My friend Kermit the frog said it was definitely the Rainbow Connection

  4. I saw an odd rainbow. It was black and white. Wonder what that means? Is it the end of the world? What about the blood moon? Should we be looking for that?

  5. Odd location. Have you seen the actual permit for the BP well that shows its location? I am not a surveyor, but the coordinates of the earthquake and the location of the well are looking pretty close. Also, have you seen the video of the floor of the ocean bulging near the well? check out these links:

  6. We had a blood moon a week ago, didn't you see it?

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