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Posts Tagged ‘Arkansas earthquake’

Significant Quake Hits Arkansas

Posted by feww on February 28, 2011

Earthquake Measuring up to 5.3Mw Strikes Arkansas

The shock was the largest of a cluster of about a dozen tremors which have struck the area in the last couple of weeks. The quake struck at a depth of about 4km some 59 km (37 miles) north of Little Rock, AR.

Earthquake Details
Region: Arkansas
Time: 2011-02-28 05:00:50.2 UTC
Magnitude: 5.3
Epicenter: 92.34°W 35.43°N
Depth: 5 km
Status: Automatic [NOT confirmed by a geologist]
Source: GFZ Potsdam – Earthquake Bulletin

Map Centered at 35°N, 92°W


EQ Location Map. Source ANSS via USGS. Map enhanced by FIRE-EARTH.

Earthquake Details [USGS]

  • Magnitude: 4.7
  • Date-Time:
    • Monday, February 28, 2011 at 05:00:50 UTC
    • Sunday, February 27, 2011 at 11:00:50 PM at epicenter
  • Location: 35.265°N, 92.344°W
  • Depth: 3.8 km (2.4 miles)
  • Region: ARKANSAS
  • Distances:
    • 6 km (4 miles) NE (46°) from Greenbrier, AR
    • 7 km (4 miles) S (187°) from Guy, AR
    • 9 km (6 miles) SE (128°) from Twin Groves, AR
    • 22 km (14 miles) NNE (27°) from Conway, AR
    • 59 km (37 miles) N (359°) from Little Rock, AR
  • Location Uncertainty : horizontal +/- 0.6 km (0.4 miles); depth +/- 0.7 km (0.4 miles)
  • Source:  Cooperative New Madrid Seismic Network
  • Event ID: nm022811a

A VOLCANIC ERUPTION IN ARKANSAS?

“…On the third day of December last, a singular noise was heard here. It has been differently described by those who heard it as like a blast in a wall, the explosion of a meteor, or a single distant clap of heavy thunder. So far as ascertained, the nearer the center or place of explosion, there was a rumbling and a sensible vibration of the earth.

“Much speculation was had as to its cause. It was not probable that it was thunder, for it was mid-winter and the sky was clear; nor blasting in a well, for people do not work in wells in the wet and wintry season. Upon inquiry we found that the explosion had been heard as far as Fort Gibson, and generally in a circle whose diameter is two hundred miles and expected to find some notice of it in the papers of your city. The other day, Col. Logan, of Scott County, visited our city and gave us an apparent solution of the mystery. “It appears, from his statement, that Mr. Wm. Gipson, while bear hunting on Christmas day, attempted to cross Dry Creek, situated in T 5 N, R. 26 W., but found the mountain to be on fire. Gipson describes it as sending forth smoke at the top which at night time has a ruddy glare and is visible for miles…The ground is heated, and the sides of the mountain are numerous fissures, through which vapor is constantly escaping…”  [Excerpts from an article printed by the Arkansas Gazette, January 15, 1856.]

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