[StillwaterTownie]

I didn't feel it in Stillwater. But a number of Oklahoma City area people felt an earthquake happen early Tuesday morning. It registered 4.3. Interestingly, it was preceded by a 3.0 quake about 11 minutes beforehand. Oklahoma Earthquake Page

Report via NWS Norman.

EARTHQUAKE REPORT
RELAYED BY NATIONAL WEATHER SERVICE NORMAN OK
232 AM CDT TUE APR 16 2013


EARTHQUAKE FELT MODERATELY BY NUMEROUS PERSONS IN THE OKLAHOMA
CITY...NORMAN...MEEKER...LUTHER...AND WELLSTON AREAS. ITEMS HAVE
BEEN KNOCKED OFF WALLS IN HOMES NEAR LUTHER.


THE NATIONAL EARTHQUAKE INFORMATION CENTER IN GOLDEN COLORADO
INDICATED THE EARTHQUAKE MAGNITUDE 4.3 ON THE RICHTER SCALE WAS
CENTERED AT 35.685N 97.066W OR ABOUT 7 MILES EAST NORTHEAST OF
LUTHER OKLAHOMA AT 156 AM CDT.


ANY FURTHER INFORMATION WILL BE MADE AVAILABLE WHEN IT IS
RECEIVED FROM THE NATIONAL EARTHQUAKE INFORMATION CENTER IN
GOLDEN COLORADO.

[Shredding_Gnar78]

Scientists link oil industry with Oklahoma's biggest earthquake | The Verge

Scientists have linked oil drilling in Oklahama to the biggest earthquake in the state's history. New research, published in the journal Geology, suggests that the expansion of wastewater, injected into Oklahoma's sealed oil wells, placed enough stress on "reservoir-bounding faults" to trigger three successive earthquakes in 2011, the largest of which measured 5.7 on the Richter scale. Previously, the earthquake was deemed by the Oklahoma Geological Survey to be the result of natural causes, but new research opens the debate over the dangers wastewater injection.

[debzkidz]

We had 5 quakes over night. The 5:15 quake woke me up. It sounded like a truck rumbling down the street, and the house was shaking. I actually think I felt a couple of the earlier ones as well, but didn't realize what was happening. I typically do not wake up during the night, but something woke me up 3 different times last night. Each time, I was suddenly just awake, and I had no idea why. Each time I was so groggy, I just fell right back to sleep. There was no doubt woke me at 5:15. I knew instantly what I was feeling.

[KathrynAragon]

Originally Posted by Shredding_Gnar78

Scientists link oil industry with Oklahoma's biggest earthquake | The Verge

Scientists have linked oil drilling in Oklahama to the biggest earthquake in the state's history. New research, published in the journal Geology, suggests that the expansion of wastewater, injected into Oklahoma's sealed oil wells, placed enough stress on "reservoir-bounding faults" to trigger three successive earthquakes in 2011, the largest of which measured 5.7 on the Richter scale. Previously, the earthquake was deemed by the Oklahoma Geological Survey to be the result of natural causes, but new research opens the debate over the dangers wastewater injection.

There is a long history of earthquakes and clusters of earthquakes throughout the state of Oklahoma - which predates the practices listed above.

Oklahoma
Earthquake History

The series of great earthquakes in the New Madrid, Missouri, region in 1811 - 1812, and a strong earthquake centered in Arkansas (October 22, 1881) were probably felt in the area that is now Oklahoma.

The first earthquake known to have centered in the State occurred in September 1918. A series of shocks at El Reno produced only minor effects; the strongest was intensity V on September 10. Objects were thrown from shelves. Other shocks occurred on the next day. On December 27, 1929, another tremor centered in the same area was felt in portions of central and western Oklahoma. Some plaster cracked and at least one chimney fell (intensity VI) at El Reno. In addition, clocks stopped, objects moved, and some reports indicated the walls and floors seemed to sway. In several cities, people rushed from their homes in alarm. The total felt area included about 20,000 square kilometers.

The magnitude 5.5 April 9, 1952, earthquake centered near El Reno affected most of Oklahoma and parts of Arkansas, Iowa, Kansas, Missouri, Nebraska, and Texas. Damage from the 10:30 a.m. CST earthquake was not extensive, but many people in the epicentral area were alarmed, some to near panic. Portions of chimneys fell in El Reno and Ponca City (intensity VII). Bricks loosened from a building wall and tile facing of commercial buildings bulged at Oklahoma City. Also, plate glass windows were shattered in the business district of El Reno. The total damage amounted to several thousand dollars. Aftershocks were felt on April 11, 15, and 16, July 16, and August 14; an earthquake that was felt (IV) at Holdenville and Wewoka on October 7 apparently was unrelated to the April 9th event. Homes and buildings shook and some persons were awakened (V) at El Reno from the April 16th shock, which occurred 5 minutes after midnight. Felt reports were also received from Kingfisher, Oklahoma City, Tulsa, and Union City.

Minor damage to a building foundation and plaster (VI) at Concho resulted from two March 17, 1953, earthquakes about an hour apart. The felt area included Calumet, Edmond, El Reno, Minco, Okarche, Peidmont, and Union City.

On February 16, 1956, a shock at Edmond broke windows and cracked plaster (VI). It was also felt strongly at Guthrie, Oklahoma City, and Pawnee. Southeastern Oklahoma was disturbed by an earthquake on April 2, 1956, that produced thundering, rattling, and bumping noises that were heard by many citizens. Buildings shook and objects fell at Antlers, and many persons were alarmed (V). Minor effects were reported from other nearby towns. On October 30, 1956, an area of about 9,500 square kilometers in northeastern Oklahoma was shaken. The maximum intensity of VII was reported west of Catoosa, where a slippage of the formation caused an oil well to be shut down. Minor damage occurred at Beggs and Tulsa; and isolated felt report was received from Electra, Texas.

A broad area (approximately 31,000 square kilometers) of southwestern Oklahoma and the adjacent portion of Texas was affected by an early morning shock on June 17, 1959. Slight damage, consisting of cracks in plaster, pavement, and a house foundation (VI), occurred at Cache, Duncan, and Lawton. Houses were shaken, buildings swayed, and many persons were alarmed. A smaller earthquake on June 15 was felt by many at Ada and nearby places. Dishes were reported broken (V) and a trembling motion was observed.

On January 10, 1961, a mild shock was felt in Latimer and Pittsburgh Counties in southeastern Oklahoma. Thunderous earth sounds were heard in many places (V); no damage was reported. Another earthquake on April 27, 1961, awakened many (V) at Antlers, Coalgate, Hartshorne, Leflore, McCurtain, Panola, Poteau, Talihina, and Wilburton. Once again, thunderous, deep rumbling earth sounds were heard throughout the area.

An October 14, 1968, earthquake caused minor damage at Durant. Walls cracked, and glass in two structures broke (VI). The press reported that a 5 foot tall advertising stand fell over, and canned goods fell from a rack in a supermarket. Slight foreshocks were felt at Durant on October 10 and 11. Intensity IV effects from the October 14 shock were also noted at Caddo.

A magnitude 4.6 earthquake caused some cracked plaster (V) at Wewoka on May 2, 1969. Intensity V effects were reported at several other towns in the region. The total felt area included approximately 33,700 square kilometers in eastern Oklahoma.

Abridged from Earthquake Information Bulletin, Volume 8, Number 2, March - April 1976, by Carl A. von Hake.

Oklahoma

[johnspecial]

Originally Posted by StillwaterTownie

I didn't feel it in Stillwater. But a number of Oklahoma City area people felt an earthquake happen early Tuesday morning. It registered 4.3. Interestingly, it was preceded by a 3.0 quake about 11 minutes beforehand. Oklahoma Earthquake Page

Report via NWS Norman.

EARTHQUAKE REPORT
RELAYED BY NATIONAL WEATHER SERVICE NORMAN OK
232 AM CDT TUE APR 16 2013


EARTHQUAKE FELT MODERATELY BY NUMEROUS PERSONS IN THE OKLAHOMA
CITY...NORMAN...MEEKER...LUTHER...AND WELLSTON AREAS. ITEMS HAVE
BEEN KNOCKED OFF WALLS IN HOMES NEAR LUTHER.


THE NATIONAL EARTHQUAKE INFORMATION CENTER IN GOLDEN COLORADO
INDICATED THE EARTHQUAKE MAGNITUDE 4.3 ON THE RICHTER SCALE WAS
CENTERED AT 35.685N 97.066W OR ABOUT 7 MILES EAST NORTHEAST OF
LUTHER OKLAHOMA AT 156 AM CDT.


ANY FURTHER INFORMATION WILL BE MADE AVAILABLE WHEN IT IS
RECEIVED FROM THE NATIONAL EARTHQUAKE INFORMATION CENTER IN
GOLDEN COLORADO.

Love the bias in your title. Surely you weren't trying to attract the fracking alarmists.

The second strongest quake (5.5) in Oklahoma occurred in 1951. That's one tenth of a point less than the 5.6 quake a few years ago. Not much fracking going on in 1951. Scientists are humans and wrong all the time.

If you people had any idea how big these fault lines are compared to the fracking wells.

[StillwaterTownie]

I take no stand on fracking as it relates to the cause of Oklahoma earthquakes, since viewpoints of geo experts are divided on it.

[StillwaterTownie]

Originally Posted by johnspecial

Love the bias in your title. Surely you weren't trying to attract the fracking alarmists.

The second strongest quake (5.5) in Oklahoma occurred in 1951. That's one tenth of a point less than the 5.6 quake a few years ago. Not much fracking going on in 1951. Scientists are humans and wrong all the time.

If you people had any idea how big these fault lines are compared to the fracking wells.

And do you have any idea how fracking may be disturbing these big fault lines? And how much stronger these earthquakes have to get before the governor is willing to upset the energy industry by declaring a moratorium on fracking or at least publicly demanding further scientific investigation?