A powerful earthquake struck Friday off the coast of Chile, rattling a region hit by a massive temblor and tsunami a year ago, officials said.
There was no initial reports of casualties or damage, but media reports said the quake was felt in a wide area of central Chile.
The US Geological Survey and Chile's national emergency office said the quake occurred in the Pacific some 70 kilometers (45 kilometers) from the city of Concepcion.
The USGS initially reported a major 7.0 magnitude, and later revised that to 6.8, which can still cause devastation.
The quake struck at 2005 GMT near a region in central Chile that was devastated by an 8.8 magnitude earthquake and tsunami on February 27, 2010.
Last year's disaster led to more than 500 deaths and $30 billion dollars in damage, and led to an inquiry over the lack of a timely tsunami warning.
The Pacific Tsunami Warning Center said that "a destructive Pacific-wide tsunami is not expected," from this quake but that earthquakes of this size "sometimes generate local tsunamis that can be destructive along coasts" within a 100 kilometers of the epicenter.
"Authorities in the region of the epicenter should be aware of this possibility and take appropriate action," it said.
The USGS said the location of the earthquake was 395 kilometers (245 miles) southwest of Santiago.
This event has been reviewed by a seismologist.
* Friday, February 11, 2011 at 20:05:31 UTC
* Friday, February 11, 2011 at 05:05:31 PM at epicenter
* Time of Earthquake in other Time Zones
Location 36.479°S, 73.000°W
Depth 28 km (17.4 miles) set by location program
Region OFFSHORE BIO-BIO, CHILE
Distances 45 km (30 miles) N of Concepcion, Bio-Bio, Chile
80 km (50 miles) SW of Cauquenes, Maule, Chile
85 km (55 miles) WNW of Chillan, Bio-Bio, Chile
395 km (245 miles) SSW of SANTIAGO, Region Metropolitana, Chile
Location Uncertainty horizontal +/- 15 km (9.3 miles); depth fixed by location program
Parameters NST=312, Nph=312, Dmin=518.7 km, Rmss=1.48 sec, Gp= 50°,
M-type="moment" magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=8
USGS NEIC (WDCS-D)
Event ID usb0001cku
Magnitude 5.9 BIO-BIO, CHILE
Friday, February 11, 2011 at 23:39:21 UTC
Date-Time Friday, February 11, 2011 at 23:39:21 (UTC) - Coordinated Universal Time
Friday, February 11, 2011 at 08:39:21 PM local time at epicenter
Time of Earthquake in other Time Zones
Location 37.16S 73.59W
Depth 18.6 kilometers
Region BIO-BIO, CHILE
Distances 50 km (30 miles) N of Lebu, Bio-Bio, Chile
60 km (40 miles) SW of Concepcion, Bio-Bio, Chile
115 km (70 miles) WNW of Los Angeles, Bio-Bio, Chile
490 km (305 miles) SSW of SANTIAGO, Region Metropolitana, Chile
Location Uncertainty Error estimate: horizontal +/- 18.6 km; depth +/- 4.5 km
Parameters Nst=164, Nph=164, Dmin=475.6 km, Rmss=1.21 sec, Erho=18.6 km, Erzz=4.5 km, Gp=56.0 degrees
Source USGS NEIC (WDCS-D)
Event ID usb0001cqt
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