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A large shallow 6.6-magnitude earthquake struck off the coast of Mexico Thursday.

The quake struck just after 1 p.m. ET about 235 kilometres southwest of Tomatlan, according to the U.S. Geological Survey (USGS).

The quake was initially measured at 6.9-magnitude.

6.9 earthquake, 235km SW of Tomatlan, Mexico. 2016-01-21 11:07:00 at epicenter (11m ago, depth 10km). https://t.co/ODXU5KRvGs — Earthquakes Tsunamis (@NewEarthquake) January 21, 2016

Revised (6.9 -> 6.6): 6.6 earthquake, 215km SW of Tomatlan, Mexico. 2016-01-21 11:06:59 at epicenter (17m ago,… https://t.co/NxX1xfeyWj — Earthquakes Tsunamis (@NewEarthquake) January 21, 2016

A tsunami is not expected, the USGS said.

Tomatlan is located about 100 kilometres south of the resort town of Puerto Vallarta.

Se activaron los protocolos de respuesta ante #Sismo en #Jalisco, al momento no se reportan afectaciones — Luis Felipe Puente (@LUISFELIPE_P) January 21, 2016

Mexico’s national coordinator of civil protection tweeted that no damage has been reported.

Mexico is among the world’s most active regions for earthquakes.

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