Categorized | Earthquake, News

6.2M earthquake offshore Mexico, no tsunami advisory issued for Hawaii

Magnitude
6.2
Date-Time
Saturday, January 21, 2012 at 18:47:15 UTC
Saturday, January 21, 2012 at 12:47:15 PM at epicenter
Saturday, January 21, 2012 at 8:47:15 AM HST
Location
14.959°N, 93.107°W
Depth
66.1 km (41.1 miles)
Region
OFFSHORE CHIAPAS, MEXICO
Distances
57 km (35 miles) SSW (203°) from Mapastepec, Chiapas, Mexico
72 km (44 miles) WSW (253°) from Huixtla, Chiapas, Mexico
82 km (51 miles) S (172°) from Pijijiapan, Chiapas, Mexico
89 km (55 miles) W (274°) from Tapachula, Chiapas, Mexico
281 km (174 miles) W (278°) from GUATEMALA CITY, Guatemala

USGS: How large does an earthquake have to be to cause a tsunami?

Magnitudes below 6.5
Earthquakes of this magnitude are very unlikely to trigger a tsunami.

Magnitudes between 6.5 and 7.5
Earthquakes of this size do not usually produce destructive tsunamis. However, small sea level changes may be observed in the vicinity of the epicenter. Tsunamis capable of producing damage or casualties are rare in this magnitude range but have occurred due to secondary effects such as landslides or submarine slumps.

Magnitudes between 7.6 and 7.8
Earthquakes of this size may produce destructive tsunamis especially near the epicenter; at greater distances small sea level changes may be observed. Tsunamis capable of producing damage at great distances are rare in the magnitude range.

Magnitude 7.9 and greater
Destructive local tsunamis are possible near the epicenter, and significant sea level changes and damage may occur in a broader region.

Note that with a magnitude 9.0 earthquake, the probability of an aftershock with a magnitude exceeding 7.5 is not negligible. To date, the largest aftershock recorded has been magnitude 7.1 that did not produce a damaging tsunami.

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