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A light magnitude 4.7 earthquake struck 11km SW of Alberto Oviedo Mota, B.C., Mexico on Saturday, December 11, 2010 at 12:52:26 PM UTC. This shallow crustal event (13.0 km depth) released energy equivalent to approximately 175 tons of TNT. Here is the verified CI telemetry, live epicenter map, and ground shaking assessment.
(11km SW of)4.7MW
Light Seismic Class
13.0km
Crustal Layer
32.163° N, 115.264° W
GPS Coordinates
175 tons
TNT Equivalent Power
CI
USGS Real-time Feed
A magnitude 4.7 event is classified as a light earthquake. Noticeable shaking of indoor objects and rattling doors/windows. Generally causes none to slight non-structural damage in older buildings.
Felt by all. Glassware broken, books knocked off shelves, minor plaster cracks.
Felt only by a few persons at rest, especially on upper floors.
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Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Because seismic scales are logarithmic, each whole integer increase represents:
Southern and central Mexico lies directly above the Middle America Trench, where the oceanic Cocos and Rivera plates subduct beneath the North American Plate. This active subduction margin produces frequent intermediate and megathrust seismic events.
Originating at a depth of 13.0 km (Earth's Crust (0–70 km)), this rupture occurred occurred within the brittle upper crust. shallow earthquakes produce the highest peak ground acceleration and the sharpest surface shaking.
Seismologists note that minor aftershocks remain common in the 24 to 48 hours following tremors of magnitude 4.7. According to statistical seismic models, there is roughly a 5% probability of a subsequent event of equal or greater strength occurring in the same fault zone. Residents in Mexico are advised to check living spaces for unsecured items.
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