A look at the specifics of southern AZ's earthquake - Tucson News Now

A look at the specifics of southern AZ's earthquake

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Source: Arizona Geological Survey Source: Arizona Geological Survey
Source: Arizona Geological Survey Source: Arizona Geological Survey
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TUCSON, AZ (Tucson News Now) -

There were no reports of significant injury or damages following Saturday night's magnitude 5.2 earthquake in southern Arizona.

The quake hit just before 10:00 p.m. near Duncan, Ariz. Preliminary analysis from the Arizona Integrated Seismic Network shows that the major earthquake was part of a series of a about a dozen earthquakes that night.

The foreshock is thought to have occurred just before 6:00 p.m. Saturday and was a magnitude 3.0.

The main earthquake last night was followed by at least nine aftershocks, four of which were magnitude 3.0 or greater. The first aftershock occurred at 10:22 p.m. and was a 3.5 M quake. The last measurable earthquake was a 3.3M earthquake that occurred at 8:40 a.m. Sunday.

Other aftershocks probably occurred but not at a level measurable by seismometers.

The earthquakes made a NW-SE trend extending out five miles. No events occurred deeper than six miles.

Small magnitude aftershocks are likely to continue for days to weeks in the area of Duncan, but most will probably go unfelt. A larger earthquake could possibly occur in the near future, though the likelihood of an earthquake like the one felt last night occurring in the next 25 years is only 20 percent.

In May 1887, southeastern Arizona experienced it's largest earthquake in history, a magnitude 7.5 earthquake. The event originated on the Pitaycachi fault in northern Sonora, Mexico—which is about 25 miles south of Douglas, Ariz.

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