Aftershocks continue after S. Arizona earthquake

DUNCAN, AZ - Did you feel that? It might have been an aftershock from the late June earthquake near Duncan, Arizona.

There have been more than a dozen aftershocks of about 3.0-magnitude since the main 5.2-magnitude quake rattled the area.

The Arizona Geological Survey says that all of these earthquake events have been about 3 miles below the surface, so they have all been on the more shallow side of average.

Since Thursday, five temblors have been reported, the largest being 3.6-magnitude shakes on Thursday afternoon and Friday morning.

Hundreds of aftershocks below 3.0-magnitude have been recorded in the area, but most of them are not felt, AZGS says.

For an interactive map, click here .

Due to the recent amount of seismic activity in the area, five portable seismometers have been placed in the region in hopes of learning more about what's going on underground.

According to Jon Spencer, Senior Geologist at AZGS, "The recent Duncan earthquake occurred because Earth's crust in southern Arizona and northern Sonora is gradually extending in an east-west direction."

The largest earthquake in the area occurred in May 1887 and was recorded as a 7.5-magnitude event.

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