Mild earthquake reported in southern Davidson County

The star in the upper left quadrant of this map shows the center of an earthquake reported Nov. 15, 2015, in southern Davidson Co., N.C. (USGS image)

The star in the upper left quadrant of this map shows the center of an earthquake reported Nov. 15, 2015, in southern Davidson Co., N.C. (USGS image)

The United States Geological Survey (USGS) confirmed that a magnitude 2.6 earthquake was recorded in southern Davidson Co., N.C. The quake occurred at 4:41 a.m. EST, Sun., Nov. 15, 2015, and was centered near the intersection of N.C. Hwy. 49 and N.C. Hwy. 109, about six miles south of Denton and 14 miles north-northeast of Albemarle.

Through social media and broadcast reports, local residents reported hearing a rumble and feeling the vibration of the tremor.

Click here to see details from the USGS Earthquake Hazards Program.

Background information from the USGS:

Earthquakes in the Inland Carolinas Region

Since at least 1776, people living inland in North and South Carolina, and in adjacent parts of Georgia and Tennessee, have felt small earthquakes and suffered damage from infrequent larger ones. The largest earthquake in the area (magnitude 5.1) occurred in 1916. Moderately damaging earthquakes strike the inland Carolinas every few decades, and smaller earthquakes are felt about once each year or two.

Earthquakes in the central and eastern U.S., although less frequent than in the western U.S., are typically felt over a much broader region. East of the Rockies, an earthquake can be felt over an area as much as ten times larger than a similar magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake typically can be felt at many places as far as 100 km (60 mi) from where it occurred, and it infrequently causes damage near its source. A magnitude 5.5 eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where it occurred, and sometimes causes damage as far away as 40 km (25 mi).

Faults

Earthquakes everywhere occur on faults within bedrock, usually miles deep. Most bedrock beneath the inland Carolinas was assembled as continents collided to form a supercontinent about 500-300 million years ago, raising the Appalachian Mountains. Most of the rest of the bedrock formed when the supercontinent rifted apart about 200 million years ago to form what are now the northeastern U.S., the Atlantic Ocean, and Europe.

At well-studied plate boundaries like the San Andreas fault system in California, often scientists can determine the name of the specific fault that is responsible for an earthquake. In contrast, east of the Rocky Mountains this is rarely the case. The inland Carolinas region is far from the nearest plate boundaries, which are in the center of the Atlantic Ocean and in the Caribbean Sea. The region is laced with known faults but numerous smaller or deeply buried faults remain undetected. Even the known faults are poorly located at earthquake depths. Accordingly, few, if any, earthquakes in the inland Carolinas can be linked to named faults. It is difficult to determine if a known fault is still active and could slip and cause an earthquake. As in most other areas east of the Rockies, the best guide to earthquake hazards in the seismic zone is the earthquakes themselves.

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