Map: A 5.9 magnitude earthquake strikes northwest China

A fairly strong 5.9 magnitude earthquake struck northwest China on Monday, according to the US Geological Survey.

Agency data showed that the earthquake occurred at 11:59 pm China time.

As seismologists review available data, they may revise the magnitude of the reported earthquake. Additional information collected about the quake may also prompt USGS scientists to update the tremor intensity map.

Aftershocks in the area

An aftershock is usually a smaller earthquake that follows a larger earthquake in the same general area. Aftershocks are usually minor adjustments along a portion of a fault that slipped at the time of the initial earthquake.

Earthquakes and aftershocks within 100 miles

Aftershocks can occur days, weeks, or even years after the first earthquake. These events can be equal to or larger in magnitude than the initial earthquake, and can continue to affect already damaged locations.

Source: United States Geological Survey | Notes: Vibration classes depend on Modified Mercalli density size. When aftershock data is available, the corresponding maps and graphs include earthquakes occurring within 100 miles and seven days of the initial quake. All times listed above are China time. Vibration data as of Monday, December 18 at 12:15 PM ET. Aftershock data as of Monday, December 18 at 5:43 PM ET.

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