Sunday around 6:44 a.m., a 3.8 magnitude earthquake shook the ground 31 miles outside of Chico — which was followed by a smaller 3.2 magnitude tremor south of Gilroy at 11:05 a.m. this morning.

According to the United States Geological Survey (USGS), a pair of notable earthquakes rattled parts of NorCal Sunday, each of the quakes happening before noon. Though comparatively small and quite common — earthquakes that register between 2.5 and 4.5 on the Richter scale number annually some 30,000 across the world — these like-magnitude earthquakes are capable of being felt tens of miles away and can cause slight damage.

Sunday's larger earthquake in NorCal was detected around 9 miles east of Willows, a small city an hour north of Sacramento. The USGS's "ShakeMap" shows "light" vibrations from the earthquake's epicenter radiated over fifty miles in each direction — making the tremor capable of being felt by Yuba City residents over fifty miles away.

The less sizable, more local quake originated 2 miles west of San Juan Bautista, 14 miles outside Gilroy; the tremor was only strong enough to produce "weak" vibrations that were noticeable about 30 miles in either direction of its epicenter.

Both earthquakes produced no damage but added to a year of increased geological activity in California — particularly along otherwise sleepy fault lines that have become more lively as of late.

Related: Earthquake Early Warning System Launches 13 Years After Project Began

Did You Feel It? Another Small Earthquake Shakes SF, This One 4.5M

Many Bay Area Hospitals at Risk of Earthquake Collapse, 12 Years Past Retrofit Deadline

Image: Example of seismometer printing. (Courtesy of Getty Images via kickers)