Residents in southern Arizona experienced an unusual morning wake-up call this Wednesday. According to FOX 10 Phoenix, a 4.6 magnitude earthquake originating from south of Mexicali in Baja California, Mexico, was felt in parts of southwestern Arizona. The US Geological Survey (USGS) reported that the tremors occurred just before 5 a.m. on June 5.

While no damage or injuries have been reported, individuals near Yuma are said to have felt the shake, and some reports suggest tremors were felt as far north as Quartzsite. With an earthquake hitting northern Mexico in May that had similar effects on the region, this recent seismic activity is not entirely unprecedented. Residents who experienced the quake can submit their reports to the USGS, contributing to the researchers’ understanding of the event.

The USGS classifies a 4.6 magnitude earthquake as a minor event that can be felt and sometimes cause minor damage. In the context of the Richter scale, which measures earthquake magnitude, each increment represents a tenfold increase in the quake's size or amplitude. 12 News notes that a moderate earthquake is considered to be a 5.3 magnitude, and a strong earthquake measures at a 6.3 or higher.