A magnitude 3.5 earthquake struck 34 km southeast of Mexicali on Monday, per volcanodiscovery.com.
The USGS reports a second light quake, magnitude 3.2, 37 km west of San Luis Rio Colorado, also on Monday morning.
Residents were reportedly shaken awake by the tremors in the early hours, though no injuries or damage have been reported yet.
The region remains under monitoring for aftershocks as officials assess potential impacts from the seismic activity.