Key Highlights
- People logged "Did You Feel It?" reports, describing weak shaking but no widespread disruption or harm. Such low-intensity quakes—between 2.5 and 5.4 on the moment magnitude scale—often register human senses without structural fallout, per Michigan Tech seismologists.
- California's San Andreas and local faults fuel frequent activity, placing the state among top US hotspots alongside Alaska and Hawaii.
- No immediate aftershocks were reported, though USGS monitors closely. Residents in Colton, Riverside, and Colton areas felt the rumble, prompting safety reminders.
- Experts stress the "drop, cover, and hold on" drill: crouch under sturdy tables, shield head and neck, grip tight for movement. Why Is California A High-Risk Zone?Fontana's position near active faults amplifies felt reports.
- USGS DYFI data confirms light effects, easing panic.
