I’ve lived in earthquake zones all my life, and even been in many quakes. My son lives close to the New Madrid fault, and while he was here, there was a small quake in AR.
Pets are often more aware of shifts than we are, but that doesn’t necessarily mean they can tell you an earthquake is imminent. Still, don’t ignore them completely.
A high level of electromagnetism, or something, flowing through everything.
Like Marty said to Doc: "This is Heavy!"