OKLAHOMA CITY — Mary Catherine Sexton has been rattled enough.

This fall her neighborhood in the northeastern part of this city has been shaken by dozens of minor earthquakes. “We would just have little trembles all the time,” she said.

Even before a magnitude 4.5 quake on Saturday knocked objects off her walls and a stone from above her neighbor’s bay window, Ms. Sexton was on edge.

“People are fed up with the earthquakes,” she said. “Our kids are scared. We’re scared.”

Oklahoma has never been known as earthquake country, with a yearly average of about 50 tremors, almost all of them minor. But in the past three years, the state has had thousands of quakes. This year has been the most active, with more than 2,600 so far, including 87 last week.