Effective they think the system really is. Just before 9 30 this morning, an earthquake with a magnitude of 4. 1 hit about 2. 5 miles southwest of the city of isleton, triggering an Emergency Alert notification from the usgs shake system. But it was felt by many neighbors in antioch, like melanie. My kitchen light started shaking. Then, the counter started shaking, and i just kind of braced myself a little bit. Reporter the mother of two says a second later, her phone went off. My phone alerted, the national alert, which was a surprise, because we had never got earthquake alerts before. Reporter she says thankfully there was not any damage inside or outside of her home. But she feels like the alert made her panic. I have mixed feelings about it, because i feel like it kind of brought on some extra panic that was not really necessary. Because of that, i was waiting, expecting something bigger. When you feel the shaking, where are you supposed to go . Reporter are for her fouryearold son