Ground oscillations are registered by seismographs. Very sensitive people being at complete rest can feel an earthquake. Weak sound of densely made unstable glass is heard. Most of the people being inside buildings feel an earthquake. In rare cases people awake.
Some people can feel an earthquake in the open air.
In rare cases clock pendulums stop to swing. Sometimes a liquid pour out of filled vessels. Shelved unstable glass and ceramics overturn. All the people being inside buildings and most of the people in the open air feel an earthquake. People awake and domestic animals become worried.