1.   In the silence the noise sounded like a small earthquake but he paid no attention to it.

2.   Small earthquakes occur continually but relieve only a negligible portion of the accumulated strain energy.

3.   The town experiences dozens of small earthquakes every year.

4.   Unfortunately, foreshocks are just like any other small earthquake.

5.   But for reasons that are not well understood, these small earthquakes sometimes do not stop.

6.   By California standards, it was a small earthquake.

7.   Daily temperature shifts, storms and small earthquakes can cause buildings to sway, knocking the laser beam out of kilter.

8.   Even today, experts warn, it may not be easy to distinguish secret nuclear blasts from false alarms such as small earthquakes, mine explosions, exploding meteors.

9.   In regions of weak rock, small earthquakes occur frequently.

10.   Small earthquakes are occurring regularly in the region, although most are too small to be felt.