The earthquake swarm began in February 2008, but the first significant quake of the series occurred on April 15, 2008, registering a 3.6 magnitude.
On April 25, 2008, the quake of largest magnitude occurred, registering 4.7 on the Richter scale and causing damage in the immediate area around the epicenter, including destroying 200 feet (61 m) of a wooden flume supplying water from the Highland Ditch, also known as the Highland Ditch flume.
In addition to these significant quakes, hundreds of smaller events have also occurred in the same area.
The United States Geological Survey (USGS) estimates that over 620 earthquakes have occurred in the general three mile vicinity since the swarm has been monitored.
Seismologists with the USGS as well as the Nevada Seismological Laboratory expressed concern that the increasing magnitude of the felt quakes may indicate that a larger earthquake was imminent.