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EARTHQUAKE SWARMS

Quaking Yellowstone Thermal Features & Earthquakes Earthquake Swarms Hebgen Lake Quake Quake Effects

It is not unusual for there to be between 1 and 20 earthquakes in Yellowstone every day. However, sometimes the quakes occur in swarms, meaning there are many quakes that take place during a brief span of time within the same area.

In April 2004, 400 earthquakes were recorded over a 3 day period! Scientists think these swarms may be caused by shifts in the underlying magma or by movement of hot water and gases beneath the ground.

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