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The earthquake swarm continues in Yellowstone.  The strongest earthquake has been upgraded to a magnatude 3.9.  There have now been over 70 earthquakes in the region in the past 48 hours.

Earthquake Activity

Prior to the initial event the seismograms showed normal activity. The preceding event shown on the chart above has a very unusual pattern. It may be a glitch, but it was followed by increased activity. Current activity is shown in the last section.

Initial Event Captured on Another Seismogram

Current Seismogram

Earthquake swarms often precede volcanic eruptions as the magma stresses the outer crust.  They may also indicate subsidence, relief of pressure on the crust.

Earthquake Swarms and Volcanoes

The movement over the last four years seems to indicate an increase in stress.

Current Activity
Current Seismogram
The Looming Threat of Yellowstone
Earthquake Swarm Strikes Yellowstone
Scientists watch unusual Yellowstone quake swarm

Ranging in size from a magnatude 2.1 to 3.8, over 20 quakes have hit the Yellowstone region in the past 2 days.  These quakes are occurring beneath Yellowstone Lake.

Earthquake List | USGS Map

Yellowstone Lake

The Yellowstone caldera continues to swell. The dramatic chart below shows the increase in movement in the Yellowstone caldera since the beginning of 2004.

Yellowstone Movement

Looming Threat of Yellowstone

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