Earthquake swarm is near the middle of the caldera.
Yellowstone Earthquake Swarm Puzzles Scientists. By LiveScience Staff
The earthquake swarm begin Dec. 27. The strongest quake has been a 3.9 quake. That could do some minor damage, but the big question is “does it mean anything?” Most questions are about an eruption. This isn’t likely, but changes in the Park’s thermal features are often observed after quake swarms and some big distant quakes. These changes are often not noticed until the snow melts. Geyser watchers will be very curious to see the outcome.
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The earthquake swarm continued into Jan. 2. There have been a lot of quakes, including three, 3+ quakes Jan. 2. The strongest today was a 3.5 quake. The quakes are shallow. To me that means related to the magma pool just under the Park.
Jan. 3. Fewer quakes! Has the earthquake swarm ended or just paused?
Jan. 4. Few quakes –6 very small quakes.
Jan. 5. Just 2 small quakes.
Jan. 6. Two more small quakes”
Jan. 7. No quakes
Jan. 8. No quakes
Jan. 9. Eleven quakes, including a 3.3 (restart?)
Jan. 10 No quakes by noon
Link for data http://www.seis.utah.edu/