Caldera Records: An earthquake swarm lies beneath Yellowstone Lake | Untamed Montana

The 2008 swarm noted that earthquakes slowly migrated northward over time at about one kilometer per day. Additionally, a surface deformation was recorded at nearby GPS stations where the swarm migrated.

The migratory swarm associated with surface distortion indicates fluid movement through the shallow crust. When the pressurized fluid moves through the crust, it breaks down the rocks and removes them, causing earthquakes and surface deformation. It is difficult to know exactly what liquids are moving (water, gas, magma, etc.) due to the small amount of total deformation. It remains the only time GPS stations in Yellowstone have recorded an anomaly associated with an active earthquake swarm.

In comparison, the current swarm is much weaker in terms of the total number of events and the energy it fired – known as the seismic moment. Unlike the 2008 swarm, earthquakes in this current swarm do not appear to migrate over time.

However, an interesting aspect of this swarm is that it occurs directly on the boundary of the Yellowstone Caldera – a rift that formed as a result of surface collapse during the last great volcanic eruption 631,000 years ago.

Could this swarm be a reactivation of this border error? Only more research will be able to address this question, but swarms on the faults of the caldera ocean are relatively common. For example, earlier this year, on September 10, another swarm occurred with about 100 earthquakes identified within 24 hours (the largest was 2.8 magnitude).

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