4/18/2016 — Earthquake swarm breaks out near Yellowstone / Hebgen Lake

A noteworthy earthquake swarm has broken out near Yellowstone Supervolcano, specifically near Hebgen Lake.

yellowstone earthquake swarm april 18 2016


Hebgen lake is the location of the largest earthquake to strike the Intermountain West in recorded history, with a M7.5 showing up in 1959.

earthquake hebgen april 18 2016

The swarm is being caused by pressure coming from the West coast.  No doubt the pressure is building off the coast, now pushing the craton edge to the East, causing a swarm at Yellowstone as a result of the pressure.


Information on this earthquake swarm from the USGS: (largest event so far is a M3.2)

Magnitude/uncertainty 3.2 ml± 0.2
Location/uncertainty 45.038°N 111.866°W± 0.3 km
Depth/uncertainty 2.0 km± 1.8
Origin Time
Number of Stations 59
Number of Phases 60
Minimum Distance 25.7 km (0.23°)
Travel Time Residual 0.3 s
Azimuthal Gap 49°