The current earthquake swarm began on June 12. A week later, the USGS put out a statement to say that 464 earthquakes had been recorded, with the largest being magnitude 4.4. This is the highest number of earthquakes at Yellowstone within a single week in the past five years.
At the time, a spokesperson for the USGS said “slowly winding down,” adding that “no other geological activity has been detected.” However, in a newly released statement about the ongoing swarm, seismologists from the University of Utah said 878 events have now been recorded at Yellowstone National Park.
The United States Geological Survey reports that more than two dozen earthquakes rattled the Lake Tahoe region early Tuesday. The largest earthquake measured a magnitude 4.0 shortly after 2 a.m. at a shallow depth. The earthquake was reported 11 miles (17 kilometers) from Truckee. Preliminary earthquake information shows that at least 28 minor aftershocks occurred in the area, ranging in magnitude from 0.6. to 3.2 following the 3.9 magnitude shaker.
An earthquake swarm has started last night 230 km north off Iceland, with more than 50 small tremors and two earthquakes larger than M4.0 on the Richter scale. Oficials say there are no sings of an eruption and that the series seems to be linked to the movement of the American and the Eurasian tectonic plates.