The 45-minute-long swarm of dozens of quakes occurred at 12:13 p.m PT, although the seismic exercise was reportedly too weak to be felt close to the floor.
“The Pacific Northwest Seismic Community positioned eight occasions thus far with a most magnitude of M 1.3; dozens of different occasions have been too small to find. These earthquakes have been too small to have been felt on the floor,” the geologists defined in a Fb submit.
It additionally highlighted that “short-lived swarms” have been recorded close to Mount Hood up to now, together with November of 2013, September and October of 2014 and Might of 2016.
“Burst-like swarms of small earthquakes like this are thought of to be part of Mount Hood’s background seismicity,” the company wrote. “Such bursts of earthquakes are seen at many volcanoes world wide and within the Cascades, together with at Mount Rainier, Mount St. Helens, and Lassen Peak (California), and are generally interpreted to be attributable to the motion of hydrothermal fluids (water).”
The USGS assured that whereas the seismicity “represents a brief uptick in exercise, Mount Hood stays at regular, background ranges.”
Replying to a remark, they mentioned that what that they had witnessed within the case of volcano tectonic earthquakes is a “slip on a fault or faults” and that’s simply achieved by pushing “somewhat water in there and [jacking] the fault aside simply sufficient to induce slip.”
Magma, nevertheless, is extra viscous and fewer in a position to penetrate any weak point in pre-existing rock, the company added.
Mount Hood, a stratovolcano, has erupted episodically for about 500,000 years which two main eruptive intervals through the previous 1,500 years.
Within the mid-1800s, residents reported minor explosive exercise, however Mount Hood has remained dormant since then.
That mentioned, on Jan. 17, 100 delicate quakes have been recorded south of the summit.