Another earthquake swarm hits Mount Hood stratovolcano in Oregon

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earthquake swarm mount hood january 2021, earthquake swarm mount hood january 2021 map, earthquake swarm mount hood january 2021 news, earthquake swarm mount hood january 2021 update
Earthquake swarm hits Mount Hood stratovolcano in Oregon from Jan.17-20.

On Sunday afternoon, January 17, 2021, a swarm of small earthquakes started rattling the south side of Mount Hood with several dozen small quakes happening withing a few hours.

The swarm has yet slowed down and stopped on January 20, 2021. 

earthquake swarm mount hood january 2021, earthquake swarm mount hood january 2021 map, earthquake swarm mount hood january 2021 news, earthquake swarm mount hood january 2021 update
About 45 earthquakes struck near Mt. Hood within a few hours. The swarm lasted unti January 20, 2021.

The figure below summarizes the timeline of earthquakes that occurred off-summit (i.e. not centered under the volcano, but within 2.5 km of it).

During the time period in the figure (1980-2017), occasional earthquakes have occurred beneath the summit as well, but most of the seismic action in recent decades has taken place in swarms near or on faults close to the volcano.

earthquake swarm mount hood january 2021, earthquake swarm mount hood january 2021 map, earthquake swarm mount hood january 2021 news, earthquake swarm mount hood january 2021 update
Is this January 2021 earthquake swarm at Mt. Hood actually normal? Graph shows timeline of earthquakes that occurred off-summit. Picture: USGS

Today’s swarm is also located close to the Twin Lakes Fault. But this is not the only fault around the volcano. Back in 2019 a new dangerous seismic line was discovered in the vicinity of the stratovolcano in Oregon.

CVO recently installed three more seismic stations near Mt. Hood that we can now use to better constrain exactly where these small earthquakes occur.

The figure below is a screenshot on one of Jan 17th little earthquakes on recordings from the three new stations.

Each station measures the shaking in three directions, up-down (Z), north-south (N), and east-west (E).

Picks on new CVO stations near Mount Hood, Jan 17 2021

Scientists at the Cascades Volcano Observatory (CVO) aren’t too worried about an impending volcanic eruption because similar swarms of small tectonic, not volcanic, earthquakes have happened in the past in this area.

By the way you can download a new documentary film about Cascadia Below… It’s really worth your money! (click on the picture below).

Of course, if the volcano ever does wake up and causes a different kind of seismicity, these new stations will help us detect that as well! More earthquake news on Strange Sounds and Steve Quayle. [PNSN]

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4 COMMENTS

  1. MT.HOOD will be spectacular,AMERICAS DADDY..THE SON OF PERDITION…STOLE 350 NUCLEAR WEAPONS FROM THE US AIR FORCE,and HE never gave them back,BUT he did put FOUR OF THEM ON MT.HOODS CALDARA,it should be a sight to see when he sets them off,OH and all the other west coast mountains too…OBAMA planted them all over america..IT’LL be like the fourth of JULY…

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