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Yellowstone Volcano Observatory Monthly Update: November 1, 2019

[Music] hi everybody I'm Mike Pollan the scientists in charge at the Yellowstone Volcano Observatory and I'm here with the update for November 1st of 2019 I thought before we dove into the discussion about the earthquakes in the ground deformation we could talk a bit about steamboat since of course the eruptions there are continuing and I wanted to show you the temperature record in the steamboat outflow channel this is a thermometer basically that's stuck in the channel that's draining steamboat so whenever there are eruptions the water will pass over this thermometer and then the day did it get radioed in and we can record it and actually show it in real time on the yvl website to go to the to the monitoring page so there are five water eruptions of steamboat geyser during the month of October you can see them all right here in this plot this is showing the temperature over the entire month so here's an eruption on October first then you can see right after that eruption the temperature went down and then we were seeing kind of the daily temperature variations of just air temperature and then all of this sort of wiggling up and down our minor eruptions so basically the guys are starting to heat up small eruptions are occurring and then we get another eruption there on October 7th immediately goes right back down to just air temperature then it starts up again minor eruptions until another one on October 16th again on October 22nd and then on October 30th so we had these five water eruptions but each one was preceded by up to a couple of days of this minor eruptive activity and that's something that's pretty characteristic of Steamboat and it's kind of neat as well to see that sometimes the miners only last for a couple days sometimes they last for many days and there isn't a real pattern in just how long that minor activity occurs before the big major eruption happens so you can go online and you can see this on our web site anytime it's updated daily so you can keep track of steamboat eruptions even when there's no one there and unfortunately that's going to happen because winter conditions are coming to Yellowstone and park roads are going to close on November 4th but we'll still keep this updated all right well let's dive in and have a look at the data for the month of October during the month of October the University of Utah seismograph stations which is responsible for the operation and analysis of the Yellowstone seismic Network located 193 earthquakes in the yellowstone national park region the largest event was a magnitude two point nine located right here on october 16th at about 11 a.

m.

mountain time sort of between Mammoth Hot Springs and the mount washburn area in addition to all the normal sized masti that was scattered throughout the region there were two seismic swarms during the month the first occurred right here it was just on the western boundary the park it included 39 earthquakes the largest of which was just a magnitude two point one and it occurred in October 4th lasting through October 12th a largest warm was south of the Mammoth Hot Springs area included 87 earthquakes between October 26th and October 31st the largest magnitude earthquake in this swarm was a magnitude 2.

6 these sorts of swarms are pretty common in the Yellowstone region throughout the year and they account for roughly 50% of all the seismicity in the region rather like this month where they account for about half of all earthquakes that were located during October in terms of deformation we didn't see a whole lot of big changes at Yellowstone over the last month or so this is vertical deformation at the White Lake GPS station downward trends mean subsidence and upward trends mean uplift so over the last two years you can see this trend of subsidence dominates over the last two months the deformation has been somewhat variable with subsidence and then possibly a slight bit of uplift but the net deformation has basically been zero over the last couple of months looking at the mallet lake resurgent dome this is represented by a GPS station that's located at Old Faithful you see the same general trend of subsidence over the last two years over the last two months there was a bit of subsidence and then that sort of bottom doubt in October so there hasn't been much net deformation recently perhaps more interestingly is at Norris Norris had been uplifting since 2015 and in October or so of 2018 that stopped and you can see how basically there wasn't much deformation at Norris up until about September October of this year when Nora started to subside so we're starting to see looks like the onset of substance in the Norris region want to keep an eye and see how that progresses over the coming winter finally if you'd like more information you can always go to the Yellowstone Volcano Observatory website you can find our monthly updates there you can also go and look at Yellowstone six specific information the current alerts background information on geology and history hazards all of our monitoring data are accessible via the monitoring tab and our weekly caldera chronicles article you can always access right here now remember if you have any questions you can always reach out to us via email at yv o web team all one word at usgs govt we're always happy to answer whatever questions you might have well that does it for the November update I hope you have a great month and we will see you again in December take care [Music].

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