BEN FERRAIUOLO
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Seismo-Blog

Low-Frequency Event near Mary Lake, Yellowstone??? 2018/09/03

9/3/2018

2 Comments

 
Picture
The seismogram and spectrogram plot above shows a possible low frequency event that occurred somewhere near seismic station YML, Mary Lake from 9:29UTC to 9:32UTC September 3, 2018. The first event, right before the low frequency earthquake, does not appear to be an actual earthquake. I at first thought that this "tremor" looked like wind, and it actually resembles wind in many ways. However wind cannot send a specific signal over miles and miles. Don't know what I mean? Please continue by pressing "read more".
Picture
Distance from YML to B950: about 8.25 miles.
Picture
Above is Google Earth, showing the distance from YML to B950 is about 8.25 miles. Why is that important? Well this one unknown "tremor" event, that occurred before the low frequency earthquake, appeared on only two seismic stations within the entire WY network: YML and B950. I first thought it was surface noise, but then I noticed the travel time from YML to B950 and the P wave arrivals conclude this was an actual seismic event. Of course it was not major, only maxing out at about 2,000 amplitude count. It also did not carry the characteristics required to label it "harmonic tremor". However it does appear to be a tremor of some sort, carrying a mid-range frequency.
Picture
Another view of the "tremor" that took place just prior to the low frequency earthquake. Notice it peaks at about 15HZ? Very odd!
Picture
Picture
The two images above, which have no caption, are of the low frequency earthquake that occurred right after the strange "tremor" event. You can tell this can most likely be categorized as a low frequency earthquake. Notice it barely exceeds 15HZ and appears to have dominant frequencies around 5-10HZ? In retrospect, most high frequency tectonic earthquakes can exceed 25HZ, even at small magnitudes!
Picture
Picture
The two images directly above show one other earthquake that occurred just a minute or so after the low frequency earthquake. I attempted to locate the P wave (always marked with a black line on WAVES) on YML and B950 to prove this was also not surface noise. If the weird "tremor" event that occurred before the LF quake, and this earthquake shown in the two images directly above, were surface noise then it would not travel from YML to B950 in 2-3 seconds. 2-3 seconds is about the travel time it would take for seismic waves to reach B950, if generated from near Mary Lake.

Now how do we know the odd "tremor" event in the beginning is not just a teleseism? Well usually a teleseism would, 1. carry a lower frequency, and 2. appear on MCID. Seismic station MCID, Moose Creek, Idaho, resides just on the southwestern tip of Yellowstone national park. It is one of the best seismic stations at Yellowstone for detecting teleseisms (global distant earthquakes usually magnitudes 5.5 and above). But even so, let's check MCID and compare it to YML to see if it was a teleseism:
Picture
For this one image: YML (top webicorder) and MCID (bottom webicorder) are both set to the same time frame and period. If it were a teleseism, the seismic signals would have appeared on both seismic stations around the same time.
Picture
Here in the WAVES seismic program, I have B950 (top), MCID (middle), and YML (bottom) all lined up for the same time period. You can see both the odd "tremor" and the LF quake appear on B950 and YML however it does not appear on MCID, where it should appear if it were a teleseism.
So I was very intrigued by this one little event. This event most likely took place about a couple miles deep just a few miles from YML. YML, Mary Lake, showed the strongest amplitude count and the P/S waves arrived at this station first. Interesting, huh? If anything else develops, you will be the first to know! God bless!
Picture
2 Comments
John
9/5/2018 04:29:40 am

Hello Ben,

you did another amazing video today, showing us all, what there should be standard. Thak you for all your work and good luck.
Knowing you follow Mary G. as well, what about the 'new vents next to boardwalks'? Any mor informations? What about the alert level, is it time to rise?

Thank you

XX

Reply
Ben
9/5/2018 02:20:29 pm

Well I don't think the alert level should be raised... Yet. And I don't follow Mary as much as I used to. We differed too much in our views and she didnt like me trying to help her understand certain things. I am just an independent guy now. In regards to Yellowstone, swarms directly above the magma chamber are more concerning than the swarms that occur farther away. Of course all swarms are concerning, and they should be, but swarms occurred at Yellowstone Lake and West Thumb need to be watched closely. I do think uplift is starting again and if so more swarms could be on the way. Keep an eye out! Thank you and God bless!

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    Ben Ferraiuolo is a fast learner and someone who will always stand for the truth. Visit "About Me" for more!

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  • Home
  • Yellowstone
    • Yellowstone Blog
    • 2008-2009 Yellowstone Lake Dike Intrusion
    • Rapid-Fire Swarms 2014-2018
    • Steamboat Geyser Eruptions >
      • Steamboat Eruptions 2020
      • Steamboat Eruptions 2019
      • Steamboat Eruptions 2018
  • Hawaii
    • Hawaii Blog
    • Hawaii Spasmodic Tremor
    • 2018 Kilauea-LERZ Eruptions
  • How To...
    • ...Retrieve Seismic Data
    • ...read webicorders/helicorders and seismic plots
    • ...Understand Spectrograms
    • ...USE SWARM Software
    • ...use jamaseis program
    • ...use waves program
    • ...understand UTC
    • ...Read/Create GPS Deformation Charts
    • ...use s.w.a.r.m. program (OLD)
  • Seismic Events
    • Event Examples
    • Exotic Events
    • Whale Calls
    • Cascade Volcanoes' Low Frequency Events
  • Seismo-Blog
  • Other Seismic Blogs
    • Quake Swarms
    • United States
    • East Coast, USA
    • World
  • Monthly Volcano Updates
  • Uplift/Subsidence Update
  • Videos/Multimedia
    • Newberry Videos
    • (OLD) 2019 Monthly/Yearly Updates
  • Seismic Software
    • jAmaSeis
    • SWARM
    • WAVES
  • Seismic Network Help
  • Links
  • About Me
  • Contact
  • Test Your Knowledge!
  • Lucas Andrew Ferraiuolo (Pro Pics)
  • Garbage Trucks?!