BEN FERRAIUOLO
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Seismo-Blog

M6.8 Greece and M2.9 Montana Earthquakes 10/25/18

10/26/2018

4 Comments

 
Picture
At 4:54PM Mountain Time October 25, 2018 (22:54UTC October 25, 2018) a very large M6.8 earthquake struck off the southern coast of Greece. It was very shallow for an earthquake of this magnitude so it really shook up Greece! This area is seismically active and does have large earthquakes from time to time. The largest was apparently a 7.3 on October 6, 1947. However what is interesting with this earthquake is that there was a smaller foreshock just before the 6.8. Also, about 3 hours later, a magnitude 2.9 earthquake struck Montana just about 20 miles northwest of Bozeman. I will show the helicorders first and then the seismogram/spectrogram plots for these different events. PLEASE CLICK THE TITLE OF THIS POST OR "READ MORE" TO CONTINUE!!!

M6.8 in Greece:

Hey guys! So first I am going to talk about the M6.8 earthquake that struck Greece and then I will move on to the M2.9 quake in Montana. On October 25, 2018 at 22:54UTC a very large M6.8 earthquake struck off the coast of Greece. As you will see in the image below, you can see the earthquake was preceded by one foreshock. A foreshock is like an aftershock except it occurs prior to the main earthquake, rather than after. A great example of foreshocks is the Japan 2011 mega-quake. It is well known that there were many foreshocks before that devastating quake.
Picture
After the 6.8, over a dozen aftershocks occurred with many more still occurring. It was quite strong! The depth of this M6.8 was 14.0km which is quite shallow for an earthquake of this magnitude. Now I will show you the helicorder for seismic station KEK which resides in the HL network in Greece.
Picture
You can see the location here of seismic station HL_KEK_HHZ_--. The red star is the location of the M6.8 earthquake. KEK is about 200km or so north of the epicenter.
Picture
Here is the SWARM-generated helicorder for station KEK in Greece.
Now I will quickly show two seismogram/spectrogram plots. As always, please pay attention to time period, frequency range, and amplitude count! Remember chart labels are very important and must always be read first before reading any data.
Picture
This was a foreshock. It was reportedly to be a magnitude 5.0 earthquake at 10km in depth. It occurred just about 30 minutes or so before the M6.8. At the time of writing this, 2:02PM PST 2018/10/26, there have been 26 aftershocks ranging from M5.2 to M4.0.
Picture
This is the seismogram/spectrogram plot of the main M6.8 earthquake that hit Greece at 14.0km in depth. Notice it lasted a very long time! You can also see the first aftershock right at the end of the plot (seen better on the spectrogram).

M2.9 Earthquake in Montana:

About 3 hours or so after the M6.8 occurred in Greece, a strong M2.9 earthquake struck about 20 miles northwest of Bozeman, Montana at a shallow depth of 1.0km! Personally I believe it was more like a 3.2 earthquake. Below I will show the location of the earthquake in regards to the two closest seismic stations, the helicorder for the closest seismic station (which would be station SXM), and the seismogram/spectrogram plot. Once again, I cannot stress it enough, you must pay attention to all chart labels first! Also pay attention to time period, frequency range, amplitude count, or any image captions you may see!

*Seismogram/spectrogram plots were generated using data obtained from IRIS and the MB network through the program SWARM from station SXM.
Picture
The USGS report for the Montana M2.9 quake. At the time of writing this, only 2 people reported feeling it. I do believe many more felt it though since alot of people do not report to USGS.
Picture
The location of the earthquake in regards to station SXM and BZMT. Yellowstone can be seen at the bottom of the image.
Picture
This is the custom made helicorder for SXM in the MB network. You can see the earthquake occurred after the teleseism arrived from the M6.8 in Greece.
Picture
This is the teleseism (large, distant earthquake) of the M6.8 that occurred in Greece. Again, this is from station SXM which resides very close to Bozeman, Montana.
Picture
Here is the custom made seismogram/spectrogram plot of the M2.9 earthquake near Bozeman, Montana. Note the dominant high frequencies go well beyond 25HZ!
Well that is it for now! Remember generating these images using data obtained from IRIS, and using the program SWARM, is ridiculously easy. It takes a few days to get the hang of, but once you figure it out you realize it is the best way to monitor seismic activity. Feel free to peruse my website here to discover the many different ways to monitor seismic activity. All of what I have learned, in regards to downloading/finding seismic data and analyzing it, has been put here on this website in many different pages. This is done to help others realize just how easy it is to do the things I am doing! Keep your eyes out for more blog posts. Thank you for your time and God bless!
4 Comments
Rico
10/28/2018 02:16:06 am

Thank you very much, Mr Ben. You are doing a very good job in my opinion.

Reply
Ben
10/28/2018 03:38:21 pm

Thank you much for the support! It really does mean alot. I am new to all of this but I am catching on quite quick because I love what I do!! God bless.

Reply
Lauriane
10/28/2018 04:35:01 am

Merci, merci beaucoup pour le temps que vous consacrez aux partages de connaissances.
Très bon travail, que dieu vous bénisse !

Peace

Reply
Ben
10/28/2018 03:37:34 pm

Merci pour votre soutien! N'hésitez pas à parcourir mon site web. Je vais essayer de publier des articles de blog tous les 2 jours environ. Dieu vous protège!

Reply



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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?!