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August 2nd, 2006

This is a truly unique recording. Several years ago I found out that I am the only person in the world who captured audio of the May 18, 1980 eruption of Mt. St. Helens, the volcano in Washington state. I was in high school in 1980, living in Newport, Oregon, 140 miles southwest of the mountain. May 18 was a beautiful sunny morning, and as we were eating breakfast we heard several distant "thuds" or booms. We went outside, and noticed that they were coming from the north. We had no idea what they were, and since Mt. St. Helens was so far away, we "knew" it could not be the mountain. But in the back of my mind I thought, "could it be?". So I grabbed a tape recorder and set it in a window box upstairs on the north side of the house. This recording is an excerpt of what I captured. The entire tape is about eight minutes long. Unfortunately the quality is poor, but it was the only tape recorder we owned. I started recording about two minutes after we heard the first boom. In total there were about 10 booms over a period of about ten minutes. I never did anything with the tape because of the poor quality. Also I figured that the USGS, etc. had also recorded the sound. But I found out recently that no one else made an audio recording. The booms were picked up on seismometers, but no audio was recorded. As I understand it, when the mountain first erupted it sent a low-frequency "shock wave" straight up. This wave reflected off several layers of the atmosphere, bouncing back to the ground in a large donut-shaped ring about 50 to 300 miles around the mountain. People within 50 miles of the mountain did not hear anything. I am not sure if what we heard was one "shock wave" reflected many times between layers of the atmosphere and the ground, or a series of waves. The booms are very low frequency, thus you should listen with headphones or larger speakers. On laptop speakers you probably won't hear anything. Many people who heard the booms described them as a series of "thuds". I also believe that this may be the only audio recording of this phenomena from any volcano. I imagine that the eruption of Krakatoa in 1883 sounded similar to this (but louder). I wonder too if anyone knows of any atmospheric audio recorded from a distance greater than this (140 miles/225 km)? If you would like to study the entire recording, please contact me.

UPDATE 6/8/2014: I have uploaded the original, untouched recording here: http://www.freesound.org/people/daveincamas/sounds/240257/

Comments

  • avatar
    kraut2 1 week ago

    On that day my wife and I were driving back to our cabin in the Cabinet Mountains in Idaho. We were on the west side of the mountain on which we live. We heard 3 distinct "booms" just a few seconds apart. I thought it might be that they were bouncing of off the mountains. Later that afternoon we saw a dark "cloud" moving our way. Little did we know it was ash. The best that I can figure is that we were about 280 miles from the eruption. We were covered by ash twice. The first being the worst. I took a sample and sent it to a friend that worked in a lab at Texas A&M university to be tested. She sent back a long sheet explaining the components of the ash with silica being the most.

  • avatar
    agathajackson 1 week, 1 day ago

    Hello,

    Can you please e-mail me to discuss the licensing terms for the potential use of this recording in a National Geographic documentary? agatha.jackson@offthefence.com

    Thanks,
    Agatha

  • avatar
    hoswaypr 2 years ago

    Nice!

  • avatar
    PrincessGrace 2 years, 9 months ago

    This is really cool! Thanks for sharing!

  • avatar
    snideology 3 years ago

    Outstanding! Thanks for sharing.

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(127)
Type
Wave (.wav)
Duration
00:43:453
Filesize
3.7 MB
Samplerate
44100.0 Hz
Bitdepth
16 bit
Channels
Mono
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