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RF-Seismograph: White Island Eruption causes worldwide Radio Blackout

Discussion in 'Amateur Radio News' started by VE7DXW, Dec 9, 2019.

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  1. VE7DXW

    VE7DXW Ham Member QRZ Page

    Hi Everone;

    The White Island erruption was detected by the RF-Seismograph here in the Pacific Norht West! The recorded data shows quite clealy that there was also a precursor to the erruption of more than 2 h. After the eruption the ionosphere stayed disturbed and created a radio blackout for more than 4 h!


    If you want to receive these earthquakes reports on a regular bases please join the group. Please feel free to forward this message to third parties.

    All the best and 73;

    Alex - VE7DXW

    Attached Files:

    K7YB, W7GST, KC5OMC and 3 others like this.
  2. WJ4U

    WJ4U Subscriber QRZ Page

  3. AG6QR

    AG6QR Premium Subscriber QRZ Page

    I thought the RF seismograph was sensitive to earthquakes? There was no significant earthquake associated with this eruption. The next day (30 minutes ago, as I'm writing) there was a 5.1 magnitude quake a fair distance away in NZ, but then again, there were 16 other earthquakes today of magnitude 4.5 or greater worldwide out of today's 44 quakes listed by the USGS. (Their list doesn't go low enough in magnitude to list the volcanic eruption)

    The volcano eruption made the news, because of the terrible tragedy. But in terms of earth movement, it was tiny. How many of today's larger events did the RF seismograph detect?
    N1GKE, N0TZU, AG5DB and 2 others like this.
  4. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    Please stop confusing us with facts!
  5. KG4ZAR

    KG4ZAR Ham Member QRZ Page

    Well ya know what they say.........facts is stranger than truth!
    And no ........ I don't know who "they" is.
  6. KA2IRQ

    KA2IRQ Ham Member QRZ Page

    There are always earthquakes preceeding an eruption... that's what causes the eruption.
  7. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    Well, no that can't be stated as universally true. [Actually the opposite is true!]

    Oregon State Univ. Geology:
    Most earthquakes directly beneath a volcano are caused by the movement of magma. The magma exerts pressure on the rocks until it cracks the rock. Then the magma squirts into the crack and starts building pressure again. Every time the rock cracks it makes a small earthquake. These earthquakes are usually too weak to be felt but can be detected and recorded by sensitive instruments.

    Once the plumbing system of the volcano is open and magma is flowing through it, constant earthquake waves, called harmonic tremor, are recorded (but not felt).The distribution of earthquakes provides information about magma pathways and the structure of volcanoes.
    Last edited: Dec 10, 2019
    N1GKE likes this.
  8. N3HGB

    N3HGB Ham Member QRZ Page

    So how many radio blackouts are there in a typical month?
    N0TZU likes this.
  9. W1YW

    W1YW Ham Member QRZ Page

    I didn't notice ANY radio blackout. Just the usual baseline, horrible conditions.
    NK9Y, W7XLR, WQ4G and 2 others like this.
  10. KK4NSF

    KK4NSF Ham Member QRZ Page

    Actually, I did notice an increase in background noise on 12/8 around 5pm CST (~0:00 UTC) while doing a RA (solar noise) experiment, that lasted several hours. It was not a dramatic blackout, but it was broadbanded. Of course I have no way to determine the source, but the duration appears to roughly correlate with the time on the graph. +- an hour or so.

    I'll look at my numbers and see if I can determine IF it does correlate, of it it is a coincidence, or whatever....

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