Eruption on Hawaii severely attenuated the 40 m band...

Discussion in 'Ham Radio Discussions' started by VE7DXW, Dec 22, 2020.

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  1. VE7DXW

    VE7DXW Ham Member QRZ Page

    Hi Everybody;


    Highlights: Eruption on Hawaii severely attenuated the 40 m band from 02:00 UTC to 09:15 UTC


    USGS detected minor "local" quakes created propagation:

    M2.51 4 km SE of Pahala Hawaii 2020-12-21 23:05 det.: 20 m propag., 15 m, 10 m atten.
    M2.7 19 km WNW of Stanley Idaho 2020-12-21 21:04 det.: 80 m, 40 m, 10 m atten., other bands propag.
    M2.64 6 km SW of Volcano Hawaii 2020-12-21 19:39 det.: 80 m, 40 m atten., other bands propag.
    M2.69 7 km SW of Volcano Hawaii 2020-12-21 19:35 det.: 80 m, 40 m atten., other bands propag.
    M3.0 61 km NE of Ruby Alaska 2020-12-21 19:27 det.: 80 m, 40 m atten., other bands propag.
    M3.23 5 km SW of Tallaboa Puer.R. 2020-12-21 17:43 det.: 80 m, 10 m atten., other bands propag.
    M2.54 18km W of Delta Mexico 2020-12-21 16:38 det.: 80 m, 10 m atten., other bands propag.
    M2.5 1km SSE of Rollingwood CA 2020-12-21 15:41 det.: 80 m, 10 m atten., other bands propag.
    M4.3 127 km SW of Fort McPh.Can. 2020-12-21 12:16 det.: 80 m atten., 40 m propag., high band atten.
    M3.4 63 km E of U.S. Virgin Islands 2020-12-21 11:52 det.: 80 m propag., 40 m atten., highbands atten.
    M4.3 Fiji region 2020-12-21 09:06 det.: 80 m, 40 m atten.
    M4.39 14 km S of Fern Forest Hawaii 2020-12-21 08:36 det.: 80 m propag., 40 m atten.
    M2.67 9 km E of Pahala Hawaii 2020-12-21 07:58 det.: 80 m propag., 40 m atten.
    M2.58 7 km SW of Volcano Hawaii 2020-12-21 07:29 det.: 80 m propag., 40 m atten.
    M2.6 7 km SW of Volcano Hawaii 2020-12-21 07:28 det.: 80 m propag., 40 m atten.
    M2.68 6 km SW of Volcano Hawaii 2020-12-21 07:15 det.: 80 m propag., 40 m atten.
    M2.45 7 km SW of Volcano Hawaii 2020-12-21 07:11 det.: 80 m propag., 40 m atten.
    M3.45 4 km SW of Guánica P.Rico 2020-12-21 06:26 det.: 80 m propag.
    M2.9 Rat Islands Aleuti 2020-12-21 05:20 det.: 80 m propag., 40 m atten., 15 m pre dome
    M2.47 5 km ESE of Pahala Hawaii 2020-12-21 03:29 det.: 80 m, 40 m atten.
    M2.7 22 km WNW of Stanley Idaho 2020-12-21 02:46 det.: 80 m, 40 m atten.


    Today there were 15 significant earth quakes that were recorded by the USGS ranging in the size from M4.5 to M5.7. The total power output of all the quakes that were recorded by the USGS was 13418.05 GJ or 155.30 MW over a 24 h period.


    All of these quakes were recorded by the RF-Seismograph. For details and a graphical capture of the propagation and explanation see graph below.


    Synopsis: The 40 m and 20 m band was booming in at the change of the date, despite there were no quakes. This propagation is created with returning shock wave from the strong quakes the day before. At this point it attenuated the 80 m band, but it returned after 01:30 UTC, faded with the M2.7 from Stanley, Idaho, that struck at 02:46 UTC and the M4.3 from Kuwait 18 min after. The M2.47 from Hawaii at 03:29 UTC that was followed by the M4.9 Tonga 13 min after with post reaction that only favored 80 m and so did the M2.9 from the Aleutian, that released at 05:20 UTC. This quake was opening 80 m from 05:00 UTC for 45 min. Interesting is the long 15 m pre noise dome that stopped as the quake erupted. Another double event of a M3.45 UTC from Puerto Rico at 06:26 UTC and then 2 min later the M4.3 from Chile created a slow noise drop on 80 m and 40 m and a jump on 20 m at 06:45 UTC. After 07:11 UTC the USGS recorded another eruption of the Volcano on Hawaii with five quakes below M2.7 and the last one a M4.39 at 08:39 UTC. The 40 m propagation creased even more as the quakes struck. It recovers with the M4.3 from Fiji that released at 09:06 UTC, booms in as a in-between propagation only to be attenuated with the M5.0 from Fiji that struck at 10:32UTC. 80 m also attenuated as the quake struck, but recovered after 11:00 UTC together with the 80 m band, enhanced by a cluster of six quakes that started to erupt just before 12:00 UTC. The first one was the M4.6 from Indonesia at 11:49 UTC, then the M3.4 from the Virgin Islands 3 min after, continued by the M4.7 from Sand Point, Alaska 5 min after, a M4.3 from Fort McPherson, Canada, 24 min after. There was a M4.8 at 12:33 UTC from Indonesia and the last one was the M4.2 from Chile 47 min later as the last event. 80 m started to attenuate somewhat with the last quake as well, but 40 m stayed up and improved until 13:45 UTC. The attenuating effect on 80 m created by the M2.5 from Rollingwood, California can be seen after 15:00 UTC, which is unusual early for a quake that size. The 20 m and 15 m bands came back also after and were enhanced by the M4.5 from Ecuador that struck at 16:30 UTC. This was even enhanced with the quick succession of a M2.54 from Mexico 8 min later and then 30 min after the M5.7 from Wallis and Futuna. All bands were open except 80 m, which attenuated at 16:30 UTC for the rest of the day. There was a M3.23 coming from Puerto Rico at 17:43 UTC and the another M4.9 from the Philippines 31 min later, which attenuated the 30 m band, but 20 m boomed in past the M3.0 from Ruby, Alaska and then another M2.64 from Hawaii at 19:39 UTC. 40 m and 10 m were attenuated as the M5.1 from New Zealand struck at 20:07 UTC. There were three more minor quakes, all below M3.2 from Idaho, Puerto Rico and the last one again from Hawaii at 23:05 UTC, which now improved the 40 m.


    [​IMG]


    Mag Location Time Depth [km] Detected

    M5.1 Kermadec Islands New Zealand 2020-12-21 20:07 16.18 all bands propag., 80 m noise dome, 30 m noise decr.

    M4.9 0 km SSW of Banugao Philippines 2020-12-21 18:14 35.0 80 m atten., all bands propag.

    M5.7 237 km SE of Alo Wallis and Futuna 2020-12-21 17:08 10.0 80 m atten., all bands propag., except 10 m

    M4.5 96 km ESE of Gualaquiza Ecuador 2020-12-21 16:30 35.0 all bands propag., except 10 m, 80 m spikes

    M4.8 267 km WSW of Tual Indonesia 2020-12-21 12:33 89.5 80 m, 40 m propag., higher bands atten.

    M4.7 57 km SSE of Sand Point Alaska 2020-12-21 11:57 49.61 80 m, 40 m propag., higher bands atten.

    M4.6 108 km SSW of Abepura Indonesia 2020-12-21 11:49 49.83 80 m, 40 m propag., higher bands atten.

    M5.0 south of the Fiji Islands 2020-12-21 10:32 463.22 80 m atten., noise dome, 40 m post atten., propagation (-1 h to +1 h)

    M4.9 167 km NE of Neiafu Tonga 2020-12-21 03:42 10.0 80 m, 40 m, atten.


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


    All the best and 73;


    Alex - VE7DXW
     
    KA4DPO and K8VSY like this.
  2. WL7PM

    WL7PM Ham Member QRZ Page

    Are you saying, or hinting that the IONOSPHERE has a " Basement" ?
     
  3. NL7W

    NL7W Ham Member QRZ Page

    Sub-basement.
     
    KA4DPO and WA1GXC like this.
  4. N0TZU

    N0TZU Platinum Subscriber Platinum Subscriber QRZ Page

    Some days it’s a basement, some days it’s a penthouse. Only Alex is qualified to tell us which - after the fact of course.
     
    WA9SVD, N3FAA, WR2E and 1 other person like this.
  5. VE7DXW

    VE7DXW Ham Member QRZ Page

    Quite the opposite: the quakes occur very closer to the top, some of them even have negative depth numbers, which means they are above sea level.... and that is the main reason 40 m and other bands get easily effected by this volcano.
     
  6. VE7DXW

    VE7DXW Ham Member QRZ Page

    Quite the opposite: the quakes occur very closer to the top, some of them even have negative depth numbers, which means they are above sea level.... and that is the main reason 40 m and other bands get easily effected by this volcano.
     
  7. K2NCC

    K2NCC Ham Member QRZ Page

    that's some good Art Bell content. but about it.
     
    WN1MB likes this.
  8. KL7AJ

    KL7AJ Ham Member QRZ Page

    Too far out even for Art Bell. He's probably spinning in his grave, hearing this.
     
    WA9SVD, KI5WW and W4NNF like this.
  9. WZ7U

    WZ7U Ham Member QRZ Page

    But is he spinning clockwise or counter clockwise?
     
    W4NNF and WG8Z like this.
  10. SM0XHJ

    SM0XHJ Ham Member QRZ Page

    So, there is a normal amount of minor earth quakes and a high-speed solar wind hitting Earth. Must be the quakes that affected the propagation...

    upload_2020-12-22_8-24-7.png
     
    N3FAA, N1OOQ, AE8W and 4 others like this.

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