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Earthquakes

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    Magnitude 5.0 earthquake
    9 miles from Anchorage, AK · Jan 13, 8:45 AM


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    Magnitude 6.7 earthquake
    9 miles from Coquimbo, Chile · Jan 19, 5:32 PM


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    Magnitude 6.6 earthquake
    Affected countries: El Salvador, Guatemala, and Mexico
    10 miles from Chiapas, Mexico · 8:14 AM


  • Registered Users Posts: 10,160 ✭✭✭✭ M5
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    Hi folks,

    Was there any local seismic activity this morning at around 8am? in N Kildare/S Meath? I was in bed and the metal curtain rails and a few other bits in the room rattled/vibrated for about 10-15 seconds.

    I would describe it as similar to a train passing by. I lived in the US, my apartment was about 50m away from a slow moving train and a similar level of vibration to that was what i felt this morning. Thing is we live miles away from the nearest busy road/train and are 100m away from the bohereen so truck/train etc are not likely


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    Magnitude 1.5 County Donegal per Dublin Institute for Advanced Studies August 2017?


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  • Registered Users Posts: 10,160 ✭✭✭✭ M5
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    Fathom wrote: »
    Magnitude 1.5 County Donegal per Dublin Institute for Advanced Studies August 2017?

    Hell of a delay on the aftershock :D:D

    Probably another logical explanation or some minor local event. Very odd


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    Magnitude 5.8 earthquake
    Affected countries: Peru and Ecuador
    19 miles from Guayaquil, Ecuador · Feb 4, 9:45 AM


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    Magnitude 6.2 earthquake
    386 miles from Portugal · Feb 14, 11:57 AM


  • Registered Users Posts: 947 ✭✭✭ Conchir
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    I read an article recently on the Cascadia Fault in California and preparations for a possible future quake there. Really interesting article, I'd recommend it.

    Anyway, in it they describe how researchers uncovered the last Cascadia quake, from 1700, with a really wide range of evidence. Pretty fascinating I think.
    In the late nineteen-eighties, Brian Atwater, a geologist with the United States Geological Survey, and a graduate student named David Yamaguchi found the answer, and another major clue in the Cascadia puzzle. Their discovery is best illustrated in a place called the ghost forest, a grove of western red cedars on the banks of the Copalis River, near the Washington coast. When I paddled out to it last summer, with Atwater and Yamaguchi, it was easy to see how it got its name. The cedars are spread out across a low salt marsh on a wide northern bend in the river, long dead but still standing. Leafless, branchless, barkless, they are reduced to their trunks and worn to a smooth silver-gray, as if they had always carried their own tombstones inside them.

    What killed the trees in the ghost forest was saltwater. It had long been assumed that they died slowly, as the sea level around them gradually rose and submerged their roots. But, by 1987, Atwater, who had found in soil layers evidence of sudden land subsidence along the Washington coast, suspected that that was backward—that the trees had died quickly when the ground beneath them plummeted. To find out, he teamed up with Yamaguchi, a specialist in dendrochronology, the study of growth-ring patterns in trees. Yamaguchi took samples of the cedars and found that they had died simultaneously: in tree after tree, the final rings dated to the summer of 1699. Since trees do not grow in the winter, he and Atwater concluded that sometime between August of 1699 and May of 1700 an earthquake had caused the land to drop and killed the cedars. That time frame predated by more than a hundred years the written history of the Pacific Northwest—and so, by rights, the detective story should have ended there.

    But it did not. If you travel five thousand miles due west from the ghost forest, you reach the northeast coast of Japan. As the events of 2011 made clear, that coast is vulnerable to tsunamis, and the Japanese have kept track of them since at least 599 A.D. In that fourteen-hundred-year history, one incident has long stood out for its strangeness. On the eighth day of the twelfth month of the twelfth year of the Genroku era, a six-hundred-mile-long wave struck the coast, levelling homes, breaching a castle moat, and causing an accident at sea. The Japanese understood that tsunamis were the result of earthquakes, yet no one felt the ground shake before the Genroku event. The wave had no discernible origin. When scientists began studying it, they called it an orphan tsunami.

    Finally, in a 1996 article in Nature, a seismologist named Kenji Satake and three colleagues, drawing on the work of Atwater and Yamaguchi, matched that orphan to its parent—and thereby filled in the blanks in the Cascadia story with uncanny specificity. At approximately nine o’ clock at night on January 26, 1700, a magnitude-9.0 earthquake struck the Pacific Northwest, causing sudden land subsidence, drowning coastal forests, and, out in the ocean, lifting up a wave half the length of a continent. It took roughly fifteen minutes for the Eastern half of that wave to strike the Northwest coast. It took ten hours for the other half to cross the ocean. It reached Japan on January 27, 1700: by the local calendar, the eighth day of the twelfth month of the twelfth year of Genroku.

    Really good display of different disciplines combining to reconstruct environmental history. The Cascadia fault is 319 years into a 243 year recurrence interval, so a big one is predicted by some geologists, according to the article.

    https://www.newyorker.com/magazine/2015/07/20/the-really-big-one


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    Anything 8.0 or over will toast Los Angeles. Said the Big One is coming. But in geological time. Tomorrow or hundreds of years from now. Just a blink of the eye.


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    Magnitude 7.5 earthquake
    Affected countries: Peru, Colombia, and Ecuador
    81 miles from Sucua, Ecuador · Feb 22, 2:17 AM


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    Magnitude 7.0 earthquake
    Affected countries: Brazil, Bolivia, Peru, and Chile
    3 miles from San José District, Peru · Mar 1, 12:50 AM


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    Magnitude 6.2 earthquake
    Affected countries: Fiji and Tonga
    111 miles from Fiji · Mar 10, 12:12 AM


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    Magnitude 6.3 earthquake
    19 miles from Vanuatu · Mar 20, 8:23 AM


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    Magnitude 6.1 earthquake
    Affected countries: Colombia, Ecuador, and Panama
    5 miles from El Dovio, Valle del Cauca, Colombia · Mar 23, 12:21 PM


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    Magnitude 6.1 earthquake
    182 miles from Petropavlovsk-Kamchatskiy, Russia · 3:06 PM


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    M 4.6 - 117km SW of Puerto El Triunfo, El Salvador
    2019-03-29 04:07:23 (UTC)12.412°N 89.164°W10.0 km depth


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    Magnitude 5.3 earthquake
    14 miles from Waikoloa Village, HI · Apr 13, 8:09 PM


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    Magnitude 5.9 earthquake
    22 miles from Aalo, Arunachal Pradesh · 1:15 PM


  • Moderators, Science, Health & Environment Moderators Posts: 5,207 Mod ✭✭✭✭ slowburner
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    Really cool animation showing the occurence of earthquakes globally since 1901.



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    Wow! Cool site slowburner.


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    Magnitude 6.2 earthquake
    250 miles from Hadiboh, Yemen · Apr 29, 7:19 AM


  • Moderators, Science, Health & Environment Moderators Posts: 5,207 Mod ✭✭✭✭ slowburner
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    I'm a little surprised nobody mentioned this one...
    https://www.rte.ie/news/ulster/2019/0430/1046491-donegal-earthquake/


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    slowburner wrote: »
    I'm a little surprised nobody mentioned this one...
    https://www.rte.ie/news/ulster/2019/0430/1046491-donegal-earthquake/
    Magnitude 2.1 had been recorded in Co Donegal. Continental drift?


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    Fracking represents one small component for induced earthquakes according to USGS.


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    Seasonality and Increasing Frequency of Greenland Glacial Earthquakes per Science.


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    Magnitude 8.0 earthquake
    Brazil, Peru, Colombia, and Ecuador affected
    May 26, 12:41 AM

    Wow!


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    Trio of earthquakes rattles Southern California. Pre-shocks for the BIG ONE?


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    5 recent earthquakes in California.


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    Magnitude 4.0 earthquake
    4 miles from Eastlake, Ohio · Jun 10, 7:50 AM


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