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Thread: Earthquakes, Plate Tectonics and Volcanism

  1. #121
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    Default Re: Eathquakes, Plate Tectonics and Volcanism

    So... I'd like to take this opportunity to point out something that isn't a laughing matter, nor is it something to consider (as some have) as a ridiculous issue. This volcano erupting in Iceland (called Eyjafjallajokull, and please, for the Love of God don't ask me to pronounce that... I think it is actually Mr. Spock's first name....) has started all over:

    Hopes that the Eyjafjallajökull volcano was starting to die down were dashed Tuesday when new eruptions spewed ash up more than 15,000 feet into the atmosphere, sending a new cloud of ash toward Europe.


    “Eruptions from Eyjafjallajökull have continued overnight with debris being emitted up to 4 to 5 km (13,100-16,400 feet) for much of the time,” Britain‘s Met Office reported. “Weather patterns continue to blow areas of ash towards the UK.”


    http://www.examiner.com/x-3122-Chica...-new-headaches
    Here's a link with some images:
    http://www.boston.com/bigpicture/201...e_volcano.html

    Now... let's get this clear in our heads. This thing has been going on for about four weeks or so and spewing ash into the air and has been shutting down airlines due to the ash getting into engines.

    However... on the 16th, a news article stated:


    Volcanic Eruption in Iceland Unlikely to Have Global Effects

    ScienceDaily (Apr. 18, 2010) — The eruption of an Icelandic volcano that sent a huge plume of ash into the atmosphere and caused sweeping disruptions of air traffic over Great Britain and Scandinavia today will likely dissipate in the next several days, according to a University of Colorado at Boulder atmospheric scientist.
    Further this guy from the CU- Boulder Earth Sciences department said:


    Toon said the amount of sulfur dioxide spewed by the volcano so far poses no threat to world climate as determined by an instrument aboard NASA's Aura satellite.


    But he noted than an apparently larger eruption of an Icelandic volcano in 1783 --which was written about by Benjamin Franklin -- caused some climate issues in Europe by creating smog-like conditions in London that partially blocked out the sun and persisted through the summer months.
    Obviously they are trying to make it sound as if this little belch from the planet isn't dangerous at all, and of course this is some of the same people who are screaming about "Global warming".

    In general, everyone is saying "This isn't a big deal"... but, let's look at it from another perspective for a minute. The economic perspective. This isn't a "big volcano" by some examples (Pinatubo, Krakatoa and others) but it certainly has shut down airlines and has cost millions of dollars to that industry so far.



    It has prevented many people from getting back home too. Lots of folks are stranded in the US trying to get back to Europe and lots of Americans trying to come home are stuck in Europe.

    Let's imagine now that a Mt. St. Helens type of volcano blew up. It too releases probably a similar amount of material into the air, in a shorter period of time and did if I recall, closed down airlines for a couple of days in some regions. Ash fell as far south as Texas (and I was cleaning the stuff off my car the next two days after the blast).

    Let's go one step further. Yellowstone. Yellowstone is, by all rights a huge volcano, larger and more dangerous than St. Helens was. It is a caldera type volcano and has blown up several times over the last few million years - that we know about.


    I can't find exact numbers on this, but previous estimates I've seen have shown that the last couple of times it exploded, it hefted enough debris into the air to chance the climate.


    It wouldn't be out of bounds to say that such an explosion would take down the flights in the entire northern hemisphere at first and later those to the souther hemisphere. Ships would have to be used to move people for a long time to come.

    The economy would collapse. Completely. Not just the US, but most of the EU as well, and Russia. China would be affected, India, and many more places I haven't mentioned.

    The world economy would fall apart. Humans wouldn't cease to exist, but the economy would certainly make an adjustment that many wouldn't survive.

    So... this is NOT a laughing matter - as some thing, nor is it insignificant. It's a "warning" to all of us to be prepared.
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  2. #122
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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    The Irish Times - Saturday, April 17, 2010
    Effects of Katla eruption would put current air travel chaos in the shade

    BALDUR ARNARSON in Reykjavík

    OTHER VOLCANOES: SHOULD THE Icelandic volcano Katla erupt the resulting spread of ash from the eruption column could disrupt air travel in Europe for several weeks.

    The disruption to air travel caused by the current eruption in Eyjafjallajökull would pale in comparison with such an eruption, assuming that it was of the same magnitude as the infamous Katla eruption of 1918.

    “Such an event could form an eruption column stretching up to 20km into the stratosphere,” Haraldur Sigurðsson, a world authority on volcanoes, said.

    “The distribution of ash could greatly exceed the spread from the current eruption column at Eyjafjallajökull, which has stretched 6-10km in the troposphere, and reach a substantially greater portion of the European continent.

    “The flow of magma or molten rock from Katla in 1918 was 10 times greater than the current eruption, although there is no guarantee that the next Katla eruption would be of the same magnitude.”

    Prof Sigurðsson said the spewing of ash from Eyjafjallajökull was caused by the explosive nature of the gas-rich andesite magma that is erupting.

    Icelandic settlement reaches back to the late 9th century AD, with three documented instances of an eruption in the Eyjafjallajökull volcano preceding an eruption in Katla, but 22 documented eruptions in the much more active Katla in the same period.

    This connection has not been lost by geologists observing the disaster.

    According to Prof Sigurðsson, these eruptions, in AD 920 (estimate), 1612 and 1823, are too few to establish a demonstratable pattern, suggesting that history may not repeat itself this time around.

    Nevertheless, a scenario in which the current eruption triggers Katla to erupt is quite possible, as Helgi Björnsson, one of Iceland’s foremost glacier experts, points out with a reference to the interconnectivity of the volcanic system and historical records.

    An eruption in Katla would not only inflict economic losses upon Europe, as the impact of the eruption and resulting flooding could greatly exceed the damages by the Eyjafjallajökull eruption in the area.

    Icelandic history is rich of tales of the might of the much-feared Katla volcano.

    Photographs taken of the 1918 eruption provide the first visual account of the extraordinary forces at play.

    The magnificent eruption column aside, the photographs show how icebergs carried by the flooding from the 600-metre or so deep ice shield over the Katla crater could reach up to 30 metres in height, according to Porir Kjartansson, a history enthusiast who recalls tales from the area.

    For comparison, the ice sheet on Eyjafjallajökull is estimated to be 250 metres thick.

    Mr Kjartansson says that the flooding is also considered to have brought a 2,000-ton rock from the volcano to the black volcanic desert of Mýrdalssandur, while also extending the beach by a factor of 2km within the first 24 hours of the 1918 eruption.

    Mr Björnsson adds that locals feared eruptions and resulting flooding in the nearby desert to the extent that they created emergency plans should the bursting floods begin while they were crossing the volcanic sands.

    Porour Tómasson, curator at the Skógar Museum near the volcanic desert, also recalls tales of dramatic destruction of farms and livestock in floodings from the volcano.

    One of these tales describes how adjacent pasture and farmhouses were covered so extensively by the ferocious flooding that only a single horse standing on a hill escaped.

    Mr Björnsson also recalls a dramatic tale from 1311 in which a man and an infant survived a flood caused by Katla by staying on the surface of an iceberg that the tide would later bring back to the beach. They were the only ones to survive.
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  3. #123
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    Default Re: Earthquakes, Plate Tectonics and Volcanism



    http://earthquake.usgs.gov/earthquak...10/us2010zpac/

    Magnitude 4.8 - WYOMING
    2010 August 05 00:04:17 UTC

    Earthquake Details


    • This event has been reviewed by a seismologist.

    Magnitude4.8
    Date-Time

    Location43.585N, 110.440W
    Depth5 km (3.1 miles) set by location program
    RegionWYOMING
    Distances30 km (20 miles) ENE of Jackson, Wyoming
    65 km (40 miles) W of Dubois, Wyoming
    95 km (60 miles) NNW of Pinedale, Wyoming
    535 km (335 miles) WNW of CHEYENNE, Wyoming
    Location Uncertaintyhorizontal +/- 6.4 km (4.0 miles); depth fixed by location program
    ParametersNST= 41, Nph= 41, Dmin=13.6 km, Rmss=1.29 sec, Gp= 50,
    M-type=body wave magnitude (Mb), Version=7
    Source
    • USGS NEIC (WDCS-D)

    Event IDus2010zpac

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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    6 Small Earthquakes Shake Parts of Oklahoma
    Sep 5, 2010

    For the second time in less than a week, six small earthquakes have been recorded in a single day in central Oklahoma.

    The Oklahoma Geological Survey said the six earthquakes on Saturday ranged from preliminary magnitudes of 1.5 to 3.3.

    On Wednesday in the same area about 30 miles from Oklahoma City, geologists also recorded six earthquakes that ranged from a preliminary 1.8 magnitude to 3.1. Another quake with a preliminary magnitude of 2.7 was recorded Friday about 10 miles east of the Saturday temblors.

    No injuries or damage was reported from any of the earthquakes.

    Quakes of magnitude 2.5 to 3 are generally the smallest felt by people.

  5. #125
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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    Hmmm

    Wyoming obviously has active magma tubes underneath. I lived in OK for five years. Don't remember any quakes there. The land is about 88% flat, slightly hilly, and no volcanic activity at all of which I was aware.
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  6. #126
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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    Meers Fault. SW OK. I have been to Meers. It slipped over a meter one thousand years ago... hmmm
    Last edited by American Patriot; September 7th, 2010 at 16:50.
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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    [COLOR=Black]
    6.2 Mw - FIJI REGION>>

    Preliminary Earthquake Report>>
    Magnitude>>
    6.2 Mw>>
    Date-Time>>
    · 7 Sep 2010 16:13:33 UTC>>
    · 8 Sep 2010 04:13:33 near epicenter>>
    · 7 Sep 2010 09:13:33 standard time in your timezone>>
    Location>>
    15.917S 179.364W>>
    Depth>>
    10 km>>
    Distances>>
    · 727 km (452 miles) NW (323 degrees) of NUKU'ALOFA, Tonga>>
    · 3175 km (1973 miles) W (269 degrees) of PAPEETE, Tahiti, French Polynesia>>
    Location Uncertainty>>
    Horizontal: 13.6 km; Vertical >>
    Parameters>>
    Nph = 78; Dmin = 999.9 km; Rmss = 1.54 seconds; Gp = 136°
    M-type = Mw; Version = 6 >>

    Event ID>>
    US 2010axa9 >>
    For updates, maps, and technical information, see:
    Event Page

    or
    USGS Earthquake Hazards Program

    National Earthquake Information Center
    U.S. Geological Survey
    http://neic.usgs.gov
    /
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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    Pictures from the recent 7.0 that hit New Zealand on 9/4/2010 - http://www.crashbang.co.nz/quake040910/index.html


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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    Column of Molten Rock Found Under Yellowstone
    September 9, 2010


    A map of the Yellowstone Caldera reveals geological features beneath the National Park.

    A plume of molten rock rising from deep beneath Yellowstone National Park is probably what is fueling the region's volcanic activity, as well as tectonic plate oddities across the Pacific Northwest, new research suggests.

    Building on a growing body of evidence, Mathias Obrebski of the University of California, Berkeley, and his colleagues created the most convincing picture to date of a Yellowstone mantle plume -- one that extends from about 621 miles (1,000 kilometers) below the surface of the Earth.

    Debates have long been waged over whether erupting and shaking in the area over the last few millions of years - and a track marked out by a chain of volcanic calderas along the Yellowstone Snake River Plain in Idaho -- could be the work of a column of hot rock rising up from deep within the Earth's mantle. The mantle is the layer of hot, viscous rock beneath the planet's crust.

    The very existence of such mantle plumes is doubted by some scientists.

    "They are extraordinary features, in size and in the fact that they travel upward through the whole mantle in solid form," said Vic Camp of San Diego State University, who was not involved in the new study. "It's a really simple idea to explain a number of different phenomena on Earth. But the simple idea was very difficult to test."

    "Chemical and physical volcanology evidence suggested a plume, but this is the first seismic proof," Camp told OurAmazingPlanet.

    Obrebski's team used data from a new, dense deployment of seismometers, called the Earthscope USArray, to get a high-resolution image of the once-elusive mantle, along with information on the unusual structure of the subducting Juan de Fuca slab to its west. The Juan de Fuca plate is a small tectonic plate jammed in between the much larger Pacific and North American plates.

    Much like an MRI scan of a human body, seismometers' antennas capture seismic waves of earthquakes traveling through the earth from various directions. The waves' speeds provide hints of the materials and temperatures they pass through, informing the resulting 3-D image, explained Robert Smith of the University of Utah, who wasn't involved in the new research but whose group had recently imaged Yellowstone's mantle plume down to about 372 miles (600 km).

    The plume is thought to be more or less stationary, with the North American plate -- and the Juan de Fuca subducting beneath it -- slowly sliding southwesterly over the plume. So what is now Oregon probably sat where Yellowstone is today about 17 million years ago, baking and breaking over a hot plume of rock, Camp said.

    Obrebski said in an interview: "There's been subduction in the [Oregon] region for more than 150 million years, so we'd expect to see a large continuous slab. But what we see are just fragments."

    The location of those pieces, he added, suggests that the slab and the plume are tightly related.

    The findings were detailed in the July 22 edition of the journal Geophysical Research Letters.

    These observations may also help explain the unusual lack of deep seismology in the Pacific Northwest, and perhaps shed light on some larger mysteries. "If you look at the mass extinctions on Earth," Camp said, "we think that a few may have been associated with eruptions from mantle plumes."

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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    So...... when does it blow?
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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    12-21-2012, of course. Man, don't you read?

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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    Oh, yeah. I forgot. hehe
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    Default Re: Earthquakes, Plate Tectonics and Volcanism


    7.2 Mw - NEAR S COAST OF PAPUA, INDONESIA

    Preliminary Earthquake Report
    Magnitude
    7.2 Mw
    Date-Time
    · 29 Sep 2010 17:11:24 UTC
    · 30 Sep 2010 02:11:24 near epicenter
    · 29 Sep 2010 10:11:24 standard time in your timezone
    Location
    4.920S 133.783E
    Depth
    12 km
    Distances
    · 109 km (68 miles) NNW (334 degrees) of Dobo, Aru Islands, Indonesia
    · 307 km (191 miles) WSW (246 degrees) of Enarotali, Irian Jaya, Indonesia
    · 433 km (269 miles) NE (38 degrees) of Saumlaki, Tanimbar Islands, Indonesia
    · 638 km (396 miles) ESE (103 degrees) of Ambon, Moluccas, Indonesia
    · 993 km (617 miles) ENE (66 degrees) of DILI, East Timor
    Location Uncertainty
    Horizontal: 13.7 km; Vertical 2.6 km
    Parameters
    Nph = 146; Dmin = 279.4 km; Rmss = 1.36 seconds; Gp = 25°
    M-type = Mw; Version = 6

    Event ID
    US 2010bubv
    For updates, maps, and technical information, see:
    Event Page

    or
    USGS Earthquake Hazards Program

    National Earthquake Information Center
    U.S. Geological Survey
    http://neic.usgs.gov
    /

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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    OK - Norman OK has had a 4.5 quake. Two injuries.
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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    Arkansas Earthquake Swarm Jolts Residents
    October 11th, 2010

    A magnitude 4.0 earthquake shook residents of Conway, Arkansas awake this morning at approximately 8:33 AM local time.

    This was one of 45 earthquakes on record for the region since last Wednesday, October 6, 2010 Wednesday, all of them minor.

    The 4.0 magnitude quake that struck Guy, Arkansas this morning was one of three quakes within three miles of Guy. The wave of temblors has residents quite concerned and the USGS said they are investigating. The swarm began last Wednesday on October 6, 2010 and so far there’s not been any serious injuries or damage reported.

    Today’s quake had a depth of 3.1 miles and was 40 miles N of Little Rock.
    Shelia Maxwell of the Faulkner County Office of Emergency Management said “We’re having them in places we’ve never had them before.The USGS is looking into why we’re having them and why there have been so many.”

    I hope they figure it out—-there’s certainly been an increase in earthquake swarms lately! Not quite sure how I would react to an earthquake—no matter how minor!

    What do you think about the outbreak of earthquakes—-worldwide? I admit to thinking it’s Biblical, but then someone will claim it’s Mother Nature, Global warming or George W. Bush’s fault.

    Regardless, how do you prepare? Can you prepare? Where and when will the next outbreak be? So many questions with no answers in sight.

    If you have any thoughts or theories on earthquakes and the recent swarms, please leave them in the comment section below.

    Details are from the USGS.

    Magnitude 4.0
    Date-Time

    * Monday, October 11, 2010 at 13:33:40 UTC
    * Monday, October 11, 2010 at 08:33:40 AM at epicenter
    * Time of Earthquake in other Time Zones

    Location 35.304°N, 92.317°W
    Depth 5 km (3.1 miles)
    Region ARKANSAS
    Distances 25 km (15 miles) NNE of Conway, Arkansas
    55 km (35 miles) W of Searcy, Arkansas
    60 km (40 miles) N of LITTLE ROCK, Arkansas
    65 km (40 miles) SSW of Mountain View, Arkansas
    Location Uncertainty horizontal +/- 0.6 km (0.4 miles); depth +/- 0.6 km (0.4 miles)
    Parameters NST= 19, Nph= 30, Dmin=3 km, Rmss=0.24 sec, Gp= 79°,
    M-type=centroid moment magnitude (Mw), Version=D
    Source

    * Cooperative New Madrid Seismic Network

    Event ID nm1054 This event has been reviewed by a seismologist.

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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    My daughter lives in Norman. She called this am with a report. It was her first earthquake expereince. She said she was not the least bit shaken.

    AARRRGGHH!!!

    She has inherited the hillbilly humor gene.
    "Still waitin on the Judgement Day"

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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    Lol!

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    Default Re: Earthquakes, Plate Tectonics and Volcanism

    Quote Originally Posted by Luke View Post
    My daughter lives in Norman. She called this am with a report. It was her first earthquake expereince. She said she was not the least bit shaken.

    AARRRGGHH!!!

    She has inherited the hillbilly humor gene.
    hahahaha

    Hillbilly Humor Gene. My sister has at least three of those, and one is mutated.
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    Default Re: Earthquakes, Plate Tectonics and Volcanism


    6.9 Mw - GULF OF CALIFORNIA

    Preliminary Earthquake Report
    Magnitude
    6.9 Mw
    Date-Time
    21 Oct 2010 17:53:14 UTC
    21 Oct 2010 11:53:14 near epicenter
    21 Oct 2010 10:53:14 standard time in your timezone
    Location
    24.843N 109.171W
    Depth
    10 km
    Distances
    105 km (65 miles) S (191 degrees) of Los Mochis, Sinaloa, Mexico
    106 km (66 miles) SSW (210 degrees) of Gabriel Leyva Solano, Sinaloa, Mexico
    107 km (66 miles) SSW (199 degrees) of Juan Jos? R?os, Sinaloa, Mexico
    1147 km (713 miles) SE (136 degrees) of Tijuana, Baja California, Mexico
    Location Uncertainty
    Horizontal: 6.1 km; Vertical
    Parameters
    Nph = 187; Dmin = 843.1 km; Rmss = 1.17 seconds; Gp = 133
    M-type = Mw; Version = 6

    Event ID
    US 2010crbl
    For updates, maps, and technical information, see:
    Event Page

    or
    USGS Earthquake Hazards Program

    National Earthquake Information Center
    U.S. Geological Survey
    http://neic.usgs.gov
    /
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    Default Re: Earthquakes, Plate Tectonics and Volcanism


    7.5 M - KEP. MENTAWAI REGION, INDONESIA

    Preliminary Earthquake Report
    Magnitude
    7.5 M
    Date-Time
    25 Oct 2010 14:42:22 UTC
    25 Oct 2010 21:42:22 near epicenter
    25 Oct 2010 07:42:22 standard time in your timezone
    Location
    3.464S 100.083E
    Depth
    14 km
    Distances
    245 km (152 miles) W (278 degrees) of Bengkulu, Sumatra, Indonesia
    281 km (175 miles) S (186 degrees) of Padang, Sumatra, Indonesia
    446 km (277 miles) WSW (242 degrees) of Jambi, Sumatra, Indonesia
    674 km (419 miles) SW (218 degrees) of SINGAPORE
    Location Uncertainty
    Horizontal: 14.1 km; Vertical 0.0 km
    Parameters
    Nph = 300; Dmin = 334.0 km; Rmss = 1.49 seconds; Gp = 21
    M-type = M; Version = 1

    Event ID
    US a00043nx
    For updates, maps, and technical information, see:
    Event Page

    or
    USGS Earthquake Hazards Program

    National Earthquake Information Center
    U.S. Geological Survey
    http://neic.usgs.gov
    /
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