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Thread: A tectonic plate is dying under Oregon. Here’s why that matters.

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    Default A tectonic plate is dying under Oregon. Here’s why that matters.

    A tectonic plate is dying under Oregon. Here’s why that matters.

    Something was nagging at William Hawley, and it was more about what was missing than what was there.

    As a Ph.D. student at the University of California, Berkeley, Hawley is fascinated with the geologic complexities of the Cascadia subduction zone, a giant fault off the coast of the Pacific Northwest. There, the Juan de Fuca tectonic plate plunges under the North American plate, building strain throughout the region and prompting fears of the massive earthquake that could strike when it releases.

    Hawley, however, was distracted by a peculiar region below central Oregon where it appears that a chunk of the Juan de Fuca plate is missing. He wasn’t the first to notice this gap, but it nagged at the back of his brain. Such a feature must be affecting the surface—and he wanted to know how.

    Now, he might finally have an answer. In a study recently published in Geophysical Research Letters, Hawley and his coauthor Richard Allen suggest that the missing piece is not just a hole, but a tear that’s slowly splitting the plate apart at least 93 miles beneath the surface.

    “I know that this seems like this little tear is a long way down,” Hawley says. But the presence of such a feature could be the root of a number of hazards at the surface, helping scientists more accurately identify future dangers. For instance, as the southern limb of the split rotates away, its motion could be the cause of strong earthquakes that rattle off the coast of southern Oregon and northern California, the new model suggests. Such a tear could also explain a string of curious volcanism that swoops across a broad swath of Oregon.

    What’s more, the study is giving scientists a peek into the final moments of a tectonic plate’s life. The Juan de Fuca is one of the few remaining fragments of the once mighty Farallon plate, which North America began languidly consuming some 180 million years ago as the supercontinent Pangea broke apart. What happens when such plates are swallowed up is still unknown—but it’s a fate that awaits all of the planet’s oceanic plates.

    “What we are looking at right now is the death of an oceanic plate,” Hawley says. (Find our what might happen when Earth’s tectonic plates grind to a halt.)

    Other scientists are greeting the new model with curiosity and excitement, but they also caution that it needs more testing before it can become geologic canon.

    “I think there are certainly good ideas,” says Martin Streck, a volcanologist at Portland State University who specializes in the geologic activity of the Pacific Northwest. “But we may discuss this for some years to come.”

    Earth’s crust is fractured into an interlocking network of tectonic plates, whose slow-motion dance has shaped the surface of our planet. They grind against one another, pulling apart at some edges and colliding in others. These collisions often form what are known as subduction zones, where oceanic plates take the plunge while continental plates ride high.

    Researchers once thought that at any given subduction zone, the diving plate simply curls down into the deep, dropping in a sheet like a curtain, Hawley explains. But scientists have realized that just isn’t the case, based on the data gathered from an increasing number of instruments imaging Earth’s innards—including the thousands of seismometers of the National Science Foundation’s EarthScope project, as well as the onshore and underwater arrays of the Cascadia Initiative, all of which were used in this latest study.

    Now, we know that as one plate dips under another, it can deform, warping and breaking in unexpected ways. How this tortured fate affects the surface, however, is not always clear, particularly as a tectonic plate nears its end. The dying Juan de Fuca plate is a perfect opportunity to study such impacts, in part because it’s not going quietly into the deep, so scientists are closely monitoring the system’s every shiver and burp. (Here’s how we found out that a powerful earthquake split a tectonic plate in two.)

    To study the plate’s subterranean gap, Hawley and Allen first needed to confirm that it really exists and was not just some artifact hiding in the data. The duo constructed a high-resolution look into the subsurface by mapping out the different speeds of seismic waves that 217 earthquakes sent rippling through the region. The speeds of these waves change depending on the temperature and composition of the rock, so they were able to "see" the colder, denser oceanic plate as it sinks into Earth and confirm that part of it is indeed missing.

    With this new high-resolution data on the gap, the duo are effectively saying, “No, really, really. It’s really there,” quips seismologist Lara Wagner of the Carnegie Institution for Science, who has extensively studied the Farallon plate.

    Another piece of the puzzle clicked into place when Hawley and Allen discovered that the position of the tear aligns with a previously identified zone of weakness known as a propagator wake, which cuts through the Juan de Fuca plate exposed at the seafloor and likely continues as it descends into the mantle. The researchers posit that the subducted plate is tearing along this zone of weakness as the southern section of the plate rotates in a clockwise direction, slowly splitting from the northern section of the plate. (Find out how a peeling tectonic plate may one day cause the Atlantic Ocean to shrink.)

    “You’re essentially unzipping these two plates that used to be together,” Wagner says. “But it was a weak zipper—and that zipper is that propagator wake.”

    The motion of this split and twist could also explain the distortion seen—and felt—at the surface off the coast of southern Oregon and northern California, Hawley explains. This southern zone of the Juan de Fuca plate is riddled with earthquake-prone faults—exactly like what you’d expect from the newly proposed model.

    Explosive ideas

    The final piece of the puzzle is the volcanism. A string of volcanoes called the High Lava Plains stretches across southern Oregon and spouts an odd combination of magmas: Some are silica-rich, forming light-colored rocks known as rhyolite, while others are rich in magnesium and iron, forming jet-black rocks known as basalts. A tiny amount also has a composition in between these magma types.

    This is surprisingly similar to the contrasting magmas that long ago erupted from the nearby Yellowstone volcanoes, and the light-colored rhyolites of both systems change in age from one end of the volcanic chain to the other. (Peer into the inner-workings of Yellowstone’s supervolcano in this stunning illustration.)

    Yellowstone’s volcanoes are the result of an underlying magmatic hotspot, which is thought to sit largely stationary as the North American plate slowly drifts to the southwest. This results in a line of eruptions growing progressively older in the same direction.

    “The issue is that it’s going the wrong direction,” Hawley says of the High Lava Plains, with the rhyolitic rocks growing progressively older as you move toward the east. Researchers have previously devised a number of scenarios to explain this oddity, but no solution has been perfect.

    The new model presents another compelling possibility: Intriguingly, the youngest zone of the High Lava Plains sits just above the tip of the tectonic tear. As this tip propagated through the plate’s weak zone toward the west, mantle upwelling might have melted the crust above, resulting in explosions of rhyolitic magma that follow the age progression seen at the surface.

    Tectonic time machine

    “I think it’s a really interesting paper, and it’s really cool seeing another explanation for something that’s anomalous,” says Matthew Brueseke, an igneous petrologist at Kansas State University. But the model still needs to incorporate more information from the chemistry of the rocks, he says. Brueseke is particularly curious to see which trace elements are locked in the rocks, and how that might compare to other regions that sit on top of proposed slab tears. (Learn more about how volcanoes commonly form around subduction zones.)

    For example, past studies hint that similar rips might lurk under the Caribbean island of Hispaniola, as well as near the juncture between the volcanoes of Russia’s Kamchatka Peninsula and Alaska’s Aleutian Islands. By comparing the chemistry of rocks in a range of regions, scientists might get a better grip on their magmatic origins.

    The new model also can’t explain everything about the High Lava Plains, Streck adds. Even if the tear can account for the rhyolitic rocks’ decrease in age from east to west, the basaltic rocks don’t follow a similar trend, with that type of magma seeming to have erupted willy-nilly across the region.

    Still, the latest work presents a compelling possibility for what might be lurking beneath Oregon—and it probes vital questions about the basic processes behind Earth’s geologic churn.

    “In many ways, when we’re looking at these things, we’re looking back in time,” Wagner says. “If we don’t understand how those processes work[ed] in the past, where we can see the whole story and study it, then our chances of seeing what’s happening today and understanding how that might evolve in the future are zero.”
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    That area is profoundly geologically dangerous. If it happens a major catastrophe will ensue.

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    Quote Originally Posted by crowonapost View Post
    That area is profoundly geologically dangerous. If it happens a major catastrophe will ensue.
    The Yellowstone volcano will eventually explode, according to experts, and upon doing so; most of the area east of it, all the way to the ocean and beyond, may very well descend into an "ice age".
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    The Juan de Fuca plate is a microplate caught like a gear between the North American plate and the Pacific plate. It turns roughly clockwise, creating larger volcanoes in the north than in the south. It moves fairly regularly, and is not sticking. Not a big danger of "The Big One".

    Volcanism, on the other hand, is the bigger danger here. Some volcanoes around here have no vents to relieve pressure. Several are close to Seattle or Portland.

    But by far the largest cause of death around here is the eight month dark and gray winters we get around here. Death by suicide, you see. It takes a certain mindset to cope with that kind of winter.

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    Quote Originally Posted by USFREEDOM911 View Post
    A tectonic plate is dying under Oregon. Here’s why that matters.

    Something was nagging at William Hawley, and it was more about what was missing than what was there.

    As a Ph.D. student at the University of California, Berkeley, Hawley is fascinated with the geologic complexities of the Cascadia subduction zone, a giant fault off the coast of the Pacific Northwest. There, the Juan de Fuca tectonic plate plunges under the North American plate, building strain throughout the region and prompting fears of the massive earthquake that could strike when it releases.

    Hawley, however, was distracted by a peculiar region below central Oregon where it appears that a chunk of the Juan de Fuca plate is missing. He wasn’t the first to notice this gap, but it nagged at the back of his brain. Such a feature must be affecting the surface—and he wanted to know how.

    Now, he might finally have an answer. In a study recently published in Geophysical Research Letters, Hawley and his coauthor Richard Allen suggest that the missing piece is not just a hole, but a tear that’s slowly splitting the plate apart at least 93 miles beneath the surface.

    “I know that this seems like this little tear is a long way down,” Hawley says. But the presence of such a feature could be the root of a number of hazards at the surface, helping scientists more accurately identify future dangers. For instance, as the southern limb of the split rotates away, its motion could be the cause of strong earthquakes that rattle off the coast of southern Oregon and northern California, the new model suggests. Such a tear could also explain a string of curious volcanism that swoops across a broad swath of Oregon.

    What’s more, the study is giving scientists a peek into the final moments of a tectonic plate’s life. The Juan de Fuca is one of the few remaining fragments of the once mighty Farallon plate, which North America began languidly consuming some 180 million years ago as the supercontinent Pangea broke apart. What happens when such plates are swallowed up is still unknown—but it’s a fate that awaits all of the planet’s oceanic plates.

    “What we are looking at right now is the death of an oceanic plate,” Hawley says. (Find our what might happen when Earth’s tectonic plates grind to a halt.)

    Other scientists are greeting the new model with curiosity and excitement, but they also caution that it needs more testing before it can become geologic canon.

    “I think there are certainly good ideas,” says Martin Streck, a volcanologist at Portland State University who specializes in the geologic activity of the Pacific Northwest. “But we may discuss this for some years to come.”

    Earth’s crust is fractured into an interlocking network of tectonic plates, whose slow-motion dance has shaped the surface of our planet. They grind against one another, pulling apart at some edges and colliding in others. These collisions often form what are known as subduction zones, where oceanic plates take the plunge while continental plates ride high.

    Researchers once thought that at any given subduction zone, the diving plate simply curls down into the deep, dropping in a sheet like a curtain, Hawley explains. But scientists have realized that just isn’t the case, based on the data gathered from an increasing number of instruments imaging Earth’s innards—including the thousands of seismometers of the National Science Foundation’s EarthScope project, as well as the onshore and underwater arrays of the Cascadia Initiative, all of which were used in this latest study.

    Now, we know that as one plate dips under another, it can deform, warping and breaking in unexpected ways. How this tortured fate affects the surface, however, is not always clear, particularly as a tectonic plate nears its end. The dying Juan de Fuca plate is a perfect opportunity to study such impacts, in part because it’s not going quietly into the deep, so scientists are closely monitoring the system’s every shiver and burp. (Here’s how we found out that a powerful earthquake split a tectonic plate in two.)

    To study the plate’s subterranean gap, Hawley and Allen first needed to confirm that it really exists and was not just some artifact hiding in the data. The duo constructed a high-resolution look into the subsurface by mapping out the different speeds of seismic waves that 217 earthquakes sent rippling through the region. The speeds of these waves change depending on the temperature and composition of the rock, so they were able to "see" the colder, denser oceanic plate as it sinks into Earth and confirm that part of it is indeed missing.

    With this new high-resolution data on the gap, the duo are effectively saying, “No, really, really. It’s really there,” quips seismologist Lara Wagner of the Carnegie Institution for Science, who has extensively studied the Farallon plate.

    Another piece of the puzzle clicked into place when Hawley and Allen discovered that the position of the tear aligns with a previously identified zone of weakness known as a propagator wake, which cuts through the Juan de Fuca plate exposed at the seafloor and likely continues as it descends into the mantle. The researchers posit that the subducted plate is tearing along this zone of weakness as the southern section of the plate rotates in a clockwise direction, slowly splitting from the northern section of the plate. (Find out how a peeling tectonic plate may one day cause the Atlantic Ocean to shrink.)

    “You’re essentially unzipping these two plates that used to be together,” Wagner says. “But it was a weak zipper—and that zipper is that propagator wake.”

    The motion of this split and twist could also explain the distortion seen—and felt—at the surface off the coast of southern Oregon and northern California, Hawley explains. This southern zone of the Juan de Fuca plate is riddled with earthquake-prone faults—exactly like what you’d expect from the newly proposed model.

    Explosive ideas

    The final piece of the puzzle is the volcanism. A string of volcanoes called the High Lava Plains stretches across southern Oregon and spouts an odd combination of magmas: Some are silica-rich, forming light-colored rocks known as rhyolite, while others are rich in magnesium and iron, forming jet-black rocks known as basalts. A tiny amount also has a composition in between these magma types.

    This is surprisingly similar to the contrasting magmas that long ago erupted from the nearby Yellowstone volcanoes, and the light-colored rhyolites of both systems change in age from one end of the volcanic chain to the other. (Peer into the inner-workings of Yellowstone’s supervolcano in this stunning illustration.)

    Yellowstone’s volcanoes are the result of an underlying magmatic hotspot, which is thought to sit largely stationary as the North American plate slowly drifts to the southwest. This results in a line of eruptions growing progressively older in the same direction.

    “The issue is that it’s going the wrong direction,” Hawley says of the High Lava Plains, with the rhyolitic rocks growing progressively older as you move toward the east. Researchers have previously devised a number of scenarios to explain this oddity, but no solution has been perfect.

    The new model presents another compelling possibility: Intriguingly, the youngest zone of the High Lava Plains sits just above the tip of the tectonic tear. As this tip propagated through the plate’s weak zone toward the west, mantle upwelling might have melted the crust above, resulting in explosions of rhyolitic magma that follow the age progression seen at the surface.

    Tectonic time machine

    “I think it’s a really interesting paper, and it’s really cool seeing another explanation for something that’s anomalous,” says Matthew Brueseke, an igneous petrologist at Kansas State University. But the model still needs to incorporate more information from the chemistry of the rocks, he says. Brueseke is particularly curious to see which trace elements are locked in the rocks, and how that might compare to other regions that sit on top of proposed slab tears. (Learn more about how volcanoes commonly form around subduction zones.)

    For example, past studies hint that similar rips might lurk under the Caribbean island of Hispaniola, as well as near the juncture between the volcanoes of Russia’s Kamchatka Peninsula and Alaska’s Aleutian Islands. By comparing the chemistry of rocks in a range of regions, scientists might get a better grip on their magmatic origins.

    The new model also can’t explain everything about the High Lava Plains, Streck adds. Even if the tear can account for the rhyolitic rocks’ decrease in age from east to west, the basaltic rocks don’t follow a similar trend, with that type of magma seeming to have erupted willy-nilly across the region.

    Still, the latest work presents a compelling possibility for what might be lurking beneath Oregon—and it probes vital questions about the basic processes behind Earth’s geologic churn.

    “In many ways, when we’re looking at these things, we’re looking back in time,” Wagner says. “If we don’t understand how those processes work[ed] in the past, where we can see the whole story and study it, then our chances of seeing what’s happening today and understanding how that might evolve in the future are zero.”
    Interesting post, thanks......
    "There is no question former President Trump bears moral responsibility. His supporters stormed the Capitol because of the unhinged falsehoods he shouted into the world’s largest megaphone," McConnell wrote. "His behavior during and after the chaos was also unconscionable, from attacking Vice President Mike Pence during the riot to praising the criminals after it ended."



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    Quote Originally Posted by Bill View Post
    Interesting post, thanks......
    Everyone is screaming about "climate change" and yet, what's happening with the plates could cause a way bigger disaster that could result in the death of millions and make huge areas uninhabitable for eons.
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    Quote Originally Posted by Into the Night View Post
    The Juan de Fuca plate is a microplate caught like a gear between the North American plate and the Pacific plate. It turns roughly clockwise, creating larger volcanoes in the north than in the south. It moves fairly regularly, and is not sticking. Not a big danger of "The Big One".

    Volcanism, on the other hand, is the bigger danger here. Some volcanoes around here have no vents to relieve pressure. Several are close to Seattle or Portland.

    But by far the largest cause of death around here is the eight month dark and gray winters we get around here. Death by suicide, you see. It takes a certain mindset to cope with that kind of winter.

    I am here to testify. Seasonal depression hit me hard when I first moved here. I remember lamenting that it was like living at the bottom of a dirty goldfish bowl. I was fooled because the first time I came here on business, it was in December. It was sunny and shining. It is incredible what people can adapt to.

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    Into the Night Soil;
    But by far the largest cause of death around here is the eight month dark and gray winters we get around here. Death by suicide, you see. It takes a certain mindset to cope with that kind of winter.
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    Quote Originally Posted by USFREEDOM911 View Post
    Everyone is screaming about "climate change" and yet, what's happening with the plates could cause a way bigger disaster that could result in the death of millions and make huge areas uninhabitable for eons.
    Yep...

    I was born up in the NW but it is only now that ppl living there are realizing just how bad the "big one" would be for them along the sound & out on the islands up into BC......... Not to mention the almost guarantee of tsunami "REPEATS" of the past, that they only pretty recently discovered..........

    I have cousins up there still & they are even talking about it now.........
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    tectonic plate is dying
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    Quote Originally Posted by Controlled Opposition View Post
    I am here to testify. Seasonal depression hit me hard when I first moved here. I remember lamenting that it was like living at the bottom of a dirty goldfish bowl. I was fooled because the first time I came here on business, it was in December. It was sunny and shining. It is incredible what people can adapt to.
    It certainly is! When we submerge for winter, I simply stop looking out the windows. There is nothing to really see. During the entire month of December and January, I put up a lot of Christmas lights to bring SOME brightness to the depths of winter around here.

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    Quote Originally Posted by Bill View Post
    Yep...

    I was born up in the NW but it is only now that ppl living there are realizing just how bad the "big one" would be for them along the sound & out on the islands up into BC......... Not to mention the almost guarantee of tsunami "REPEATS" of the past, that they only pretty recently discovered..........

    I have cousins up there still & they are even talking about it now.........
    Fortunately, most of the Juan de Fuca plate isn't sticking. That's what makes the "big one" possible. It's when it snags, then lets go all at once that makes the "big one".

    We have our earthquakes from time to time, of course. The biggest I've experienced was the 1964 quake and the 2001 quake. I was standing at a bus stop in the 1964 quake. I saw the whole street coming toward me in waves. A yellow jacket's nest was in the bluff behind me. When their nest caved in, guess who they decided to blame it on?

    The 2001 quake broke up the runways at Boeing field and destroyed the old control tower (they were already in the new one fortunately!). That ground sits on fill, and earthquakes hit it like shaking a bowl of pudding.

    The best timed quake we had around here occurred in 2006. Some earthquake experts were in town discussing how to detect and prepare cities for earthquakes. They were having their final dinner before departing for their various home cities in Duvall, a small town east of Seattle. That earthquake hit (a mild one) while they were having dinner...the epicenter was under Duvall! I am convinced God does have a sense of humor! Those guys went home feeling like they just escaped the Twilight Zone!

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    Quote Originally Posted by Into the Night View Post
    It certainly is! When we submerge for winter, I simply stop looking out the windows. There is nothing to really see. During the entire month of December and January, I put up a lot of Christmas lights to bring SOME brightness to the depths of winter around here.
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    Quote Originally Posted by Into the Night View Post
    Fortunately, most of the Juan de Fuca plate isn't sticking. That's what makes the "big one" possible. It's when it snags, then lets go all at once that makes the "big one".

    We have our earthquakes from time to time, of course. The biggest I've experienced was the 1964 quake and the 2001 quake. I was standing at a bus stop in the 1964 quake. I saw the whole street coming toward me in waves. A yellow jacket's nest was in the bluff behind me. When their nest caved in, guess who they decided to blame it on?

    The 2001 quake broke up the runways at Boeing field and destroyed the old control tower (they were already in the new one fortunately!). That ground sits on fill, and earthquakes hit it like shaking a bowl of pudding.

    The best timed quake we had around here occurred in 2006. Some earthquake experts were in town discussing how to detect and prepare cities for earthquakes. They were having their final dinner before departing for their various home cities in Duvall, a small town east of Seattle. That earthquake hit (a mild one) while they were having dinner...the epicenter was under Duvall! I am convinced God does have a sense of humor! Those guys went home feeling like they just escaped the Twilight Zone!
    LOL, sounds like an event you will never forget. As a kid I was attacked by yellow jackets in Idaho, & I can still remember it well..

    I wasn't aware of 2001 but I have been through a few. I live about 2 hours from the SF bay & seen the one in 89 roll just like that, almost almost like waves rolling in.
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    Quote Originally Posted by USFREEDOM911 View Post
    Everyone is screaming about "climate change" and yet, what's happening with the plates could cause a way bigger disaster that could result in the death of millions and make huge areas uninhabitable for eons.
    I know, we should just let the planet cook and die off because tectonic plates

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