The How And Why Of Earthquakes

Discussion in 'Science & Nature' started by Babs Hunt, Apr 19, 2016.

  1. Martin Alonzo

    Martin Alonzo Veteran Member
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    Yvonne Earthquakes are very unpredictable and the science on earthquakes is questionable. I live in an earthquake area not saying I expect one. One hit Puerto Plata a few years back that cracked the walls in my cement block walls I needed to have them put in special reinforcement in case it happened again. We live on the North coast of the DR and we felt the earthquake that hit Puerto Prince Haiti it is on the south part of Haiti. When we had the earthquake here people would not go back into their homes in fear of another. I had to educate the locals on earthquakes 95% of the time the first is the most deadly and then you have aftershocks that are less intense. So I would tell them if you survived the first and did not have damage to your home you ere petty safe. Lots of people make a big fuss over earthquake swarms I have seen earthquake swarms north of Puerto Rico for 15 years and still nothing even Puerto Rico has daily earthquakes. Yellow stone have been over due for a gigantic earthquake for hundreds of years and ever so often someone will bring that up and start a panic all over again. Here is a earthquake map of just the last 7 days north of Puerto Rico and this has been the same for 15 years.
     
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  2. Martin Alonzo

    Martin Alonzo Veteran Member
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  3. Tim Burr

    Tim Burr Very Well-Known Member
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    Experienced a 7.75 quake on the Island of Shemya, AK Feb. 1, 1975.
    We lost the only way on or off the island, the runway, for quite awhile.
    Lots of watermain breaks. Put a damper on us watching the 'other guys'
    during the cold war.

    Was living in Moreno Valley for the Northridge quake in 1994.
    That one throw us out of bed at 4:30 am and made the house unlivable.

    Think I'm pretty much done with those things. ( I hope... ):)
     
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  4. Gloria Mitchell

    Gloria Mitchell Very Well-Known Member
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    Never been in a earthquake. Once as a child felt what they called a tremor. However about 25 miles from where we live they have been having earthquakes fairly regular . I know someone who works at the oilfields in various areas. He over sees fracking machinery. He told me without doubt that fracking enables the cause if earthquakes. If you could see what they are doing and pumping the earth full of...you to would have no doubt.
    He hates this job that he and his crew work sometimes 36 to 40 hours straight.Which is unlawful but they get away with it. Once he gets some personal issues taken care of he hopes to find another job.
     
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  5. Bill Boggs

    Bill Boggs Veteran Member
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    I live in Oklahoma and we have many small quakes, the largest was a 5.3 or 5.4 but our quakes are not like the major quakes in the mountains or along the coasts. Ours are not major faults. I was in a quake in California on the fourth floor of a hotel, sitting a a table, sipping a vodka tonic planning my work schedule for the following day, when the glass started vibrating toward the edge of the table. I put it back studying a map of the LA area. the glass vibes to the edge of the table and I caught it before it fell to the floor. I looked up and my light fixture was swaying about three foot ark. I hurried down the stairs to the bar. Everyone was having a good time. Everyone laughed at me.

    I was on a bridge inTokyo, Japan, standing on a river bridge in 1953 when the bridge started shaking, I looked around to see everyone running off the bridge, I don't know how large it was but even armed forces radio was talking about it. I suppose I'd not like to live in California.

    I don't know the science of these tectonic plates but I thought when one tried to dive under another or did, it could cause a quake. Many others on here have a better grasp than I.
     
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    Last edited: Jul 6, 2017
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  6. Yvonne Smith

    Yvonne Smith Greeter
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    It appears that they are doing another large-scale earthquake drill in Western Washington, and maybe others on the west coast. I know that they have been preparing for a large quake that could happen anywhere from California to Alaska, and it seems like they are doing more of the drills in case of one.
    Last spring was a large drill that involved several states , including Idaho, where my son lives. Not that they think the earthquake will affect them that far away; but that the quake, when it happens, will so devastate the western part of the state that all of the emergency workers will have to be flown in from other surrounding states.
    Both I-90 and I-5 , the main freeways for Washington , would be shut down from the disaster, and there would also be flooding, and probably a tsunami as well.
    They are having another preparedness drill, and one always wonders if they know something the rest of us don't know.

     
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  7. Chrissy Cross

    Chrissy Cross Veteran Member
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    Ive lived in California for 14 years and have felt 2, they were less than a 5. It was more of a shifting than a shaking if I recall.
    I used to have an earthquake site in my favorites and would check it occasionally. There are earthquake every day..just not very big.

    I quit checking after a few years and will only look if I felt something.

    Guess we're due for a big one but it's something I don't worry or think about.

    In Fresno I'm far from the ocean and I also don't use I-5 or I-90.
     
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  8. Ted Richards

    Ted Richards Well-Known Member
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    Yes a fairly big one in 1956 in San Diego when I was serving in the Navy. Then a few minor ones when we lived in the Los Angeles area. Now I live in north-central B.C. and a few years ago we felt one here. Turns out the epicentre was 200 miles west of us off Haida Gwai (formerly Prince Charlotte Islands). Yep, that area is in the Ring Of Fire too.

    Then there are the isolated crust fractures such as:
    1811–12 New Madrid earthquakes - Wikipedia
    https://en.wikipedia.org/wiki/1811–12_New_Madrid_earthquakes
    The 1811–12 New Madrid earthquakes were an intense intraplate earthquake series beginning ... They, as well as the seismic zone of their occurrence, were named for theMississippi River town of New Madrid, then part of the Louisiana ...
    That was a really nasty one and could happen again.
     
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  9. Ken Anderson

    Ken Anderson Greeter
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    During my twelve years in California, I never noticed any of the earthquakes we had. Once my brother called from Michigan to ask if I was alright. Seems he had heard the news about an earthquake that affected the part of California where I was living at the time. However, I was watching television and hadn't noticed the quake. Only after he called, I could recall having felt something but it could have been a large truck going by. I didn't think anything of it.
     
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  10. Yvonne Smith

    Yvonne Smith Greeter
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    It sounds like the Yellowstone volcano is starting to wake up more again. They are reporting that there is a 100 foot crack along a solid rock wall in Wyoming, in the area around Jackson Hole, which is south of Yellowstone Park.
    According to the new article, it is possible that Yellowstone could start spewing out lava like the volcano in Hawaii has been doing for the last few months, only the Yellowstone one is 2,000 times larger than the Kilauea volcano is.

    http://halturnerradioshow.com/index...e-near-grand-teton-emergency-tourist-closures
     
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  11. Don Alaska

    Don Alaska Very Well-Known Member
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    The largest earthquake I have been through was in 2002.
    https://en.wikipedia.org/wiki/2002_Denali_earthquake

    There was highway damage and our house floors and walls rolled. I was sitting at the dining room table, but my wife was on the toilet and was thrown of (embarrassment!) and our sons and their friends who were riding bikes on our dirt road were thrown off their bikes. We got a small crack in the garage slab/foundation, but no other damage. I have also been through two volcanic eruptions since I moved here. The biggest danger at the moment to North America is the Cascadia Fault off the coast of Oregon.
     
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  12. Don Alaska

    Don Alaska Very Well-Known Member
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  13. Martin Alonzo

    Martin Alonzo Veteran Member
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    The last solar minimum the volcanoes increased we are now going into a new solar minimum so this is to be expected. Another sign of a solar minimum is global cooling/ice age
    Mystery of Antarctica’s Ice (663)
     
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  14. Don Alaska

    Don Alaska Very Well-Known Member
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    Martin, this is all true and mysterious. It has mystified me for quite a number of years, and I get reports from the northern cast of Alaska about pack ice onshore in July this year, almost unheard of at this time of year while all I hear in the media is that the ice pack is disappearing. I hadn't heard of a link between the solar cycles and volcanic activity, but it fits with the "not by fire, but by ice" theory of increased magma activity preceding ice ages. As I have said in previous posts, we are seeing glacier growth at higher elevations, but retreat at sea level. This is probably indicative of a cooler atmosphere and warmer water temperatures. Climate warming historically has led to increased food supplies, and population increases, while cooling has lead to crop failures and population collapses due to starvation. Cooling is to be feared much more than warming. The term "Climate Change" is just silly, as climate is changing all the time and has done so for as long as we can determine climate.
     
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