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- Apr 3, 2019
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My family was at our beach house in Oxnard, and while we children slept through the tsunami warning, my parents were debating whether or not to evacuate inland -- meaning go back to our home in an inland valley. They stayed, and Crescent City was hit be a tsunami.In 1964 as much as 12,000 square miles of the earth's surface was lifted from three to eight feet. Which is what created the devastating tsunami in 1964.
But i feel fineBlinded by science it's the end of the world as we know it.
I visited Chile three years ago and visited Valdivia several years ago where the giant earthquake hit in the early 1960s. There is still ruins in Valdivia from the earth quake.My family was at our beach house in Oxnard, and while we children slept through the tsunami warning, my parents were debating whether or not to evacuate inland -- meaning go back to our home in an inland valley. They stayed, and Crescent City was hit be a tsunami.
Within a week or so, we could see the activity at the Port Hueneme Navy Construction Battalion Base -- the SeaBees were going to Alaska to help with the quake relief and repair.
We've had our share of major quakes in Southern California, but not one lasting anywhere near four minutes (must seem like an eternity!) and nothing as strong as 8+ in more recent times.
I'm in a designated tsunami zone, but because of local conditions in the Santa Monica Bay, the expectations of one reaching here is small. Not so for other beaches on the So Cal coast.
Chile has suffered a number of devastating earthquakes in this century, the worst registering 8.8, 8.3, and 8.2 respectively.
The Pacific Rim makes life exciting, not necessarily in a good way.
Really?Blinded by science it's the end of the world as we know it.
It's a joke, two songs combined into one sentence.Really?
How so?
The ground opening up with crevasses during an earthquake is a common occurrence in Alaska. This was from the November 30, 2018 magnitude 7.1 earthquake whose epicenter was just three miles from my home:I talked to a guy who was in Alaska for the 1964 quake. He said it looked just like the movies with crevasses opening up in the ground. Him and his mom clung to a tree in the yard until it was over.
Is there a reason for this? Does this depend on a certain type of soil?The ground opening up with crevasses during an earthquake is a common occurrence in Alaska.
The Susitna and Matanuska Valleys are filled with several hundred feet of glacial silt and clay. So liquification is a factor, and the reason behind the large cracks. The last photograph in my post above is a good example of the ground radiating out in all directions, like a ripple on a pond that was frozen in time just a few seconds after being created, and the ground dropping by about six feet in the center.Is there a reason for this? Does this depend on a certain type of soil?
Our nightmare is liquefaction, not crevasses.
All the quakes that I have experienced have been while living in an area with alluvial soil, but no crevasses, perhaps because the quakes were not in the 8+ range. (There was wide-spread damage to water, gas, and sewer lines.) Also, in the 1994 Northridge quake, the San Fernando Valley floor only rose a few inches, instead of feet.The Susitna and Matanuska Valleys are filled with several hundred feet of glacial silt and clay. So liquification is a factor, and the reason behind the large cracks.
All the earthquakes I've experienced since moving to the valley have been rolling
I moved to Alaska from Reseda in 1991, so I missed out on the Northridge quake, but I was living in Palmdale during the 1971 6.5 magnitude Silmar quake. I remember watching the streets of Palmdale rippling like waves during the aftershocks.All the quakes that I have experienced have been while living in an area with alluvial soil, but no crevasses, perhaps because the quakes were not in the 8+ range. (There was wide-spread damage to water, gas, and sewer lines.) Also, in the 1994 Northridge quake, the San Fernando Valley floor only rose a few inches, instead of feet.
Same here until 1994, when there was vertical thrusting instead of horizontal waves. I distinctly remember standing in a doorway and having the floor coming up to hit my bare feet. The majority of Los Angeles area seismic reinforcements had been done to protect against lateral shaking, and consequently an overpass of a major freeway collapsed. Local building codes were updated, and CalTrans started more retrofitting of freeways.
Thanks for the discussion.
I was in the SF Valley for the Sylmar quake (went to Birmingham High School) -- so much water sloshed out of my parents' pool. Trying to get news on the radio about what had happened, I found a San Diego station. The announcer was in a panic saying that a major quake had hit Los Angeles and knocked the radio stations off the air. I fell apart hearing the announcement -- I was OK until I heard what I had experienced put into words.I moved to Alaska from Reseda in 1991, so I missed out on the Northridge quake, but I was living in Palmdale during the 1971 6.5 magnitude Silmar quake. I remember watching the streets of Palmdale rippling like waves during the aftershocks.
I periodically check the US Geological Service for latest quakes, especially after we've had one locally. I notice that something nearly always shows up for Alaska, usually around the Aleutian Islands.A lot of that has to do with the 70+ active volcanoes in Alaska. Most of them are located in the Aleutian Islands
Like in Pompeii before Vesuvius erupted . . .The Iliamna volcano, for example, had 44 quakes this past week with the largest being a magnitude 6.5, so they have increased the threat level.
The ash we have here is from wildfires in the Santa Monica Mountains. None so far this year - knock wood.I have been covered in ash by both Mount Redoubt and Mount Spurr eruptions in the last 30 years.
Since I live in a forest, my primary concern are wildfires. So I regularly check their status during the Summer. Volcanoes are low on my list of concerns, but I do check to see if threat levels have changed periodically. I can't really do anything about earthquakes, other than hope if they are bigger than 7.0M the epicenter is more than 100 miles away.I periodically check the US Geological Service for latest quakes, especially after we've had one locally. I notice that something nearly always shows up for Alaska, usually around the Aleutian Islands.
ADOT must've been pissed.The ground opening up with crevasses during an earthquake is a common occurrence in Alaska. This was from the November 30, 2018 magnitude 7.1 earthquake whose epicenter was just three miles from my home:
View attachment 67345745View attachment 67345746View attachment 67345747
M7.1 November 30, 2018 Anchorage Earthquake | U.S. Geological Survey
A magnitude 7.1 earthquake struck north of Anchorage, Alaska, on November 30, 2018, at 8:29 a.m. local time (17:29:28 UTC).www.usgs.gov
It is just part of the job. Fixing pot-holes, frost-heaves, and fissures cause by earthquakes. They have gotten very good at it as well. All the damage to the roads in the photos above were repaired and being used by regular traffic within 72 hours. It was fortunate that no bridges collapsed, or it would have taken a great deal longer.ADOT must've been pissed.
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