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Salt Lake Temple: Jack and Bore video

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Yesterday, the church newsroom released a video that goes over the jack and boring under the Salt Lake temple.

I was amazed to learn that they are doing the boring by hand.  A person is sent inside of the 4' diameter pipes to dig out the rock.  Then, after they've dug out some rock, they sit in the pipe while it is jacked further in to ensure that the pipe stays straight.  They tried to use a boring machine but they had problems keeping it straight because of large rocks under the temple.

This video really gave a good rundown on how the base isolation system is going to work.

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Deseret News has an article that includes the above video as well as other photographs of the construction.  It has pictures from the main plaza, northwest section of the temple square (where the north visitor center used to exist), and the church office plaza.


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1 hour ago, katherine the great said:

I’m glad they’re modifying it to make it more earthquake proof. I also hope they’re paying that person in the pipe a really good salary and pension!

I thought the same thing. Not a job I want…or could do for that matter even if I did. 

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Have you not heard of Julie Rowe’s prediction of the off the charts earthquake that will cause the SL temple to be inundated?  No doubt the brethren are listening to her divine inspiration (she did predict they would be apologizing profusely for excommunicating her) and going all out to prevent that.

Edited by Calm
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9 hours ago, blackstrap said:

Do they know something  that the USGS doesn't ? 


Many of the major old buildings in Salt Lake have been receiving base isolation systems to protect against earthquakes.

Utah Capital Building - https://utahstatecapitol.utah.gov/explore/restoration-project


The project began in 2004, and by the end, 265 seismic base isolators were installed underneath the Capitol to help improve safety and protect against earthquake damage.

Salt Lake City and County Building - https://geology.utah.gov/popular/places-to-go/geologic-guides/building-stones-of-downtown-salt-lake-city/stop-22/


The building was badly damaged by an earthquake in 1934, so to help protect it from future earthquakes, the structure now sits upon a base-isolation system of rubber and steel “shock absorbers” set between the foundation and the ground. At the time of its completion in 1989, the $30 million retrofit was the world’s first application of seismic base isolation in the restoration of a historical structure.


And the wiki page links to a ksl article with the title "5 biggest earthquacks ever to happen in Utah".  The last item on the list says:


5. The big one (that has yet to strike). According to Professor Bart Kowallis of the Department of Geological Sciences at Brigham Young University, there are 10 fault segments running along the Wasatch Fault. Each fault segment has been trenched and dated with Carbon-14 analysis to reveal 3-4 events on each segment. Surveys of each segment indicate one big earthquake about every 500-2000 years.

Analysis of all fault segments running through the Wasatch Front suggests the chance of a major earthquake event on any fault to be one every 200 years on average. Almost all of the segments of the faults have had a major earthquake within the last 500 years. There are two exceptions: the Salt Lake segment (1000 years ago) and the Brigham City segment (over 2000 years ago). To put this in perspective, since 1971, there have been 7 major earthquakes along the San Andreas Fault in California. Perhaps Salt Lake Valley is possibly overdue for a quake after all.

The Wasatch front is expecting a "big one" which will probably be at least 7.0.  It would be the biggest earthquake in the Wasatch front in 200+ years.

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Is it no longer commonly known that the SLC valley is due for a big earthquake?  My 25 years growing up there had that as common knowledge, taught from elementary school through college.  They told me my drive to high school, that hill on 3900 S where it crosses Highland Drive and gains 200 feet, was part of the Wasatch fault line.

I grew up with stories of liquefaction - where a big enough earthquake would turn 5 feet of topsoil into a fluid, and everything would slide down hill.  

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