At the time of construction, Cheomseongdae dug 1.5m of the floor and put sand and gravel in it. It is based on the fact that the ground of the particle type is less shaky than the hard ground. In addition, stone, sand, and gravel were filled in Cheomseongdae. This is a seismic design called 'plate axis' that absorbs seismic waves.
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This comment is wonderful! Thank you for adding the important information to the mini history lesson.
Wow ... this is very detailed. Thank you :) <3<3<3 👍👍👍👍
thank you for your explanation
Don' give me that. It's the world all we make.
Impressive mate, thanks for this
Wow, How in the the heck did you know that!?? Very interesting. We like to build recording sutios on sand to stop sound transfer, especially lower freqs. Thanks!
Excellent explanation