I am in the planning phase of replacing my back lawn with
cinder block garden boxes and pavers and/or rocks.
Problem: we have *a lot*, about 30 a day you can't feel,
earthquakes around these parts (North Western Nevada).
I would hate to fill one of these things with dirt and
have a larger shaker come through and dump all my dirt
on my rocks/pavers.
How to I earthquake proof a cinder block raised garden
I was looking at the 8x8x16. Pile them 3 high for 2 feet height.
I will be filling it with organic dirt and compost from
Our typical earthquake is very small. A good detector is to
pull a TV rabbit ear all the way out and make the tip about 1/4"
from the wall. You will hear it tapping off and on all night long.
Stacked only 3 units high and back filled with what you use..... I
seriously doubt there is any possibility of failure.
If you're still worried, assemble your raised beds with running bond &
Buy some sch 80 1/2" PVC pipe and drive a PVC stake into every other
or every third block and into the ground about 6", back fill with
native soil or your mix.
If you want to do some experimentation... stack some blocks on a piece
of 3/4" plywood, start with 3 units high. Check to see how high you
have to lift one edge of the plywood to get the stack to begin to
topple. Increase the stack height.
The angle you need to start the stack to topple gives an indication of
the stability.... you will see that a 3 unit stack is very stable. 5
or 6 unit stack much less, a 8 or 9 unit stack is scary.
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