This is a fun article, showing the original maps. If we were to take the threat of a big earthquake seriously, then we would look at these old maps. Hydraulic fill is just dirt dumped into water, and is the worst for earthquake amplification. When we have our m7, nothing on it will stand.
These maps show how the natural fill from the lake currents stand in relation to the modern city. All the big towers and condos have foundations that go down to rock, so they should be ok, except for soft-story condos.
I especially like how unfilled the islands were. Early settlers stole all the boulder lag from the Scarborough Bluffs, and this added greatly to the islands.
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