Photographers in Greenville SC – Rebecca and Bill’s Wedding at Clemson Botanical Gardens. January 4, Author, admin #Comments. 4-7-
There is no "average" 9.0 earthquake
Earthquakes that large are so rare that each one is sui generis.
And you are confusing earthquakes with the (sometimes) resultant tsunamis. The seawalls that protect most coastal settlements in Japan guard against tsunami damage, not damage.
Besides all the tsunami videos on Youtube there are also endless videos of the earthquake itself. The interesting thing is that there were very few deaths or injuries from the quake per se; it was the following tsunami that was so murderous.
Google Streetview is updated frequently enough that it's now hard to find evidence of earthquake damage, but in the small city of Namie, in the Fukushima exclusion zone you have a ghost town where there has been no remediation of earthquake damage.
In e-strolling around Namie, the few wrecked buildings you see appear to be older buildings; there's little significant damage to modern buildings.