Well to reply to the above. Most of the buildings in Petrinja are older than California, most of them built during the Austro-Hungarian period, ransacked by 3 armies in two world wars and our War of Independence.
I am somewhat familiar with basic US residential building codes and find the idea behind some reasoning fascinating and purposeful at the same time terrifying as most family homes in your area would not survive one bad "Bura" wind season.
The area hit was not seismically active in the last 100 years so the build techniques did not have to account for that, only for the usual ottoman or axis etc. threat. I guess each country and region builds with its average and usual environmental threats in mind. For that location usually being invading or withdrawing armies unfortunately.
Epicentre was almost in the residential area and the followup quakes are moving in line of a faultline thought to be inactive for almost a century.
I'd like to thank all of members expressing support and the show sympathy towards our people.