Got this from one website, who got it from another. You might as well just call this an M8 that ripped along the coast. Forget the 'double tap' drama. Damage was related to peak ground velocity (pgv) but no records yet. They are just estimating.
I am interested in horrible damage from a measly 20 cm/s. That happens with no steel and slime concrete. If somebody got 100 cm/s and only lost the outer bricks, then that is amazing. However, in general, I'm just seeing old Soviet construction here. No steel, no cement powder.
I'm wondering what the minimum concrete strength for a building to just stand up. Good concrete is about 5,000 psi, and a 'one bag mix' for fill might be 500 psi. I suspect they used that.
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