Note about abbreviations used to refer to categories of seismic risk

To facilitate the flow of reading of some of the blog posts, I will be using the following abbreviations to refer to classes of seismic risk:

Class 1 seismic risk that pose a public threat	C1+
Class 1 seismic risk	C1
Class 2 seismic risk	C2
Class 3 seismic risk	C3
Class 4 seismic risk	C4
Class of Urgency 1	U1
Class of Urgency 2	U2
Class of Urgency 3	U3
Consolidated building	CSLD