I have not downloaded HAZUS 3.0 yet and am currently using ArcGIS 10.3.1 on my machine. I would like to know if HAZUS 3.0 runs on ArcGIS 10.3.1 or if not any alternatives?
From the Hazus Help Desk Resource and Solutions Page, a question asking for compatibility is mentioned in the FAQ section:
Q. What versions of ArcGIS is Hazus-MH 3.0 compatible with?
A. Hazus-MH 3.0 is compatible with ArcGIS 10.2.2.
There is no mention of ArcGIS 10.3.1.