Melbourne's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Melbourne is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. That puts Melbourne in the 9th percentile nationally for seismic hazard - higher than 9% of the 4,875 US cities USGS was checked against here.

How Melbourne compares

The raw figures: peak ground acceleration 0.026g, short-period spectral response 0.055g, 1-second spectral response 0.032g. Among 228 Florida cities in this dataset, Melbourne ranks 99 for seismic hazard, the 57th percentile within the state. About 87,561 people live in Melbourne, Florida.

Retrofit economics for Melbourne

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Florida. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

What this means for insurance

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Melbourne address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Melbourne's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.