Monroe's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Monroe is Category C. Moderate seismic hazard. Code adds irregular-building restrictions and requires bracing of some nonstructural components (e.g. tall shelving, water heaters) in addition to structural detailing. That puts Monroe in the 71th percentile nationally for seismic hazard - higher than 71% of the 4,875 US cities USGS was checked against here.

How Monroe compares

The raw figures: peak ground acceleration 0.111g, short-period spectral response 0.215g, 1-second spectral response 0.086g. Among 147 North Carolina cities in this dataset, Monroe ranks 19 for seismic hazard, the 88th percentile within the state. About 40,054 people live in Monroe, North Carolina.

What a retrofit costs in Monroe

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

Earthquake insurance for a Monroe home

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 Monroe address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Monroe'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.