Harrison, AR: what USGS's seismic model says

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Harrison in Seismic Design 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 Harrison in the 72th percentile nationally for seismic hazard - higher than 72% of the 4,875 US cities USGS was checked against here.

How Harrison compares

The raw figures: peak ground acceleration 0.124g, short-period spectral response 0.25g, 1-second spectral response 0.121g. Among 68 Arkansas cities in this dataset, Harrison ranks 37 for seismic hazard, the 46th percentile within the state. About 13,723 people live in Harrison, Arkansas.

Retrofit economics for Harrison

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

Insuring against this, not just retrofitting

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 Harrison address.

More on how this number was built

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