South Charleston's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, South Charleston is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. That puts South Charleston in the 50th percentile nationally for seismic hazard - higher than 50% of the 4,875 US cities USGS was checked against here.

South Charleston by the numbers

USGS's underlying values for South Charleston: 0.08g peak ground acceleration, 0.153g at short period, 0.064g at 1 second. Within West Virginia alone, South Charleston ranks 6 of 26 cities by seismic hazard - the 80th percentile in-state. South Charleston has a population of about 13,177.

Retrofit economics for South Charleston

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by West Virginia specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in West Virginia.

Insuring against this, not just retrofitting

A South Charleston homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where South Charleston's figures come from

South Charleston's Category B and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category B does and doesn't tell you about South Charleston.