Seismic Reflection Image along I-64

Pratt et al., 1988

Coruh et al., 1988

Ground acceleration at the North Anna Power Stationduring the August 23rd 2011 earthquake

Graph by Martin Chapman, Va Tech

Ground acceleration at the North Anna Power Stationduring the August 23rd 2011 earthquake

Graph by Martin Chapman, Va Tech

Peak ground acceleration 260 cm-2

or 0.26 g or 26% of gravity

1971 Report for VEPCO “that the maximum horizontal ground acceleration… at the site due to such a shock would be no more than 12% of gravity”

shaking too strong for instrument

55 km from epicenter

127 km from epicenter

193 km from epicenter

231 km from epicenter

time (seconds)

Shaking in Virginia

VTSO

Shaking Across USA

C. Bailey & U. South Carolina

Felt Shaking

USGS

Epicenter, August 23 Mainshock

National Earthquake Hazard Map

USGS

Fault Motion

Aftershocks at Depth

R. Herrmann

slice along N120˚E

Louisa County

VA DMME photos