Distance and direction of nearest 20 strong motion seismographs from earthquake. Such seismographs are of interest to structural engineers. Earthquake is 54.3 km N of John Day Dam, OR. (ACOE) 73.8 km NNE of The Dalles Dam, OR. (ACOE) 90.8 km WSW of 200 West (H2W) 97.8 km WSW of 100-K Area (H1K) 98.0 km WSW of 200 East (H2E) 106.6 km WSW of 400 Area (H4O) 111.0 km W of 300 Area (H3O) 113.0 km WNW of McNary Dam, OR. (ACOE) 130.7 km NW of Willow Creek Dam, OR.(ACOE) 137.8 km ESE of Mossy Rock Dam, WA., Cowlitz R. (ACOE) 140.4 km SE of Mud Mountain Dam, WA. (ACOE) 140.8 km W of Ice Harbor Dam, WA. Snake R. (ACOE) 144.4 km E of Toutle River Dam, WA. (ACOE) 145.3 km SE of Howard Hanson Dam, WA. (ACOE) 157.3 km SE of RAW - Raver BPA SMO-IDS20 162.5 km ENE of RBO - SMO Rocky Butte, OR (USGS) 164.5 km ENE of Vancouver, WA. VA Hospital Bldg. #4 (VA) 169.0 km SSE of ELW - EchoLakeBPA SMO-IDS20 170.5 km ENE of HAO - SMO Harrison Substation (USGS) 171.3 km SE of McChord AFB, WA. Passenger Term. (USGS)