TY  - RPRT
TI  - Orientation-independent measures of ground motion
AU  - D.M. Boore
AU  - Jennie Watson-Lamprey
AU  - N. A. Abrahamson
PY  - 2006
DO  - 10.1785/0120050209
UR  - https://pubs.usgs.gov/publication/70028497
ID  - 70028497
ER  -