@misc{indiciaec1a9c78bb513,
  title = {Response spectra from the 1989 Loma Prieta, California, earthquake regressed for site amplification, attenuation, and directivity},
  author = {J.L. Boatwright and L. C. Seekins},
  year = {1997},
  doi = {10.3133/ofr97858},
  url = {https://pubs.usgs.gov/publication/ofr97858},
  note = {Source identifier: ofr97858}
}