@misc{indiciae13c15ffa1650,
  title = {Digitized strong-motion accelerograms of North America through 1986},
  author = {L. C. Seekins and A. G. Brady and C.S. Mueller},
  year = {1989},
  doi = {10.3133/ofr8983},
  url = {https://pubs.usgs.gov/publication/ofr8983},
  note = {Source identifier: ofr8983}
}