@misc{indiciaec21d32ed32f4,
  title = {Probabilistic earthquake acceleration and velocity maps for the United States and Puerto Rico},
  author = {S. T. Algermissen and D. M. Perkins and P.C. Thenhaus and S.L. Hanson and B.L. Bender},
  year = {1990},
  doi = {10.3133/mf2120},
  url = {https://pubs.usgs.gov/publication/mf2120},
  note = {Source identifier: mf2120}
}