@misc{indiciae1c7009f5b9d7,
  title = {Historical seismic activity in the central United States},
  author = {William H. Bakun and Margaret G. Hopper},
  year = {2004},
  doi = {10.1785/gssrl.75.5.564},
  url = {https://pubs.usgs.gov/publication/70239787},
  note = {Source identifier: 70239787}
}