@misc{indiciae3989bd6210f3,
  title = {Focal mechanisms of western Washington earthquakes and their relationship to regional tectonic stress},
  author = {Li Ma and Robert S. Crosson and R.S. Ludwin},
  year = {1991},
  doi = {10.3133/ofr91441d},
  url = {https://pubs.usgs.gov/publication/ofr91441D},
  note = {Source identifier: ofr91441D}
}