@misc{indiciaeabcabf511286,
  title = {Amateur radio operators help fill earthquake donut holes},
  author = {David J. Wald and Vince Quitoriano and Oliver Dully},
  year = {2021},
  doi = {10.1029/2021eo155013},
  url = {https://pubs.usgs.gov/publication/70218289},
  note = {Source identifier: 70218289}
}