@misc{indiciae37ad1431abbd,
  title = {Predicting earthquakes by analyzing accelerating precursory seismic activity},
  author = {D. J. Varnes},
  year = {1989},
  doi = {10.1007/bf00881603},
  url = {https://pubs.usgs.gov/publication/70015489},
  note = {Source identifier: 70015489}
}