@misc{indiciaea48e6cfc14ea,
  title = {The fortnightly tide and the tidal triggering of earthquakes},
  author = {S. Hartzell and T. Heaton},
  year = {1989},
  doi = {10.1785/bssa0790041282},
  url = {https://pubs.usgs.gov/publication/70015511},
  note = {Source identifier: 70015511}
}