@misc{indiciae569fa4c90f63,
  title = {Historical unrest at large calderas of the world},
  author = {Christopher G. Newhall and Daniel Dzurisin},
  year = {1988},
  doi = {10.3133/b1855},
  url = {https://pubs.usgs.gov/publication/b1855},
  note = {Source identifier: b1855}
}