@article{Physics.5.137,
  title = {Subterranean Sound Waves from Projectile Impact},
  author = {Schirber, Michael},
  journal = {Physics},
  volume = {5},
  issue = {},
  pages = {137},
  numpages = {1},
  year = {2012},
  month = {Dec},
  doi = {10.1103/Physics.5.137},
  url = {http://link.aps.org/doi/10.1103/Physics.5.137},
  publisher = {American Physical Society}
}