@misc{indiciae4b4576cf99c6,
  title = {Echo-sounding method aids earthquake hazard studies},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1995},
  doi = {10.3133/fs13295},
  url = {https://pubs.usgs.gov/publication/fs13295},
  note = {Source identifier: fs13295}
}