@misc{indiciae9609ff6ac6ba,
  title = {A real-time seismic amplitude measurement system (RSAM)},
  author = {T.L. Murray and E.T. Endo},
  year = {1989},
  doi = {10.3133/ofr89684},
  url = {https://pubs.usgs.gov/publication/ofr89684},
  note = {Source identifier: ofr89684}
}