@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040986,
 author = {Omori, F.},
 issue = {1},
 journal = {Bulletin of the Imperial Earthquake Investigation Committee},
 month = {Feb},
 note = {application/pdf},
 pages = {1--4},
 title = {On the Estimation of the Time of Occurrence at the Origin of a Distant Earthquake from the Duration of the 1st Preliminary Tremor observed at any place},
 volume = {1},
 year = {1907}
}