8Cooper J D. Letter to editor, San Francisco Daily Evening Bulletin, Nov. 3, 1968.
9Kamigaichi O, Saito M, Doi K, et al. Earthquake Early Warning in Japan: Warning the General Public and Future Prospects[J]. Seismological Research Letters, 2009,80 (5) : 717-726.
10Nakamura H, Horiuehi S, Wu C J, et al. Evaluation of the real-time earthquake information system in Japan [J ]. Geophysical Research Letters. 36( L00B01),2009.
