13/02/12 13:05:06.35 M0QWzTA0
URLﾘﾝｸ(online.wsj.com)
The U.S. Geological Survey said it detected seismic activity with a magnitude
of 4.9, bigger than the seismic activity produced in North Korea's previous
two blasts. A report by South Korea's Yonhap News Agency said the quake
registered a magnitude of 5.1.
Both of the previous detonations were considered small by the standards of
nuclear testing in other countries.
The first one in 2006 produced a tremor that measured a magnitude 4.1, and
analysts in the U.S. later estimated its explosive force at less than one
kiloton. The second one in 2009 produced a seismic tremor of 4.7 and an
explosive force of about two to six kilotons, according to estimates by U.S.
seismic and geological experts.
最初の核爆発、M＝4.1 推定爆発量＜1キロトン
二回目核爆発 M＝4.7 推定爆発量＝２～６キロトン
今回の核爆発 M＝5.1