## 2017년 9월 3일 일요일

### earthquake M 6.3

M 6.3 Explosion - 22km ENE of Sungjibaegam, North Korea
https://earthquake.usgs.gov/earthquakes/eventpage/us2000aert#executive

국내 보도에서는 5차 실험 대비 10배 전후라고 한다.
그런데 usgs에 따르면 조금 다르다.

https://en.wikipedia.org/wiki/Richter_magnitude_scale
The energy release of an earthquake,[13] which closely correlates to its destructive power, scales with the  3⁄2 power of the shaking amplitude. Thus, a difference in magnitude of 1.0 is equivalent to a factor of 31.6 ({\displaystyle =({10^{1.0}})^{(3/2)}}) in the energy released; a difference in magnitude of 2.0 is equivalent to a factor of 1000 ({\displaystyle =({10^{2.0}})^{(3/2)}}) in the energy released.

진도 2 차이에 에너지는 1000배 차이.
진도 1 차이에 에너지는 31.6배 차이.

5차 실험 5.3
6차 실험 6.3

딱 1차이.
에너지는 31.6배 차이.

5차가 10 k톤이면 6차는 300 k톤.
40 k톤이면 1.2 M톤.

https://en.wikipedia.org/wiki/Nuclear_weapon_yield

500 kg에 500 kt 정도면 icbm 핵탄두로 충분.

http://www.bbc.com/news/world-asia-41139445

https://en.wikipedia.org/wiki/Nuclear_weapons_testing

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추가

North Korea nuclear test: 'Tunnel collapse' may provide clueshttp://www.bbc.com/news/41139740

Why would the tunnel collapse? It could be that the tunnel was not constructed sufficiently to handle an explosion of that size. It's also possible that they intended for this collapse to occur - a way of signalling to the world that this was an authentic test through radionuclide release, a serious advance. It is still too early to tell.
시뮬레이션이 아니고 진짜 실험이라고?

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추가 2

1) 50-1000 kt
2) 70-140 kt

#### 댓글 2개:

1. 90년대 이후로 최고로 무섭네요.
주말날씨좋은데 마음이 무겁습니다.

1. 이제는 전적으로 미국에 달린 문제같네요.