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Real-time Earthquake Map courtesy of the U.S. Geological Survey.

Real-time Earthquake Map courtesy of the U.S. Geological Survey.

Using the US Geological Survey to track earthquakes, I found 3 epicentres of close proximity of one another within 7 years. This was in a small area inside North Korea. I would not assume this to be an earthquake of any kind. But rather, something completely artificial. So with the data included below this post, I presumed that this could only be the result of several systematic underground nuclear tests. But I will only focus on the largest and most recent nuclear explosion.

Epicentre 1 (M5.1) /Centre (blue)

Date/Time: 2013/02/12 (03:57:51 UTC+01:00)

Location: 41.308°N 129.076°E (uncertainty: ± 11.2 km)

Depth: 0.0km (uncertainty: ± 1.8 km)

Minimum distance: 370.3 km (3.33°)

Event ID: usc000f5t0

DYFI = VI (11 responses in 8 cities)

under

Data contributed by USGS National Earthquake Information Center

Below shows a fairly standard Distance/Intensity plot where a moderate negative correlation is drawn. But intensity appears to tapers off at around 80km and declines at a slower rate.

Data contributed by USGS National Earthquake Information Center

Data contributed by USGS National Earthquake Information Center

And, the responses (for the DYFI report) vs Time. The first report came approximately half-way between 30min and 60min.

Data contributed by USGS National Earthquake Information Center

Data contributed by USGS National Earthquake Information Center

And just for fun… Theoretical P-Wave travel times map for the world. Here is the table for this data in HTML format. As you can see, it takes little under 12 minutes for the p-wave to reach London from the epicenter.

Location and Magnitude contributed by: USGS National Earthquake Information Center

Location and Magnitude contributed by: USGS National Earthquake Information Center

Here’s a statement from the US to the UN regarding this (and previous tests):

http://usun.state.gov/briefing/statements/204033.htm

Finally, here’s the data for the other epicentres.

Epicentre 2 (M4.7) /Left

Date/Time: 2009/05/25 (01:54:43 UTC+01:00)

Location: 41.303°N 129.037°E (North Korea)

Depth: 0.0km

Epicentre 3 (M4.3) /Right

Date/Time: 2006/10/09 (02:35:28 UTC+01:00)

Location: 41.294°N 129.094°E (North Korea)

Depth: 0.0km

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