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CO2 is no longer increasing (?)
Hello, dear readers!
How have you been?
April will come soon, but we still have cold days in Japan.

I was so surprised last Saturday that the growth of the CO2 concentration in the atmosphere got saturated since 2011 and has even been decreasing for two years according to Nikkei newspaper.
That was the first news to me.

The paper said that the phenomenon was due to efforts by some countries in decreasing the exhausted CO2.
But in my opinion CO2 concentration is not affected simply by human activities.

I will try to catch up the truth…

Today’s amusement is If I Fell all by myself with a small echo effected.

Please enjoy!
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| Science | 06:11 | コメント:2
I tried to plot the number of earthquakes for between before and after the big earthquake
Hello, everyone!
How are you?

To the evacuating people at the Kumamoto-Oita Earthquake, I really pray for the earliest recovery of your usual lives.

I understand that earthquake forecasting is very difficult even by the authorities.
But today I tried one analysis from the standpoint of a citizen.

I tried to figure graphs by which any pre sign for the big earthquake might be seen.
So I plotted the number of earthquakes per day for between before and after the Kumamoto-Oita Earthquake.
The data were cited from the database of earthquake at Yahoo Japan about those occured within the Kumamoto-Oita area.
Please see Fig.1.

Kumamoto-Oita Earthquake
Fig.1. Number of earthquakes at Kumamoto-Oita Earthquake (2016)

Nothing particular is seen for five months until April 14th.

Then I plotted samely for the Great East Japan Earthquake on March 11th, 2011.
The data were also from Yahoo Japan about those occurred within the offshore of the East Japan area.
Please see Fig.2.

Great East Japan Earthquake
Fig.2. Number of earthquakes at Great East Japan Earthquake (2011)

I could not see very clear signs before March 11th.
However, the following two points may be remarkable.

1. On March 9th a big earthquake of Magnitude 7.2 occurred, then two days after the huge earthquake of Magnitude 9.0 occurred.
Does this resemble the phenomenon at the Kumamoto Earthquake?
Most people in Kumamoto thought the aftershocks of the earthquake on April 14th should settle soon, however, the bigger quake hit them on April 16th.
The Meteorological Agency commented that the one on April 16th be the main shock.

Similarly, could we think that the earthquake on March 9th, 2011 was a foreshock of the main shock on March 11th?

2. Total number of earthquakes per month was around 10 before, however, in February (ie, the previous month) it was 18.

Of course, we cannot lead any strong conclusion only from the above observations.
But at least we can say that if we encounter a big earthquake, soon after another bigger one might come.
We never forget this possibility.

Such pre signs of an earthquake could probably be differently seen due to its mechanism of earthquake, its size and so on.

Please have your best safeguards against earthquakes.

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| Science | 03:59 | コメント:0
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ST Rocker

Author:ST Rocker
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Located in Tsukuba, Japan

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