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Commentaire de joletaxi

sur Le plein d'énergies propres


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joletaxi 27 février 2012 18:52

vous en voulez une autre ?

ces dernières années nous avons eu droit à une série de séismes dévastateurs(je ne parle pas de Fuku, car tout le monde sait aujourdhui que cette catastrophe n’a rien à voir avec un séisme ou un tsunami) qui ont pu faire croire que dame gaia était en colère

une étude récente montre qu’il n’en est rien

Although it may seem that we are having more earthquakes, earthquakes of magnitude 7.0 or greater have remained fairly constant.

A partial explanation may lie in the fact that in the last twenty years, we have definitely had an increase in the number of earthquakes we have been able to locate each year. This is because of the tremendous increase in the number of seismograph stations in the world and the many improvements in global communications. In 1931, there were about 350 stations operating in the world ; today, there are more than 8,000 stations and the data now comes in rapidly from these stations by electronic mail, internet and satellite. This increase in the number of stations and the more timely receipt of data has allowed us and other seismological centers to locate earthquakes more rapidly and to locate many small earthquakes which were undetected in earlier years. The NEIC now locates about 20,000 earthquakes each year or approximately 50 per day. Also, because of the improvements in communications and the increased interest in the environment and natural disasters, the public now learns about more earthquakes.

donc rien de spécial à signaler, sinon les gesticulations des habitués du club

une bonne nouvelle donc


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