Re: Mittlere Erdbeben seit 2003 erheblich häufiger
Geschrieben von Livnyak am 12. April 2005 15:06:54:
Als Antwort auf: Mittlere Erdbeben seit 2003 erheblich häufiger geschrieben von IT Oma am 11. April 2005 22:45:15:
hallo ITOma,
habe mir die seiten mal etwas genauer angesehen und zur frage nach dem vermeintlichen zunehmen der erdbeben den folgenden text ebendort gefunden (leider englisch):
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Are Earthquakes Really on the Increase?
We continue to be asked by many people throughout the world if earthquakes are on the increase. 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 that 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.
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der nachfolgende vergleich der letzten 30 (dreissig) jahre ist ebenfalls unter beruecksichtigung des obigen textes zu betrachten, d.h. je weiter wir uns in richtung gegenwart bewegen, desto mehr DATEN liegen vor
livnyak