At least for the last 12 years in 2011 — the only one that leads in the number of major earthquakes recorded.
The Irish Meteorological Service (weather service online — annotated. Translator) Using data from the U.S. National Geological Survey, conducted a study that the earthquake with a magnitude of 5.0-9.9 from 1 January to 19 June 2011 have already exceeded the total number of seismic events of 2001, 2002 and 2003 combined. Over the past 12 years, the total number of recorded earthquakes in 2011, is also expected to exceed the total number of seismic events that occurred in 2007.
In total, up to 19 June 1445 there were earthquakes of magnitude 5.0 to 9.9. The total number of earthquakes for the whole of 2007 is 2270.
Major earthquakes in Japan (2011), Chile (2010), Sumatra (2005 and 2008.) And Indonesia (2004) reminded us of the devastating impact on the lives and property. While the number of earthquakes with a magnitude between 8.0 and 9.9 is not significantly increased in recent years, however, the number of earthquakes with a magnitude between 5.0 and 7.9 increases. Especially in the last 12 years has increased dramatically moderate earthquakes of magnitude 5.0-6.9.
The above earthquake of moderate to strong on the Richter scale and is much smaller than with a magnitude of more than 7.0, still can cause serious damage and lead to loss of life. Some examples are well known, such as Haiti in 2010 (magnitude 7.0), San Francisco, pieces. California, USA in 1989 (6.9), Caracas, Venezuela, in 1965 (6.5); Krastcherch, N. Zealand in 2011 (6.3), La Aquila, Italy in 2009 (5.8) and Newcastle Australia in 1989 (5.6).
Only in the last 24 hours there was an earthquake of magnitude 5.0 or more in Tonga, Fiji, Panama and South Sandwich Islands, Japan, Papua New Guinea, Peru, Philippines and Indonesia.
Seismologists say that the increase in detected earthquakes does not mean a real increase in earthquakes. For example, the U.S. National geological. Service believes that the increase in the number of earthquakes in recent years must improved global communication and, at the same time, improvements in technology in the detection of seismic events.
According to the USGS: «It may seem that earthquakes were more, but an earthquake of magnitude 7.0 or greater have remained at a constant level during this century, and according to our records, in fact, appeared to have decreased in recent years."
Commenting on the series of earthly activity (there because of minor earthquakes — annotated. Translator) In certain geographic areas, USGS says: "A temporary increase in earthquakes does not mean that can happen earthquake. Similarly, the reduction or absence of seismic activity does not mean that an earthquake. Temporary increase or decrease in seismicity is completely natural. There is no way to accurately predict whether this will lead to a major earthquake or not. A series of small earthquakes, especially in geothermal areas, are common, and a moderately strong earthquake in its magnitude generally cause successive afteshoki. All of this is normal and expected in the "life" of earthquakes. "
Translation: Anna Krasnov