The sharp increase in the number of recorded earthquakes

Seismic chart showing the earthquake in Japan in 2011

At least for the last 12 years in 2011 — the only one that leads in the number of large earthquakes recorded.

The Irish Meteorological Service (weather service online — annotated. Interpreter) Using data from the U.S. National Geological Survey, conducted a study which showed that an 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 in 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 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 earthquake of magnitude 5.0-6.9.

See also: Statistics earthquakes 1990-2010

The above earthquakes of moderate to strong on the Richter scale and much smaller than a magnitude greater than 7.0, still can cause serious damage and lead to loss of lives. Some examples are well known, for example, in 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 have been earthquakes of magnitude 5.0 or more in Tonga, Fiji, Panama, South Sandwich Islands, Japan, Papua New Guinea, Peru 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 required an improved global communications and, at the same time, improvements in technology in the detection of seismic events.

see also: The number of victims of earthquakes

According to the USGS: «It may seem that the earthquake was bigger, but earthquakes of magnitude 7.0 or greater have remained somewhat constant throughout this century and, according to our records, actually appeared to have decreased in recent years."

Commenting on the series of earthly activity (there because of small earthquakes — annotated. Interpreter) In certain geographic areas, USGS says: "A temporary increase in earthquakes does not mean that an earthquake could happen. Similarly a reduction or absence of seismic activity does not mean that an earthquake. A temporary increase or decrease in the seismicity is quite 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 in its magnitude earthquake usually cause successive afteshoki. All of this is normal and expected in the "life" of earthquakes. "

Charts earthquakes from 2001 to 2011.,
compiled by the Irish weather online service

Translation: Anna Krasnov
Source: Irish Weather Online

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