Last year was 8.8 magnitude earthquake

Undersea earthquake is not always cause tsunamis

 

Tohoku region yesterday afternoon following the earthquake,about to choose Indonesian meteorological department immediately tsunami warning, China national maritime forecasting Taiwan has also said the earthquake may be in the epicenter of hundreds of kilometers around within regional tsunami triggered.

 

Tsunami is a strong destructive waves, sometimes waves as high as dozens of meters. This kind of "water wall" movement speed fast, destructive huge. 1960 Chile tsunami formation waves hit the entire Pacific Ocean.

 

Tsunami usually consists of storm surge, volcanic eruption, underwater since collapse triggered landslides and undersea earthquake, etc. Historical records show that super-large tsunami were largely underwater caused by the earthquake.

 

The seismic tsunami generated by undersea earthquake source will source area faults, water conditions, magnitudes, focal depth etc condition the influence.

 

Undersea earthquake is not always would cause big tsunami. China seismological bureau statistics, in the 1.5 million times in undersea structural earthquake, only about 100 times, causing a tsunami.this Some experts argue that cause tsunamis earthquake magnitude 6.5 on the Richter scale above level in commonly, focal depth in 25 km within.

 

science

 

How to determine a magnitude

 

Magnitude earthquake size level is said. According to how many, releasing energy, magnitude earthquake into different magnitude, the higher the release of energy, the more destructive power.

 

The phrase "Richter magnitude scale" standard distinguishes magnitude earthquake. "The Richter scale" at first by seismologist Charles Richter 1935 in California institute of technology is announced.

 

Global happen every day earthquake, took place about 500 million times a year, with about five million times can be perception, the earthquake damage every year about 1,000 times and magnitude 7 quake occurred more than 10 times a year on average.

 

The earthquake measuring 2.5 level below, people usually be aware of not easily, called small earthquakes or seismic; Leeb 2.5 level to the magnitude of 4.0 grade, near the epicenter of the earthquake will have different degrees of feeling, says inductive earthquake; 5 class above, 6 class the following earthquake known as the medium-strong earthquakes'; More than six level of strong earthquake, called damage buildings; A magnitude 7 earthquake known as the earthquake, more destructive power, huge damaged area usually can reach the epicenter peripheral hundreds of kilometers. (xinhua)

 

interpretation

 

Japanese earthquake has nothing to do with yingjiang earthquake

 

The Chinese earthquake network center forecast of the director, said liu jie lulls in earth's activities

 

The Chinese earthquake network center forecast department director liu jie said yesterday, Japan 8.8 magnitude earthquake has nothing to do with yingjiang and earthquake upcoming "super moon" would trigger earthquake to respond, he thinks, the moon near earth will cause the tides change, this kind of earthquake has certain external cause triggered effect, but not conclusive.

 

Two earthquakes movement involved. Different plates

 

For all concerned, Japan 8.8 magnitude earthquake happened with eve yingjiang whether related to 5.8 earthquake, said two earthquakes jie not linked.

 

According to his introduction, the Japanese 8.8 magnitude quake was the Eurasian plate and the Pacific plate motion, and caused by the earthquake is the Eurasian plate yingjiang triggered with the Indian plate activity.

 

For yingjiang 5.8 earthquake situation, the China earthquake networks center mainly responsible for the researchers say, now looks than normal aftershock appear to be 5.8 earthquake, local earthquake activity is still relatively active. But according to the current situation, short-term inside happen judge above cet 6 earthquake is unlikely.

 

"Super moon" trigger earthquake?

 

According to earlier this month, overseas media reported on 19 is the moon from earth since 1992, on a recent day, and December 2004 tsunami occurred in Indonesia, and led to hundreds of thousands of residents died two weeks later appeared carrying the moon. Then the moon will be out network immediately to the earth bring earthquake, volcanic eruption that such extreme weather.

 

Liu jie in ventilation meeting, he said explanation, March 19 this "the time point is carrying" do exist. He explained that the moon by close to the earth gravity will cause the earth's tidal variations. "But it is just an external force".

 

Liu jie explained, "super moon" will cause the external force as the earthquake is presented.

 

Is not only infer that may also earthquake, "this is not a big earthquake prediction. Can only say this external can trigger earthquake."

 

Earth's activities in active period

 

Since last year, global earthquake disaster constantly, everybody always doubt the earth is being transported into "vibration". To this, the China earthquake networks center experts are also the explanation is given, from the current master observation data shows nearly one hundred years, the earth is in active, but due to a lack of more long-term observation data, for longer time period from so hard to judge.

 

According to introducing, according to nearly 100 years of observation records, earth activity is active period and a quiet periods of differentiation. 1905 to 1923, 1950 to 1965 respectively are frequent two earthquakes stage. Earthquake networks think, from 2004, Indonesian tsunami into a third times earth's frequent earthquakes occurrence period.

 

"Last year was 8.8 magnitude earthquake in Chile, and this year is Japan's 8.8 magnitude from 2004, we think the began to enter into the frequent period."

 

The Chinese earthquake network center forecast department director liu jie added, before two earthquakes are frequent stage basic sustained more than ten years, the earth activity is still active now.