the lower the faults, the relative decrease

American scientists say every time the Japanese earthquake reduced 1.6 microseconds

Source: "2011-03-12 southeast news network

Xinhua net Washington March 11 (xinhua) NASA scientists said on the 11, about to choose the magnitude of 8.8 magnitude earthquake in which Japan on the rotation of the earth time shortened 1.6 microseconds, namely of every day of time reduced 1.6 microseconds. A microsecond equals 100 PPM seconds.

NASA earth physicist Richard ・ grosse says, Japan earthquake cause the quality change, then affects the earth rotation.

American and Italian physicist says some of the earth, those 2004 sumatran earthquake that triggered the Indonesian floor every reduced offset makes 6.8 microseconds, 2010 Chile earthquake made of every day of time reduced 1.26 microseconds.

Northeastern Japan the Pacific Ocean 11 afternoon, the earthquake triggered massive tsunamis and caused heavy loss. The earthquake is since 1900 fifth strong global magnitude earthquake.

Japan meteorological agency official said yesterday, that afternoon happen northeastern Japan great kanto earthquake of magnitude - 8.8 magnitude earthquake records, Japan is the history of the highest magnitude in plate junction, for once the thrust fault type earthquake happened. The China earthquake networks center 鋐 chief forecasters SunShi seal earthquake last night when accepting a reporter to interview, said the Japanese earthquake damage equal to more than 20 wenchuan earthquake.

 

Earthquake cause

 

Plate junction happen to thrust faults

 

Yesterday, the Japan meteorological agency official said the earthquake happened in Japan with 9, the northeast magnitude 7.3 earthquake belong to the same earthquake mechanism. Therefore, 9 earthquake could be precursors sex earthquakes, and this earthquake is the main shock.

 

"Faults possible from the northeast China coastal extends to great kanto region coastal, hundreds of kilometers," seismic tsunami agency monitoring coco long hengshan bowen pointed out in a press conference.

 

He says, just above the Richter magnitude 7 after the earthquake occurred and then on the back of the case unprecedented huge earthquake, the earthquake belong to "special case".

 

Just then the earthquake ibaraki prefecture waters, hengshan bowen said: "this may belong to aftershocks, but there are also may be occur alone."

 

Hengshan bowen said the second wave, tsunami, and the third wave may become higher, the first wave of tsunami did not arrive at the place also may be suffering from some huge tsunami attack, hope citizens to 30 meters high temporarily escape.

 

Energy estimate

 

1 8 earthquake = 30 seven earthquake

 

Happened yesterday 8.8 magnitude earthquake in Japan since became a seismic records after it one of the largest earthquakes.

 

The China earthquake networks center 鋐 chief forecasters SunShi earthquake last night when accepting a reporter to interview said that the Japanese 8.8 magnitude earthquake happened last year, and 8.8 magnitude earthquake in Chile is the same release energy.

 

For 8.8 magnitude earthquake, how damaging SunShi 鋐 says the earthquake energy in earth's internal decay quickly, how to estimate the energy, now still cannot do it. But generally speaking, static calculation, an 8 earthquake equivalent to 30 seven earthquake, a seven earthquake equivalent to 30 6 earthquake, that is, an 8 earthquake equivalent to 900 6 earthquake.

 

When the United States in Hiroshima, an atom bomb the force of the explosion, equivalent to a 5.6 magnitude earthquake. Data shows, when Hiroshima for 34 million people, population explosion center near death, most of the projects on more than 88,000 people, injured and missing for more than 51,000 people, the city's 7.6 million building was destroyed all the 4.8 million blocks, have seriously damaged by 2.2 million arena.

 

SunShi 鋐 said, Japanese earthquake damage, equivalent to more than 20 wenchuan earthquake.

 

【 term explanation 】

 

The seismic tectonic thrust faults is a kind of faults, rising to the dish, the lower the faults, the relative decrease mainly by the horizontal compressive and form. As for fault, it is underground rock stress reaches a certain strength and fracture, and obviously along the fracture surface of the relative movement, this is the main reason for the trigger earthquake.

 

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