Scientists are particularly seismic experts in various parts of the world still continue to analyze the magnitude 9 triggered a massive earthquake that shook Japan on Friday (06/06/2011). An earthquake with the strength of it is far above the predictions of experts.
Throughout the history of intensive recording of the earthquake, the quake was the strongest. An earthquake with a nearly equal strength last took place more than 1,000 years ago, the earthquake in 869 years an estimated magnitude 8.4 on the Richter scale.
Initial findings of Volcanology and Geophysics Institute of Italy, or Italy's National Institute of Geophysics and Volcanolog (INGV) shows that the earthquake that occurred in Japan, resulting in the shifting axis of the Earth about 25 centimeters from the previous position.
In fact, the earthquake also caused the Earth's mass distribution changes because of plate movement and the collapse of rock in the Earth's skin. These affect the speed of rotation of the earth to be a little faster and humans have a shorter day.
"By changing the mass distribution in the Earth, Japan earthquake resulted in the Earth rotates more quickly, shortening the day as much as 1.8 microseconds," said Richard Gross, geophysicist at NASA's Jet Propulsion Laboratory in Pasadena
This is what makes the experts still wondered why an earthquake can be big?
Yugi Yaji Professor at the University of Tsukuba opinion, officially named the earthquake quake Tohoku Chiho Taiheiyo-Oki-occur due to the movement in several areas around the seismic energy source (focal point) together. According to him, so that might cause an earthquake forces that can only happen once every 1,000 years.
The quake occurred in a subduction zone or a meeting of plate movement triggered an urgent Pacific Plate North American Plate. Pacific Plate that is not strongly resist the urge eventually collapsed.
"The part that collapsed along the 500 kilometers and 100 kilometers wide fell by as high as 8 meters. Some of the area in Fukushima Prefecture is very tense, to be expected that some regions move together," he said.
Yaji said the quake due to this mechanism is not the first time this has happened. Chile earthquake that occurred in 1960 and the Sumatra earthquake that occurred December 26, 2004 was also caused by similar mechanisms.
The experts themselves have actually predicted a massive earthquake will occur in the region around the zone, but only an estimated magnitude 7.5 to 8 on the Richter scale. However, the quake occurred on Friday were higher with seismic energy 90 times larger than expected. Seismic energy released in an earthquake is 180 times greater than the massive earthquake that destroyed Kobe Hanshim 1995 and create 6,000 new casualties.
Furumura Takashi, a professor at the University of Tokyo, said the quake on Friday could be the maximum earthquake that shook Japan. The quake was probably driven bermagnitude 7.2 earthquake that shook Miyagi August 2005. For close to the epicenter is the center of Miyagi earthquake.
Japanese earthquake experts are also still continue to monitor dampah giant earthquake. Although not expected for the earthquake will come again in the near future, changes in the structure of these plates can activate fragments around it and trigger the next quake. Not only the aftershocks, but also an earthquake in the mainland.
Throughout the history of intensive recording of the earthquake, the quake was the strongest. An earthquake with a nearly equal strength last took place more than 1,000 years ago, the earthquake in 869 years an estimated magnitude 8.4 on the Richter scale.
Initial findings of Volcanology and Geophysics Institute of Italy, or Italy's National Institute of Geophysics and Volcanolog (INGV) shows that the earthquake that occurred in Japan, resulting in the shifting axis of the Earth about 25 centimeters from the previous position.
In fact, the earthquake also caused the Earth's mass distribution changes because of plate movement and the collapse of rock in the Earth's skin. These affect the speed of rotation of the earth to be a little faster and humans have a shorter day.
"By changing the mass distribution in the Earth, Japan earthquake resulted in the Earth rotates more quickly, shortening the day as much as 1.8 microseconds," said Richard Gross, geophysicist at NASA's Jet Propulsion Laboratory in Pasadena
This is what makes the experts still wondered why an earthquake can be big?
Yugi Yaji Professor at the University of Tsukuba opinion, officially named the earthquake quake Tohoku Chiho Taiheiyo-Oki-occur due to the movement in several areas around the seismic energy source (focal point) together. According to him, so that might cause an earthquake forces that can only happen once every 1,000 years.
The quake occurred in a subduction zone or a meeting of plate movement triggered an urgent Pacific Plate North American Plate. Pacific Plate that is not strongly resist the urge eventually collapsed.
"The part that collapsed along the 500 kilometers and 100 kilometers wide fell by as high as 8 meters. Some of the area in Fukushima Prefecture is very tense, to be expected that some regions move together," he said.
Yaji said the quake due to this mechanism is not the first time this has happened. Chile earthquake that occurred in 1960 and the Sumatra earthquake that occurred December 26, 2004 was also caused by similar mechanisms.
The experts themselves have actually predicted a massive earthquake will occur in the region around the zone, but only an estimated magnitude 7.5 to 8 on the Richter scale. However, the quake occurred on Friday were higher with seismic energy 90 times larger than expected. Seismic energy released in an earthquake is 180 times greater than the massive earthquake that destroyed Kobe Hanshim 1995 and create 6,000 new casualties.
Furumura Takashi, a professor at the University of Tokyo, said the quake on Friday could be the maximum earthquake that shook Japan. The quake was probably driven bermagnitude 7.2 earthquake that shook Miyagi August 2005. For close to the epicenter is the center of Miyagi earthquake.
Japanese earthquake experts are also still continue to monitor dampah giant earthquake. Although not expected for the earthquake will come again in the near future, changes in the structure of these plates can activate fragments around it and trigger the next quake. Not only the aftershocks, but also an earthquake in the mainland.
No comments:
Post a Comment