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Showing posts with label earthquake. Show all posts
Showing posts with label earthquake. Show all posts

June 5, 2012

Simulation of a strong earthquake that would leave 50,000 dead in Lima


Peru on Thursday made ​​a mock earthquake and tsunami of 8 on the Richter scale, one of the three planned in 2012 as part of a campaign to prepare for an earthquake in Lima that could leave more than 50,000 dead, the worst case scenario.

The drill began at 10:00 local (15:00 GMT), estimated time of the earthquake, and sought to measure the responsiveness of the population and authorities to a natural disaster to turn warning systems and evacuation routes in areas where there could be a tidal wave.

The hypothetical epicenter of the earthquake was estimated at 190 kilometers west into the Pacific Ocean, creating a tsunami wave train which would take from 15 to 20 minutes of playing the Peruvian coast.

May 30, 2012

NASA detects changes in the ionosphere after Japan quake



The earthquake and tsunami that struck Japan early last year generated deep atmospheric disturbances, according to a report from NASA.

The energy waves unleashed by the quake and tsunami were so intense that reach the ionosphere, the last section of the atmosphere located between 80 and 805 kilometers.Ionosphere filtered ultraviolet breaking molecules, leaving a halo of scattered electrons and ions. Studies done after the Japanese earthquake show a change in their distribution pattern.

The phenomenon has been observed before as after the tsunami in Samoa in 2009 and the earthquake in Chile in 2010.

May 24, 2012

Scientists predict an earthquake of more than 8 degrees in the failure of the Alps of New Zealand


Scientists predict the next big break could happen at any time, as has been the longest time between breaks in the last thousand years.The researchers recorded from New Zealand deep tremors lasting up to 30 minutes in the Alpine Fault, which runs along the South Island.

The earthquake, which caused no damage to the surface, there were 20-45 kilometers (12-28 miles) below Earth's crust and continued for as long as half an hour, far more than ordinary earthquakes.

Scientists have been intrigued for decades by an apparent absence of earthquakes in the central section of the fault of the Alps, between Fox Glacier and Whataroa Valley 50 km north. The Alpine Fault has ruptured four times in the last 1000 years.

Researchers at Victoria University of Wellington had to place sensors in boreholes 100 meters deep to collect the earthquakes because earthquakes could not be measured by normal seismic monitoring devices.

No set of 11 stations, called the Southern Alps well microseismic array - or SAMBA - were installed in late 2009 and are still producing data. To date, SAMBA has registered about 2,500 small earthquakes that are occurring in a 30 km wide in the area of ​​the Southern Alps, rather than the fault of the Alps.

It is the second time this type of seismic activity was recorded in a strike-slip fault, which are those walls that move sideways rather than up or down. The other is the San Andreas Fault in California.

Research shows that between large earthquakes, the fault is still moving. It is still unclear what this means for future earthquakes - it could be that the constant tremor accumulates stress and can trigger a major fault movement or, alternatively, activity can decrease the probability of a major earthquake, acting as an outlet for stress.

The Alpine Fault has generated four earthquakes of magnitude 8.0 or greater in the last 900 years, most recently, in early 1700, and a delay. There is a high probability of occur in the coming years, producing "one of the largest earthquakes since European colonization of New Zealand (that) will have a major impact on the lives of many people."

The 6.3 magnitude quake that killed 185 people in the south island city of Christchurch, in February last year lasted just 37 seconds and occurred at a depth of about five kilometers.

The Christchurch earthquake was not caused by the failure of the Alps, but a previously unknown fault, part of a seismic fracture network that crosses New Zealand, located at the junction of two tectonic plates. (Victoria University of Wellington)

The research results were published in a magazine Rated American, Geophysical Research Letters, which specializes in short papers on recent and important discoveries.The Alpine Fault runs through the South Island of New Zealand from the latitude of 44 ° S - 42 ° S and longitude of 168 ° E - 173 ° E. Is the transform boundary between the Pacific Plate and the Indo-Australian.

Transform boundaries means that the plates move side by side against each other rather than collide or separate. Earthquakes occur in this ruling, the plates from sliding against each other, and formed the Southern Alps.

The Alpine fault connects two "subduction", where the margins of the sea floor descends into the Earth's mantle. At this point the surfaces of the two plates forming the South Islands Alpine failure to fulfill.

The Pacific plate in the eastern part of New Zealand is moving westward and the Australian plate, on the western side of New Zealand move to the east. Moving at a relative speed of approximately 45 mm per year.

As these two plates move against each other enormous pressure builds up over time to be released through earthworks.

The result is a large earthquake on the fault of the Alps. The pressure has been continuous construction of about 280 years since it opened last by a major earthquake in 1717 AD.
Scientists predict the next big break could happen at any time, as has been the longest time between breaks in the last thousand years.

According to Associate Professor Tim Davies in Cromwell, Wanaka and Queenstown, the next earthquake centered on the failure of the Alps should start in South Westland

Alarm 6.2 magnitude earthquake in the Norwegian Sea


At magnitude 6.2 earthquake recorded in the Norwegian Sea has alarmed tsunami in the Pacific Tsunami Center.

According to the U.S. Geological Survey, the epicenter was located 600 km from the Norwegian city of Tromso and more than 1000 km from Murmansk (Russia). An underground tremor was recorded at a depth of 8.8 km.

Earthquake of 5.6 Richter shakes five regions of Chile


An earthquake of 5.6 magnitude on the Richter scale rocked the Maule, Bio Bio, La Araucania, Los Ríos and Los Lagos, in the central and southern Chile, causing no casualties or significant damage, officials said.

The quake occurred at 15.18 hours (19.18 GMT) and its epicenter was located in the Andes, 72 kilometers southeast of San Fabian and about 500 of Santiago, said the Seismological Institute of the University of Chile.

The hepicentro the quake, which covered about 850 kilometers from the Chilean territory, is situated at a depth of 166.1 kilometers the agency said. According to the National Emergency Office (Onemi) the quake was felt in a quarantine of affected areas, with intensities of grade II to V on the Mercalli scale international, ranging from I to XII.

The quake occurred about four hours after another 5 degrees of magnitude, which affected much of the region of Atacama in northern Chile, which caused no casualties or damage visible.

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