¡Bienvenidos!/Welcome!

Hola, ¿qué tal?

Somos la clase de 3ºB del IES Lauretum (Espartinas).

En este blog vamos a hablar sobre el medio ambiente, teniendo en cuenta que este año es el año de los bosques y de la química. También trataremos temas como el reciclaje, los tipos de energía, la concienciación ecológica...

Esperamos que os guste mucho el blog, que hagáis críticas constructivas, que sugiráis ideas o que se pregunten dudas.

¡Gracias por visitarnos!





Hi, how are you?

We are a group of pupils of the Secondary High School Lauretum, in Espartinas (Seville).

In this blog we will talk about the environment as 2011 is the forests and chemistry's year. Also we will deal other themes, like recycling, energy types, environmental awareness...

We hope you'll like the blog, and we wait for your constructive critics and your new ideas or questions you have.

Thanks for visiting us!





Mostrando entradas con la etiqueta Actualidad en Japón/Currently in Japan. Mostrar todas las entradas
Mostrando entradas con la etiqueta Actualidad en Japón/Currently in Japan. Mostrar todas las entradas

miércoles, 16 de marzo de 2011

Japan Crisis

CATASTROPHE IN JAPAN
Confronted with an earthquake catastrophe on this scale Japan is showing the resilience and
ability to cope that has seen it recover from previous disasters. Everyone looking at the graphic images of destruction wrought by last Friday's tsunami realises how much they will n
eed such a
spirit, along with help to overcome it. Prime minister Naoto Kan says this is the worst disaster to
have hit Japan since the second World War

It far exceeds the impact of the Kobe earthquake in 1995 and is in fact one of the most powerful
ever recorded. The growing crisis over nuclear safety brings that fully home to an anxiously
watching world.

Japanese people are used to earthquakes and well- prepared for them. This can be seen from the
minimal physical damage caused in Tokyo compared to the waste lands and cities along the
northeast coast which was exposed to such a sudden and massive tsunami. Even the current estimate
of 10,000 immediate deaths must be seen as an underestimate when its full power and effects are
assessed. On top of that comes the millions made homeless and lacking food, water and shelter in
the last few days. Worries about further severe aftershocks and potential supplementary tsunamis
compound the picture. The wider impact on transport, power systems and economic life brings out
the challenge for Japanese people to work together and draw on international support as they do so.

Initial estimates that it will cost about $120 billion to rebuild the region are another indication of
this earthquake's scale. That would be an extraordinary boost to Japan's sluggish economy, even
though many already worry how it would affect the country's government debt of 200 per cent of
gross domestic product, one of the highest in the world. Japanese people are now older than the
generations who rebuilt the country after 1945 and then drove its development further in the 1970s
and 1980s to become the second largest economy in the world after the United States. This ranking
has only recently given way to China. That such a highly developed society is open to such a
natural catastrophe is a salutary reminder of its physical vulnerability.

That brutal fact is well illustrated in the radiation crisis now unfolding at three nuclear power plants
north of Tokyo. Their safety systems withstood the earthquake but were overwhelmed by the
tsunami which destroyed back-up cooling equipment. Efforts to find substitute methods for dealing
with the problem are hampered by physical access and damage already incurred. Inevitably there
are questions raised about the safety of these particular plants exposed to such a major adjacent
faultline in the earth's tectonic plates, as well as to the dangers posed by tsunami waves notwithstanding
their 40 safe years of energy production since they were first commissioned.
Experts say this should not to be compared with Chernobyl in 198-6 but rather with the less serious
meltdown accident at the US Three Mile Island plant in 1981. But a worldwide debate on the safety
of nuclear energy is bound to follow, whatever happens this week in Japan.
FLOODING FROM TSUNAMI NEAR SENDAI, JAPAN

NASA’s Terra satellite's first view of northeastern Japan in the wake of a devastating earthquake and tsunami reveal extensive flooding along the coast.
Water is black or dark blue in these images. It is difficult to see the coastline in the March 12 image, but a thin green line outlines the shore. This green line is higher-elevation land that is above water, presumably preventing the flood of water from returning to the sea. The flood indicator on the left image illustrates how far inland the flood extends.



JAPAN QUAKE MAY HAVE SHORTENED EARTH DAYS, MOVED AXIS

The March 11, magnitude 9.0 earthquake in Japan may have shortened the length of each Earth day and shifted its axis. But don't worry—you won't notice the difference.

Using a United States Geological Survey estimate for how the fault responsible for the earthquake slipped, research scientist Richard Gross of NASA's Jet Propulsion Laboratory, Pasadena, Calif., applied a complex model to perform a preliminary theoretical calculation of how the Japan earthquake—the fifth largest since 1900—affected Earth's rotation. His calculations indicate that by changing the distribution of Earth's mass, the Japanese earthquake should have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds (a microsecond is one millionth of a second).

The calculations also show the Japan quake should have shifted the position of Earth's figure axis (the axis about which Earth's mass is balanced) by about 17 centimeters (6.5 inches), towards 133 degrees east longitude. Earth's figure axis should not be confused with its north-south axis; they are offset by about 10 meters (about 33 feet). This shift in Earth's figure axis will cause Earth to wobble a bit differently as it rotates, but it will not cause a shift of Earth's axis in space—only external forces such as the gravitational attraction of the sun, moon and planets can do that.

Both calculations will likely change as data on the quake are further refined.

In comparison, following last year's magnitude 8.8 earthquake in Chile, Gross estimated the Chile quake should have shortened the length of day by about 1.26 microseconds and shifted Earth's figure axis by about 8 centimeters (3 inches). A similar calculation performed after the 2004 magnitude 9.1 Sumatran earthquake revealed it should have shortened the length of day by 6.8 microseconds and shifted Earth's figure axis by about 7 centimeters, or 2.76 inches. How an individual earthquake affects Earth's rotation depends on its size (magnitude), location and the details of how the fault slipped.

Gross said that, in theory, anything that redistributes Earth's mass will change Earth's rotation.

"Earth's rotation changes all the time as a result of not only earthquakes, but also the much larger effects of changes in atmospheric winds and oceanic currents," he said. "Over the course of a year, the length of the day increases and decreases by about a millisecond, or about 550 times larger than the change caused by the Japanese earthquake. The position of Earth's figure axis also changes all the time, by about 1 meter (3.3 feet) over the course of a year, or about six times more than the change that should have been caused by the Japan quake."

Gross said that while we can measure the effects of the atmosphere and ocean on Earth's rotation, the effects of earthquakes, at least up until now, have been too small to measure. The computed change in the length of day caused by earthquakes is much smaller than the accuracy with which scientists can currently measure changes in the length of the day. However, since the position of the figure axis can be measured to an accuracy of about 5 centimeters (2 inches), the estimated 17-centimeter shift in the figure axis from the Japan quake may actually be large enough to observe if scientists can adequately remove the larger effects of the atmosphere and ocean from the Earth rotation measurements. He and other scientists will be investigating this as more data become available.

Gross said the changes in Earth's rotation and figure axis caused by earthquakes should not have any impacts on our daily lives. "These changes in Earth's rotation are perfectly natural and happen all the time," he said. "People shouldn't worry about them."

lunes, 14 de marzo de 2011

Lo que está pasando en Japón. What is happening in Japan.

Un devastador terremoto asoló el viernes el noreste de Japón, provocando  mortales tsunamis a lo largo de amplias zonas de la costa del Pacífico. Se  piensa que podría haber cientos de muertos y numerosos desaparecidos. .


Todo comenzó dos días antes del Gran Terremoto.
Una serie de seismos impidió que los japoneses midiesen la magnitud del Gran Terremoto.

Entre las decenas de seísmos que se produjeron, 23 de ellos fueron de magnitud superior a 5 en la escala de Richter y uno alcanzó 7,2.

Los científicos previeron que el viernes día 11 de marzo, se iba a producir un terremoto, pero no de esa magnitud (de 8,9 en la escala de Ritcher).
Los investigadores elaboran mapas de pronóstico a corto plazo y los ponen a prueba en tiempo real a medida que se producen nuevos terremotos.

El terremoto provocó un gran Tsunami que devastó todos los pueblos y ciudades costeros.

El Tsunami dejó a la central nuclear de Fukushima sin electricidad para que las bombas de refrigeración funcionasen.
Aumentó la temperatura y posteriormente aumentó la presión.
Provocó explosiones en varios reactores y ahora se ha declarado estado de alerta nuclear.

Para más información sobre Fukushima:

http://www.elmundo.es/elmundo/2011/03/13/internacional/1300017425.html
Información geográfica y demás:
http://www.elmundo.es/especiales/2011/terremoto-japon/terremoto_tsunami.html