Earthquakes and Tsunamis in Japan
When the blocks of earth slip past each other on a fault line on land it is called an earthquake. When the blocks of earth skip past one another on a fault line in the ocean it is still considered an earthquake, but this type of earthquake can cause a Tsunami. In March of 2011 a giant earthquake hit Japan and then created a Tsunami that killed thousands of people and cause billions of dollars in property damage.
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A new study has revealed the past position of the Australian, Antarctic and Indian tectonic plates, demonstrating how they formed the supercontinent Gondwana 165 million years ago.
A new study shows that large-scale upwelling within Earth’s mantle mostly occurs in only two places: Beneath Africa and the Central Pacific. These upwelling locations have remained remarkably stable over geologic time, despite dramatic reconfigurations of tectonic plate motions and continental locations on the Earth’s surface. The study describes a plate tectonic “quadrupole,” which defines two points of “net convergence” and two points of “net divergence” of tectonic plate motions.
Earthquake researchers have now identified a 30 kilometers long and ten kilometers deep area along the North Anatolian fault zone just south of Istanbul that could be the starting point for a strong earthquake. The group of seismologists say that this potential earthquake source is only 15 to 20 kilometers from the historic city center of Istanbul.
A new subduction zone forming off the coast of Portugal heralds the beginning of a cycle that will see the Atlantic Ocean close as continental Europe moves closer to America.
A new study presents our first glimpse back in geologic time of the recurrence interval of large and megathrust earthquakes impacting the vulnerable BC outer coastline.
Scientists have identified key acoustic characteristics of the 2011 Japan earthquake that indicated it would cause a large tsunami. The technique could be applied worldwide to create an early warning system for massive tsunamis.
Colombia sits atop a complex geological area where three tectonic plates are interacting, producing seismicity patterns that have puzzled seismologists for years. Now seismologists have identified the “Caldas tear,” which is a break in a slab that separates two subducting plates and accounts for curious features, including a “nest” of seismic activity beneath east-central Colombia and high grade mineral deposits on the surface.
New Zealand’s geologic hazards agency reported this week an ongoing, “silent” earthquake that began in January is still going strong. Though it is releasing the energy equivalent of a 7.0 earthquake, New Zealanders can’t feel it because its energy is being released over a long period of time, therefore slow, rather than a few short seconds.
Earthquakes that last minutes rather than seconds are a relatively recent discovery, according to an international team of seismologists. Researchers have been aware of these slow earthquakes, only for the past five to 10 years because of new tools and new observations, but these tools may explain the triggering of some normal earthquakes and could help in earthquake prediction.