Energy & Green Tech

Robot issue delays fuel removal from Fukushima nuclear plant

The operator of the wrecked Fukushima nuclear power plant said Thursday it is further postponing the start of the removal of highly radioactive melted fuel from its damaged reactors because of delays in the development of ...

Energy & Green Tech

Japan court: Nuclear plant's tsunami safeguards inadequate

A Japanese court on Tuesday ordered a utility not to restart a nuclear power plant because of inadequate tsunami safeguards, backing the safety concerns of residents at a time the government is pushing for more reactors to ...

Energy & Green Tech

Japan OKs plan to release Fukushima nuclear plant wastewater

Japan's nuclear regulator on Wednesday approved plans by the operator of the wrecked Fukushima nuclear plant to release its treated radioactive wastewater into the sea next year, saying the outlined methods are safe and risks ...

Energy & Green Tech

Japan issues power warning after quake hits supply

Japan's government warned on Tuesday of possible widespread electricity outages for Tokyo and its surrounding regions as power plants hit by last week's powerful earthquake struggled to meet surging demand caused by a cold ...

Energy & Green Tech

Robot photos appear to show melted fuel at Fukushima reactor

A remote-controlled robot has captured images of what appears to be mounds of nuclear fuel that melted and fell to the bottom of the most damaged reactor at Japan's wrecked Fukushima nuclear plant, officials said Thursday.

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An earthquake (also known as a tremor or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. The moment magnitude of an earthquake is conventionally reported, or the related and mostly obsolete Richter magnitude, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale.

At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacing the ground. When a large earthquake epicenter is located offshore, the seabed sometimes suffers sufficient displacement to cause a tsunami. The shaking in earthquakes can also trigger landslides and occasionally volcanic activity.

In its most generic sense, the word earthquake is used to describe any seismic event — whether a natural phenomenon or an event caused by humans — that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults, but also by volcanic activity, landslides, mine blasts, and nuclear experiments. An earthquake's point of initial rupture is called its focus or hypocenter. The term epicenter refers to the point at ground level directly above the hypocenter.

This text uses material from Wikipedia, licensed under CC BY-SA