Other western states, like Nevada, Idaho, Washington and Oregon are prone to earthquakes or can be damaged by earthquakes that happen in Alaska and California. When the surface of the earth moves in response to heat and pressure from below, the shaking is called an earthquake.
Earthquakes can happen in many places, but there are some areas where they are concentrated. No one can predict earthquakes yet, nor prevent them, but you can protect yourself by preparing for one.
It is important for earthquake-prone countries such as Japan to build houses and buildings that react well to earthquakes.
The epicentre of an earthquake is the area on the surface, above the point where the earthquake originated.
There are about 500,000 earthquakes a year around the world, as detected by sensitive instruments. One way scientists help is by comparing readings from widely spaced seismographic stations to determine the exact position of the earthquake's origin.
More recently, an earthquake that hit the Tohoku region of Japan on March 11, 2011, had a magnitude of 9.0 and killed over 15000 people. The speeds of the seismic waves enable scientists to locate the epicentre of an earthquake. The two largest earthquakes in the lower 48 states in the last 45 years have been in Idaho (1959 and 1983). Earthquakes can sometimes be nothing more than small tremors or shakes, but sometimes they can cause damage and devastation. Each year, the southern California area alone experiences about 10,000 earthquakes, most of them not felt by people. A short wiggly line that doesn’t wiggle very much means a small earthquake, and a long wiggly line that wiggles a lot means a large earthquake. The estimates are that there are about 500,000 detectable earthquakes a year, 100,000 of those can be felt, and about 100 of them cause damage. Liquefaction, ground displacement, flooding, tsunamis, and fire are all hazards of earthquakes. Other quakes can occur far from faults zones when plates are stretched or squeezed.Scientists assign a magnitude rating to earthquakes based on the strength and duration of their seismic waves. Learn more about the Richter Scale here.In addition to the Richter scale, scientists also use the Mercalli Intensity Scale to measure the amount and type of damage caused by the earthquake.

The plate boundaries are made up of many faults, and most of the earthquakes around the world occur on these faults. Finally, when the plate has moved far enough, the edges unstick on one of the faults and there is an earthquake. FREE primary school teaching resources, including FREE to download classroom display resources for Early Years (EYFS), KS1 and KS2 including stickers, posters, wordmats, signs, roleplay ideas and much much more! Take the FREE & fun all about Earthquakes quiz and download FREE all about Earthquakes worksheet for kids. Earthquakes travel in ripples or waves across the earth and through the layers of the earth.
Earthquakes can make buildings fall down and set off landslides, as well as having many other deadly effects.
The hypocentre of an earthquake is the area below the earth’s surface; it is the place where the earthquake began. An earthquake is what happens when two blocks, or ‘plates’ of the Earth suddenly slip past one another. An earthquake that occurs at the bottom of the sea can push water upwards and create massive waves called tsunamis. When he was angry, Poseidon would strike the ground with his trident and set off an earthquake.
Tsunamis are caused by disturbances within the surrounding areas; they are usually caused by underwater earthquakes, volcanic eruptions and landslides.
Rather, because oil generally is found in soft and squishy sediment, when oil is removed other rock moves in to fill the space left behind, creating mini earthquakes that are not noticeable to humans.
Scientists also talk about the intensity of shaking from an earthquake, and this varies depending on where you are during the earthquake. The epicenter of an earthquake is the place on the Earth's surface directly above the focus (more than one are called foci), which is the place inside the Earth where the quake originates. Smaller temblors that usually occur in the days following a large earthquake can complicate rescue efforts and cause further death and destruction.Loss of life can be avoided through emergency planning, education, and the construction of buildings that sway rather than break under the stress of an earthquake. Seismology is the study of earthquakes and a seismologist is the scientist that studies earthquakes.
Almost 80% of all the planet's earthquakes occur along the rim of the Pacific Ocean, called the "Ring of Fire"; a region that encircles the Pacific Ocean and is home to 452 volcanoes (over 75 percent of the world's active and dormant volcanoes).
Unlike earthquakes, which are often followed by aftershocks, the storms that birth tornadoes are independent of one another.

You are unlikely to feel a magnitude 3 earthquake but magnitude 6 earthquakes could potentially cause large damage. The instrument uses a weighted pen and a spring and the vibrations from the earthquake makes the pen draw lines onto some paper. The location below the earth’s surface where the earthquake starts is called the hypocentre, and the location directly above it on the surface of the earth is called the epicentre. As an earthquake is recorded, the pen jumps back and forth on the paper showing the intensity of the earthquake. Geologists and seismologists use two different scales to measure how strong an earthquake is. A Richter Scale is a device that gauges the magnitude (the energy it generates) of the earthquake. If a person were standing in just the right location and could see the surface of the earth during an earthquake, the ground would actually appear to be moving in a wave. Because the P wave is traveling faster, the time between the P and S wave increases away from the earthquake. Humans developed many explanations for earthquakes before they had the understanding and instruments to study them scientifically. This leads to the characteristic shape of an earthquake on a seismogram with a small P wave followed by a larger S wave. A gigantic frog which carried the world on its back, twitched periodically, producing earthquakes. The Richter Scale measures magnitude, the amount of energy released by an earthquake by measuring how big a shock wave is. You can read about some of these ideas about Earthquake Myths and Folklore.Here's a myth from Mongolia, China. A tsunami happens when shocks from the earthquake create huge waves that come inland and strike communities along the ocean coast.

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