Biggest earthquakes

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Jack Moore

Formation

Big and Significant Earthquakes Convergent Boundaries Divergent Boundaries

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Earthquakes, (also known as quakes or a tremors) are violent movements of the rocks in the Earth's crust. Earthquakes are usually quite brief, but may repeat over a period of time. They are the result of a sudden release of energy in the Earth's crust. This creates seismic waves, which are waves of energy that travel through the Earth. The study of earthquakes is called seismology. Seismology studies the frequency, type and size of earthquakes over a period of time. There are large earthquakes and small earthquakes. Large earthquakes can take down buildings and cause death and injury. Earthquakes are measured using observations from seismometers. The magnitude of an earthquake, and the intensity of shaking, is usually reported on the Richter scale. On the scale, 3 or less is scarcely noticeable, and magnitude 7 (or more) causes damage over a wide area. An earthquake under the ocean can cause a tsunami. This can cause just as much death and destruction as the earthquake itself. Landslides can happen, too. This is an important part of the Earth's rock cycle.

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An earthquake also known as a quake, tremor or temblor is the perceptible shaking of the surface of the Earth, which can be violent enough to destroy major buildings and kill thousands of people. The severity of the shaking can range from barely felt to violent enough to toss people around. Earthquakes have destroyed whole cities. They result from the sudden release of energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.

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RUNNING HEAD: Rough Draft-Peer review Page 1 PEER REVIEW Page 7 ROUGH DRAFT A few minutes of intense shaking, followed by a devastating tsunami, producing widespread destruction. FEMA's best-case scenario, 13,000 people will lose their lives, (Schultz, 2015). The question is not if it's going to happen, it's when. The countdown to catastrophe is on for the Pacific Northwest. We're talking about the Cascadia Subduction Zone. Throughout this paper, I will discuss the who, what, where, when, and how this overdue megaquake will strike. The Cascadia subduction zone is a 620-mile-long crack in the earth's crust. It is in the pacific northwest where the North American tectonic plate meets the Juan de Fuca plate, (Tarbuck, Lutgens, Tasa, 2017). Tectonic plates are pieces of crust that move across the earth's surface over millions of years, (Oskin, 2015). The subduction zone is where two tectonic plates meet. One eventually bends underneath the other, which is what we see in the North Pacific. The Juan de Fuca plate is sliding under the weaker, North American plate. Eventually, the North American plate will buckle, result in a devastating earthquake, followed by massive Tsunami. Subduction zones are found all along the edge of the Pacific in what is called, "The ring of fire." Off the coasts of Washington, Canada, Alaska, Russia, and Indonesia birthed the most devastating earthquakes, tsunamis and volcanic eruptions in history, (Oskin, 2015). The bigger the subduction zone, the higher magnitude of the earthquake. A subduction zone earthquake with a magnitude of 7.5 or greater will likely produce a tsunami. The Cascadia subduction zone is a big one. It runs 620 miles long and 62 miles wide. It has all the ingredients necessary to produce massive devastation. So how do we know that the Pacific Northwest is in danger? Tsunamis are a direct result of an earthquake, volcanic eruption or a massive landslide. The once dubbed, "Orphan Tsunami," hit the eastern coast of Japan on January 27th, 1700, (Atwater et al., 2015). The year 1700 in the Pacific Northwest was considered prehistory, meaning there were no written records of events. Japan, on the other hand, have produced numerous ancient writings of stories that told of flooded fields, wrecked houses, fire, a shipwreck, and evacuations. The Japanese knew that tsunamis were a result of an earthquake, and because they didn't feel any shaking prior, they called the event a high tide. At the time, it wasn't known that tsunamis could occur from earthquakes that happened from faraway lands. Outsiders of Northwestern North America scarcely knew of its existence. At that time, leading European geographers left that part of the map blank. So, for this mystery, the Japanese didn't even know the Pacific Northwest existed, much less that it had produced the earthquake that generated the tsunami, (Atwater et al., 2015). The Chilean earthquake that struck on May 22, 1960, generated a tsunami that surged a ...

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