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What is an earthquake and what causes them to happen?
https://www.usgs.gov/faqs/what-earthquake-and-what-causes-them-happen
WebAn earthquake is caused by a sudden slip on a fault. The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel. focus
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The Science of Earthquakes | U.S. Geological Survey - USGS.gov
https://www.usgs.gov/programs/earthquake-hazards/science-earthquakes
WebAn earthquake is what happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or fault plane . The location below the earth’s surface where the earthquake starts is called the hypocenter , and the location directly above it on the surface of the earth is called the epicenter . focus
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Earthquake | Definition, Causes, Effects, & Facts | Britannica
https://www.britannica.com/science/earthquake-geology
Web5 days ago · Earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. Learn more about the causes and effects of earthquakes in this article.
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13.2: The Epicenter, Focus, and Waves - Geosciences LibreTexts
https://geo.libretexts.org/Learning_Objects/Laboratory/Book%3A_Laboratory_Manual_For_Introductory_Geology_(Deline_Harris_and_Tefend)/13%3A_Earthquakes/13.02%3A_The_Epicenter%2C_Focus%2C_and_Waves
WebSep 11, 2019 · Earthquakes originate at a point called the focus (plural foci). From this point, energy travels outward in different types of waves. The place on the Earth’s surface directly above the focus is called the epicenter (Figure 13.2).
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Anatomy of an Earthquake | Exploring Earthquakes
https://www.calacademy.org/explore-science/anatomy-of-an-earthquake
WebThe focus is the place inside Earth’s crust where an earthquake originates. The point on the Earth’s surface directly above the focus is the epicenter. When energy is released at the focus, seismic waves travel outward from that point in all directions.
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Forces of Nature - National Geographic Society
https://www.nationalgeographic.org/forces-nature/earthquakes.html
WebWhat is an earthquake? An earthquake is a sudden shaking of Earth's surface caused by the movement of rocks deep underneath. Most quakes are unnoticeable by people on Earth's surface. Thousands of quakes occur every day but are too weak to be felt. Video courtesy of Security Camera / Anadolu Agency via Getty Images.
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Epicenter and Focus (hypocenter) of an Earthquake - IRIS …
https://www.iris.edu/hq/inclass/video/epicenter_and_focus_hypocenter_of_an_earthquake
WebKeypoints: Epicenter is the location on the surface of the Earth directly above where the earthquake starts. Focus (aka Hypocenter) is the location in the Earth where the earthquake starts. We encourage the reuse and dissemination of the material on this site as long as attribution is retained.
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Epicentre | Earthquake, Wave Propagation & Seismic Activity
https://www.britannica.com/science/epicentre
WebEpicentre, point on the surface of the Earth that is directly above the underground point (called the focus) where fault rupture commences, producing an earthquake. The effects of the earthquake may not be most severe in the vicinity of the epicentre. The epicentre can be located by computing arcs.
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Earthquakes - British Geological Survey
https://www.bgs.ac.uk/discovering-geology/earth-hazards/earthquakes/
WebThe shock waves radiate out from the point where the rocks first begin to break; this point is called the focus or hypocentre of the earthquake. The energy is dissipated as the shaking we call an earthquake. BGS ©UKRI. Movements within the Earth’s crust cause stress to build up at points of weakness, and rocks to deform.
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5.4: Earthquakes - Geosciences LibreTexts
https://geo.libretexts.org/Courses/Lumen_Learning/Book%3A_Earth_Science_(Lumen)/05%3A_Earths_Interior_Processes/5.04%3A_Earthquakes
Web5.4: Earthquakes. Page ID. Table of contents. Causes and Types of Tectonic Stress. Geologic Structures: Joints and Faults. Causes of Earthquakes. Earthquake Zones. Seismic Waves. Annual Earthquakes. Earthquake Prediction.
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