what is the difference between the focus and epicentre of an earthquake?
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hypocenter. The hypocenter is the point within the earth where an earthquake rupture starts. The epicenter is the point directly above it at the surface of the Earth. Also commonly termed the focus.
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Aftershocks are earthquakes that usually occur near the mainshock. ... An earthquake will be called an aftershock as long as the rate of earthquakes is higher than it was before the mainshock. For big earthquakes this might go on for decades. Bigger earthquakes have more and larger aftershocks.
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Magnitude and Intensity measure different characteristics of earthquakes. Magnitude measures the energy released at the source of the earthquake. Magnitude is determined from measurements on seismographs. Intensity measures the strength of shaking produced by the earthquake at a certain location.
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Magnitude is a measure of earthquake size and remains unchanged with distance from the earthquake. Intensity, however, describes the degree of shaking caused by an earthquake at a given place and decreases with distance from the earthquake epicentre.
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What is difference between focus and principal focus? Principal focus is a point on the principal axis where the rays which are incident parallel to the principal axis meet after reflection. ... Focus is a point where rays parallel to each other meet.
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What is the difference in magnitude and destruction between a "regular" volcano and a supervolcano? Regular volcanoes eject millions of cubic feet of ash and debris, while super volcanoes eject billions.
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As nouns the difference between fault and earthquake is that fault is a defect; something that detracts from perfection while earthquake is a shaking of the ground, caused by volcanic activity or movement around geologic faults.
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explain were earthquakes are more likely to originate and why they originate in these places. most major earthquakes originate from the strain that builds up along faults. ... the epicenter of an earthquake is the point on earth's surface directly above the focus of an earthquake.
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As nouns the difference between flood and earthquake is that flood is a (usually disastrous) overflow of water from a lake or other body of water due to excessive rainfall or other input of water while earthquake is a shaking of the ground, caused by volcanic activity or movement around geologic faults.
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The main importance in determining the epicentre is so that the fault that ruptured causing the earthquake can be identified. ... If the fault is previously unknown (such as the 2010 Canterbury earthquake), then it is important because it means that the hazard models for the area need improvement.
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seismograph. A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base.
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What is the difference between magnitude and intensity? Magnitude is a measure of earthquake size and remains unchanged with distance from the earthquake. Intensity, however, describes the degree of shaking caused by an earthquake at a given place and decreases with distance from the earthquake epicentre.
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That means a magnitude 7 earthquake produces 32 times more energy — or is 32 times stronger — than a magnitude 6. A magnitude 8 releases 1,000 times more energy than a magnitude 6, but it releases that energy over a larger area and for a longer time, Jones said.
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Quakes can strike near the surface or deep within the Earth. Most quakes occur at shallow depths, according to the U.S. Geological Survey. ... Shallow quakes generally tend to be more damaging than deeper quakes. Seismic waves from deep quakes have to travel farther to the surface, losing energy along the way.
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seismograph. A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not.
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Many large earthquakes are preceded by smaller rumbles known as foreshocks. However, there is apparently no way to distinguish these tremors from other small quakes that don't portend a larger temblor. ... "Seismologists have kind of given up finding such signals in the early nucleation phase before earthquakes."
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Quakes can strike near the surface or deep within the Earth. Most quakes occur at shallow depths, according to the US Geological Survey. ... Shallow quakes generally tend to be more damaging than deeper quakes. Seismic waves from deep quakes have to travel farther to the surface, losing energy along the way.