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| what causes an earthquake? |
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Definition
| earthquakes are caused by vibrations of earths produced by the sudden release of energy |
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Term
| describe the location of an epicenter and focus. |
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Definition
| epicenter is the location on the surface of earth directly above the focus.focus the the point within the earth where the earthquake starts. |
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Term
| what is the elastic rebound hypothesis? how does it relate to earthquakes? |
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Definition
| elastic rebound hypothesis is the release of built-up energy. most earthquakes are porduced by the release of elastic energy stored in rocks that has been subjected to great forves. |
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| describe aftershock and foreshock. |
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Definition
| aftershock are small quakes that come after a major earthquake. foreshock are small quakes that come before a major earthquake. |
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| how are earthquakes measured? |
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Definition
| historically, scientist have used two different type of measurement to describe the size of an earthquake-intensity and imgnitude |
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Term
| describe the location of an epicenter and focus. |
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Definition
| epicent is the location on the surface of earth directly above the focus. focus is the point within the earth where the earthquake starts |
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Term
| what is the elastic rebound hypothesis?how does it relate to earthquakes? |
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Definition
| elastic rebound hypothesis is the release of built-up energy. most earthquakes are produced by release of elastic energy stored in rocks that has been subjected to great forces. |
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Term
| describe aftershocks and foreshocks. |
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Definition
| aftershock are small quake that come after a major earthquake. foreshocks are small quakes that come before a major earthquake |
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Term
| how are earthquakes measured? |
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Definition
| historically, scientist have used two different types of measurements to describe the size of an earthquake-intensity and magnitude |
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Term
| describe the following earth waves: surface, S waves, and P waves |
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Definition
| surface waves=seismic waves that travel along earth's outer layers. they move up, down and side to side. |
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Term
| how do scientist locate earthquakes? (distance direction) |
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Definition
| the difference in velocities oh P waves provides a way to locate the epicenter. scientist use a travel-time graph, in which one needs at lease 3 seismograph station data |
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Term
| where do most earthquakes occur? |
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Definition
| most of these earthquakes occur around the outer edge of the pacific ocean. this zone is known as the circum-pacific belt. active earthquake area in this zoned include japan, the phillipines, chile, and alaska's aelutian island |
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| describe each of the different scales used to measure earthquaje. which one measures intensity and which one measures magnitude?what is the difference between magnitude and intensity? |
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Definition
| richter scale=measure the magnitude of an earthquake. based on the amplitude of the largest seismic wave. a ten fold system. news reporter use this scale, but scientist no longer use this scale |
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| stable soil turns into a liquid that is not able to support building or other structure. |
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Term
| what causes tsunami? what warning system is used? |
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Definition
| a tsunami is called a seismic sea weave. a tsunami is triggered by an earthquake. it occur where a slab of ocean is displaced vertically along a fault. a tsunami also can occur when the vibration of a quake sets an underwater landslide into motion. |
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Term
| what are some other dangers that occurs due to earthquakes. |
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Definition
| landslide and ground subsidence or the sinking of the ground triggered by the vibration occurs. |
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Term
| describe the layers of earth: |
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Definition
crust
Mantle
outer core
inner core |
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Term
| describe continental drift. |
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Definition
| the contionental drift hypothesis stated that the continents had once been joined to form a single super continent |
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