The seismometer provides data as a seismogram , which is a recording of the magnitude of ground motion over time while regularly measuring the offset between the position of the mass and the frame to which it is attached, in relation to an equilibrium position i.e. when the device is at rest in the absence of any ...
What does a seismograph record?
Seismographs are instruments used to record the motion of the ground during an earthquake . ... As the seismograph shakes under the mass, the recording device on the mass records the relative motion between itself and the rest of the instrument, thus recording the ground motion.
What is a record produced by a seismograph?
The instrument used to record and measure these vibrations is called a seismograph. ... The visual record produced by a seismograph is called a seismogram .
What is the atomic bomb equivalent to a 7.0 earthquake?
| Approximate Richter Magnitude number Seismic energy equivalent: Amount of TNT | 7.0 32 megatons | 7.1 50 megatons | 7.5 178 megatons | 7.8 600 megatons |
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What country has had the most earthquakes?
For which country do we locate the most earthquakes? Japan . The whole country is in a very active seismic area, and they have the densest seismic network in the world, so they are able to record many earthquakes.
What are P and S waves?
In P or compressional waves, the vibration of the rock is in the direction of propagation. P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation .
What do P and S waves tell us?
Seismic waves tell us that the Earth’s interior consists of a series of concentric shells, with a thin outer crust, a mantle, a liquid outer core, and a solid inner core. P waves, meaning primary waves, travel fastest and thus arrive first at seismic stations. The S, or secondary, waves arrive after the P waves.
Is an instrument used for measuring earthquake?
Seismographs are instruments used to record the motion of the ground during an earthquake.
What is the difference between a 7.0 and 8.0 earthquake?
The size of an earthquake increases by a factor of 10 as magnitude increases by one whole number. A magnitude 6.0 earthquake, then, is 10 times larger than a 5.0; a magnitude 7.0 is 100 times larger, and a magnitude 8.0 is 1,000 times larger than a 5.0 .
Which two states have the least number of earthquakes?
Florida and North Dakota are the states with the fewest earthquakes. Antarctica has the least earthquakes of any continent, but small earthquakes can occur anywhere in the World.
How bad is a 7.0 magnitude earthquake?
| Richter magnitude Description Earthquake effect | 7.0-7.9 Major Can cause serious damage over larger areas. |
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What city has the most earthquakes?
Tokyo, Japan . When accounting for overall exposure to the five major natural catastrophes (river floods, earthquakes, wind storms, storm surges and tsunamis) Tokyo remains first.
What are the biggest earthquakes ever recorded?
| Mag Alternative Name | 1. 9.5 Valdivia Earthquake | 2. 9.2 1964 Great Alaska Earthquake, Prince William Sound Earthquake, Good Friday Earthquake | 3. 9.1 Sumatra-Andaman Islands Earthquake, 2004 Sumatra Earthquake and Tsunami, Indian Ocean Earthquake | 4. 9.1 Tohoku Earthquake |
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Which country has the least risk of earthquakes?
- Qatar. Qatar.
- Saudi Arabia. Saudi Arabia. ...
- Andorra. Andorra. ...
- Sweden. Sweden. ...
- Norway. Norway. ...
- Finland. Finland. ...
- Malta. Malta. ...
- Barbados. Barbados. ...
Why do P waves come first?
P-waves travel 60% faster than S-waves on average because the interior of the Earth does not react the same way to both of them . P-waves are compression waves that apply a force in the direction of propagation.
How do P and S waves travel?
P waves can travel through solids, liquids, and even gases. S waves shake the ground in a shearing , or crosswise, motion that is perpendicular to the direction of travel. These are the shake waves that move the ground up and down or from side to side.
