Sagot :
In science 10 unit 1 module 1 activity 2, the title of the activity is "Let's Mark the boundaries" which tells us the relationship between the location of the earthquake epicenter, volcanoes, and mountain ranges. Based on the map presented, the location of the earthquake epicenter are not randomly distributed over the earth's surface. Most earthquake epicenter are concentrated in a narrow zone . Most of the earthquake epicenter are located at the edge of some continents like western region of north and south america. Earthquakes also surrounds the pacific plate. There are also concentrated earthquake occur along the Himalayas mountain over India. And if you try to compare the location of earthquake epicenter and the location of active volcanoes, all areas with active volcanoes have an earthquake epicenter but not all areas with earthquake epicenter have active volcanoes.
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Earthquake
Slippage along the fault or the plate boundary, releases tremendous amount of energy which causes vibration on the surface of the Earth which is commonly known as Earthquake.
Types of Earthquake
- Tectonic Earthquake
- Volcanic Earthquake
Tectonic Earthquake
Tectonic earthquake is the result of the movement of the plate which produces tremendous amount of energy that travels in all direction away from the epicenter causing shaking on the surface.
Volcanic Earthquake
Volcanic Earthquake occurs due to the volcanic activity of erupting volcanoes. Volcanic activity due to the rising of magma on the surface of the earth causes shaking in surrounding areas known as volcanic earthquake.
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Types of Seismic waves produce during Earthquake
- Body wave
- Surface wave
Body waves can travel in the interior of the earth known as primary wave and secondary wave. Primary wave is the fastest to travel and it can travel in both solid and liquid medium. Secondary wave travel's slower than primary wave and it can only travel in solid not in liquid. The information provided by body waves gives ideas on what made up the inner layer of the earth.
Surface wave on the other hand is composed of Love wave and Rayleigh wave. Love wave is faster than Rayleigh wave but, it causes majority of the damage on the surface of the earthquake. Love wave moves the ground in a side to side horizontal motion, like that of a snake's causing the ground to twist which is the main reason why it causes more damage compared to the rest of the waves released during earthquake. On the other hand, Rayleigh wave rolls along the ground just like a wave rolls across the ocean.
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Studying earthquake's epicenter is one of the basis of the scientist in dividing the Earth's lithosphere into several segments called plates. Majority of the earthquake occur the plate boundary.
Three Types of Plate boundary
- Convergent Boundary
- Divergent Boundary
- Transform Fault Boundary
Convergent Boundary
Occurs when two plates moves towards each other. It can be continental to continental convergence, oceanic to oceanic convergence, continental to oceanic convergence.
Divergent Boundary
Occurs when plates moves away from each other.
Transform Fault Boundary
Occurs when the plate slide past each other.
Locating the earthquake's epicenter provides important data in identifying areas which are prone to earthquake so that necessary precaution will be taken to prevent lost of life and other casualties.