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Membaca Report Text About Earthquake
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Report Text About Earthquake Example
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Report Text Earthquake
What Is An Earthquake?
Simply, earthquakes are the rumblings, shaking or rolling of the earth’s surface. It is usually what happens when two blocks of the earth suddenly slip past one another, or break apart from each other as a result of tension caused by prolonged energy build up. Earthquakes are also called temblors.
Earthquakes come in many forms. It can be felt as a shock under your feet, or may be very powerful and destructive enough to flatten an entire city. They can happen anywhere, land or sea.
Foreshocks, Mainshocks and Aftershocks: Sometimes, there are smaller shocks that occur before (foreshock) and after (aftershock) a main earthquake (mainshock). Sometimes foreshocks are so big and scientists are unsure if it is the main shock. Foreshocks and aftershocks can occur for days, weeks and months of a main earthquake.
Example of Report Text About Earthquake
What causes Earthquakes?
Earthquakes are the vibrations caused by rocks breaking under stress. The underground surface along which the rock breaks and moves is called a fault plane.
The size or magnitude of earthquakes is determined by measuring the amplitude of the seismic waves recorded on a seismograph and the distance of the seismograph from the earthquake. These are put into a formula which converts them to a magnitude, which is a measure of the energy released by the earthquake. For every unit increase in magnitude, there is roughly a thirty-fold increase in the energy released. For instance, a magnitude 6.0 earthquake releases approximately 30 times more energy than a magnitude 5.0 earthquake, while a magnitude 7.0 earthquake releases approximately 900 times (30×30) more energy than a magnitude 5.0.
A magnitude 8.6 earthquake releases energy equivalent to about 10 000 atomic bombs of the type developed in World War II. Fortunately, smaller earthquakes occur much more frequently than large ones and most cause little or no damage.
Earthquake magnitude was traditionally measured on the Richter scale. It is often now calculated from seismic moment, which is proportional to the fault area multiplied by the average displacement on the fault.
The focus of an earthquake is the point where it originated within the Earth. The earthquake epicentre is the point on the Earth’s surface directly above the focus.
Report Text About Earthquake
An earthquake is a sudden shaking or trembling vibrations of the ground produced in the earth’s crust when rocks in which elastic strain has been building up suddenly rupture, and then rebound. The vibrations can range from barely noticeable to catastrophically destructive where the surface of the Earth can be altered by thrusting up cliffs or opening great cracks in the ground.
Earthquakes are caused by various conditions:
- Sudden earth movements along geological faults. A fault is a crack or rupture in the earth along which rocks on each of it’s two side move past each other. There are two kinds of quakes, tectonic(plates that make up the earth’s crust cause a fault) and subduction-zone quakes( one plate slides beneath the other plate). Subduction-zone quakes account for nearly half of the world’s destructive seismic events and 75 percent of the earth’s seismic energy.
- Volcanic activity when lava builds up to high pressures and energy is release in the form of an eruption.
- Other causes include meteorite impacts, undersea landslides and explosion of nuclear bombs
Many earthquakes occur each year, on average greater than 800,000, but most are small and not felt by humans. A severe earthquake, with a magnitude of greater than 8.0, can be expected every 8 to 10 years. But a significant number of smaller earthquakes, which are still capable of destruction, occur each year.
3 Contoh Report Text About Earthquake
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