How do earthquakes occur PPT?

The primary cause of an earthquake is faults on the crust of the earth. “A Fault is a break or fracture b/w two blocks of rocks in response to stress.” This movement may occur rapidly, in the form of an earthquake or may occur slowly, in the form of creep.

What is an earthquake presentation?

 Earthquake = Vibration of the Earth produced by the rapid release of energy  Seismic waves = Energy moving outward from the focus of an earthquake  Focus= location of initial slip on the fault; where the earthquake origins  Epicenter= spot on Earth’s surface directly above the focus focusepicenter.

What causes earthquakes for students?

Earthquakes usually occur on the edges of large sections of the Earth’s crust called tectonic plates. These plates slowly move over a long period of time. Pressure slowly starts to build up where the edges are stuck and, once the pressure gets strong enough, the plates will suddenly move causing an earthquake.

How can earthquakes be prevented?

We cannot prevent natural earthquakes from occurring but we can significantly mitigate their effects by identifying hazards, building safer structures, and providing education on earthquake safety. By preparing for natural earthquakes we can also reduce the risk from human induced earthquakes.

What are the 5 steps during an earthquake?

Prepare

• Step 1: Secure Your Space. Secure your space by identifying hazards and securing moveable items.
• Step 2: Plan to be Safe. Plan to be safe by creating a disaster plan and deciding how you will communicate in an emergency.
• Step 3: Organize Disaster Supplies.
• Step 4: Minimize Financial Hardship.

What is earthquake and its effects?

The effects from earthquakes include ground shaking, surface faulting, ground failure, and less commonly, tsunamis.

What are the 5 causes of earthquake?

5 Main Causes of Earthquakes

• Volcanic Eruptions. The main cause of the earthquake is volcanic eruptions.
• Tectonic Movements. The surface of the earth consists of some plates, comprising of the upper mantle.
• Geological Faults.
• Man-Made.
• Minor Causes.

What are the 4 types of earthquakes?

There are four different types of earthquakes: tectonic, volcanic, collapse and explosion. A tectonic earthquake is one that occurs when the earth’s crust breaks due to geological forces on rocks and adjoining plates that cause physical and chemical changes.

What are the 3 main causes of earthquakes?

What’s the main cause of most earthquakes?

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. During the earthquake and afterward, the plates or blocks of rock start moving, and they continue to move until they get stuck again.

How can we prevent earthquake damage at home?

Shelter in place. Cover your head. Crawl under sturdy furniture such as a heavy desk or table, or against an inside wall. Stay away from where glass could shatter around windows, mirrors, pictures, or where heavy bookcases or other heavy furniture could fall over.

What do you learn about earthquakes in college?

Students learn about the types of seismic waves produced by earthquakes and how they move the Earth. The dangers of earthquakes are presented as well as the necessity for engineers to design structures for earthquake-prone areas that are able to withstand the forces of seismic waves.

Which is the focus or the epicenter of an earthquake?

Focus (Hypocenter): Focus is the point on the fault where rupture occurs and the location from which seismic waves are released. Epicenter: Epicenter is the point on the earth’s surface that is directly above the focus ,the point where an earthquake or underground explosion originates. 6. Cont…

What causes the Earth to shake during an earthquake?

An earthquake is the shaking of the surface of Earth due to the sudden release of energy in the Earth’s crust, as a result, seismic waves (also known as S waves)are created. The seismic activities in an area determine the type and intensity of the earthquake. Earthquakes are caused when rocks underground break.

Where do earthquakes occur in the Earth’s crust?

Earthquakes occur in the crust or upper mantle , which ranges from the earth’s surface to about 800 kilometers deep (about 500 miles). The strength of shaking from an earthquake diminishes with increasing distance from the earthquake’s source, so the strength of shaking at the surface from an earthquake that occurs at 500km deep is considerably…