Question

more information about earthquake for ppt presentation

Answer 1

An earthquake (or quake or tremor) is the shaking of the surface of the Earth. Earthquakes can be extremely violent or so slight that they only register on instruments. They are caused by sudden movements of the Earth's tectonic plates.

The study of earthquakes is called seismology. Earthquakes are usually quite brief, but may repeat. The sudden release of tension in the tectonic plates sends waves of energy that travel through the Earth. Seismology studies the cause, frequency, type and size of earthquakes.

An earthquake under the ocean can cause a tsunami. This can cause just as much death and destruction as the earthquake itself. Landslides can happen, too.

The impact can be measured by a seismometer. It detects the vibrations caused by an earthquake. It puts these movement on a seismograph. The strength, or magnitude, of an earthquake is measured using the Richter scale. The Richter scale is numbered 0-9.Now the largest ever measured is 9.5.

A foreshock is an earthquake that occurs before a larger earthquake, called the mainshock.

An aftershock is an earthquake that occurs after a previous earthquake, the mainshock. An aftershock is in the same region of the main shock but always of a smaller magnitude. Aftershocks are formed as the crust adjusts to the effects of the main shock.

Answer 2

An earthquake is the sudden, rapid shaking of the earth, caused by the breaking and shifting of underground rock. Earthquakes can cause buildings to collapse and cause heavy items to fall, resulting in injuries and property damage.

1. HOW TO STAY SAFE WHEN AN EARTHQUAKE THREATENS

• Secure items, such as televisions, and objects that hang on walls. Store heavy and breakable objects on low shelves.

• Practice Drop, Cover, then Hold On with family and coworkers. Drop to your hands and knees. Cover your head and neck with your arms. Crawl only as far as needed to reach cover from falling materials. Hold on to any sturdy furniture until the shaking stops.

• Create a family emergency communications plan that has an out-of-state contact. Plan where to meet if you get separated.

• Make a supply kit that includes enough food and water for at least three days, a flashlight, a fire extinguisher, and a whistle. Consider each person’s specific needs, including medication. Do not forget the needs of pets. Have extra batteries and charging devices for phones and other critical equipment.

• Consider obtaining an earthquake insurance policy. Standard homeowner’s insurance does not cover earthquake damage.

• Consider a retrofit of your building to correct structural issues that make it vulnerable to collapse during an earthquake.

2.Earthquakes and landslides are frightening and destructive natural disasters. An earthquake is the sudden, rapid shaking of the earth caused by the breaking and shifting of rock deep underground. If an earthquake occurs in a populated area, it has the potential to cause many deaths and injuries along with extensive property damage. Although earthquakes are sometimes believed to be a West Coast phenomenon, there are actually 45 states and territories throughout the United States (including Pennsylvania) that are at moderate to high risk.

 

Landslides and debris flows occur in all U.S. states. In a landslide, masses of rock, earth or debris move down a slope. They can be activated by storms, earthquakes, volcanic eruptions, fires and human modification of land. Landslides and debris flows can move rapidly, striking with little or no warning at avalanche speeds. They also can travel several miles from their source, growing in size as they pick up trees, boulders, cars, and other materials.

Because of the suddenness and unpredictability of earthquakes and landslides, it is important for you and your family to prepare ahead of time.

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