E. Write true if the statement is correct; and false if the statement is wrong. 1. A tsunami can wash away towns by the shore. 2. Earthquakes change the land features. 3. An earthquake is a sudden trembling or shaking of the ground. 4. Intensity and magnitudes are the same. 5. The vibrations are strongly felt at the epicentre. 6. Earthquakes are not considered natural calamities. 7. Follow earthquake precautionary measures. 8. Intensity is expressed in terms of the damage an earthquake causes in people lives. 9. The focus is the center of the shock found on the fault line. 10. There are three kinds of earthquakes.
Answers & Comments
1.Disease. Tsunami waves and the receding water are very destructive to structures in the run-up zone. The areas close to the coast are flooded with sea water, damaging the infrastructure such as sewage and fresh water supplies for drinking.
2.Effects. Earthquakes often cause dramatic changes at Earth's surface. In addition to the ground movements, other surface effects include changes in the flow of groundwater, landslides, and mudflows. Earthquakes can do significant damage to buildings, bridges, pipelines, railways, embankments, dams, and other structures
3.An earthquake is the sudden movement of Earth's crust at a fault line. The location where an earthquake begins is called the epicenter. An earthquake's most intense shaking is often felt near the epicenter.
4.Magnitude is a measure of earthquake size and remains unchanged with distance from the earthquake. Intensity, however, describes the degree of shaking caused by an earthquake at a given place and decreases with distance from the earthquake epicentre.
5.In most earthquakes, the epicenter is the point where the greatest damage takes place, but the length of the subsurface fault rupture may indeed be a long one, and damage can be spread on the surface across the entire rupture zone
6.A natural disaster is a major adverse event resulting from natural processes of the Earth; examples include firestorms, duststorms, floods, hurricanes, tornadoes, volcanic eruptions, earthquakes, tsunamis, storms, and other geologic processes
7.Stay Safe During an Earthquake
DROP down onto your hands and knees before the earthquake knocks you down. ...
COVER your head and neck (and your entire body if possible) underneath a sturdy table or desk. ...
HOLD ON to your shelter (or to your head and neck) until the shaking stops
8.Intensity scales. The Richter scale measures the magnitude of earthquakes, and the Mercalli scale measures their intensity.
9.The place where a fault ruptures is called the focus or origin, and the point directly above on the earth's surface is called the epicentre. The pulse of energy released by a fault movement radiates outwards as seismic waves, or shock waves.
10.Three Kinds of Earthquakes
Shallow fault earthquakes. A fault is a break in the rock beneath our feet. ...
Subduction zone earthquakes. The largest earthquakes ever recorded are subduction zone earthquakes. ...
Deep earthquakes. Deep earthquakes occur in the subducting ocean slab, deep beneath the continental crust.