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Question 1. Question 2. How Is The Earthquake Measured? Answer : By using the richter scale and Mercalli scale. Question 3. What Is Richter Scale? Answer : Richter scale is used to measure the total energy released during the earthquake. Question 4. What Is Seismic Belt? Answer : Some regions of the earth are prone to earthquake. These regions are called seismic belts. Question 5. Who Devised Richter Scale? Answer : The place of origin of earthquake is known as epicenter.
Answer : The point at which an earthquake occurs is called Focus or Epicentre. Question 8. Question 9. Question What Is An Earthquake? How Is It Formed? Answer : An earthquake occurs when the structure of the earth shifts and moves. The rocks become soft when they are exposed to the great heat of the interior of the earth, and his the change makes them move.
Because of this movement beneath, we on the surface, feel that the ground is shaking. It is called an earthquake. The volcanic eruptions also cause earthquakes. What Is Mercalli Scale? Answer : Mercalli scale devised in is used to assess the effects of a quake at a particular place, rather than to measure the overall power. Answer : In the Shensi, Shansi and honan provinces of china on February 2, which is estimated to have killed more than , people. Answer : Filling of very large dams, direct injection of fluids into the ground, underground nuclear explosion.
What Is An "earthquake"? Answer : An earthquake occurs when rocks break and slip along a fault in the earth. Energy is released during an earthquake in several forms, including as movement along the fault, as heat, and as seismic waves that radiate out from the "source" in all directions and cause the ground to shake, sometimes hundreds of kilometers away. What Causes Earthquakes? Answer : Earthquakes are caused by the slow deformation of the outer, brittle portions of "tectonic plates", the earth's outermost layer of crust and upper mantle.
Due to the heating and cooling of the rock below these plates, the resulting convection causes the adjacently overlying plates to move, and, under great stress, deform. The rates of plate movements range from about 2 to 12 centimeters per year.
Sometimes, tremendous energy can build up within a single, or between neighbouring plates. If the accumulated stress exceeds the strength of the rocks making up these brittle zones, the rocks can break suddenly, releasing the stored energy as an earthquake. How Do Earthquakes Cause Damage? Answer : Most earthquake damage is caused by ground shaking.
The magnitude or size energy release of an earthquake, distance to the earthquake focus or source, focal depth, type of faulting, and type of material is important factors in determining the amount of ground shaking that might be produced at a particular site.
Where there is an extensive history of earthquake activity, these parameters can often be estimated. In general, large earthquakes produce ground motions with large amplitudes and long durations. Large earthquakes also produce strong shaking over much larger areas than do smaller earthquakes. In addition, the amplitude of ground motion decreases with increasing distance from the focus of an earthquake. The frequency content of the shaking also changes with distance.
Close to the epicenter, both high rapid and low slow -frequency motions are present. Farther away, low-frequency motions are dominant, a natural consequence of wave attenuation in rock. The frequency of ground motion is an important factor in determining the severity of damage to structures and which structures are affected. Answer : No! A common misconception is that of a hole in the ground that opens during an earthquake to swallow up unfortunate victims.
This has nothing to do with reality but is Hollywood's version of earthquakes. After a strong earthquake, some cracks may be seen on the ground or in basements. These are not faults, nor are they crevasses ready to close up again. Theses cracks are probably due to soil settlement caused by the ground shaking. Where Do Earthquakes Occur? Answer : Earthquakes occur all over the world; however, most occur on active faults that define the major tectonic plates of the earth.
The "Ring of Fire" circling the Pacific Ocean, and including Canada's west coast, is one of the most active areas in the world. Answer : The earthquake activity of numerous volcanoes is closely monitored to provide warning signs of an imminent eruption.
Large volcanic eruptions, especially the explosive type, can release huge amounts of energy that can be recorded by seismographs even far from the source.
Recent volcanic activity in Canada has been experienced in BC and the Yukon. Worldwide, the majority of volcanoes and earthquakes are located in the same areas. This relationship is explained through a geological model called plate tectonics. In Eastern and Northern Canada, earthquakes are not related to volcanic processes.
Although volcanic rocks exist in many regions sometimes as old as 2 billion years of age and magmatic bodies can be found the Monteregian Hills of Quebec are 60 million year old intrusive , these magmatic events are just too old to have any relationship with current earthquake occurrences.
No volcanic or magmatic activity is currently underway in these parts of Canada. Answer : For several hours, or even days, after a strongly felt earthquake, it is quite possible that people may feel more shocks.
It is impossible to predict either the number or the magnitude of aftershocks that might occur. These vary greatly from one region to another, according to many factors which are poorly understood. Can Earthquakes Be Predicted? Answer : With the present state of scientific knowledge, it is not possible to predict earthquakes and certainly not possible to specify in advance their exact date, time and location, although scientists have carried out research on a wide variety of attempted prediction methods.
However, the rates of earthquakes in particular regions, expressed in terms of probabilities, can be usefully estimated. Canada, along with other countries, is working to minimize damage and injuries through the implementation of modern earthquake-resistant standards so people will be protected whenever and wherever an earthquake occurs.
Answer : Although cold temperatures greatly affect the ground near the surface, it has no effect at greater depths. Near the surface, freeze and thaw cycles can weaken and break rock due to high water pressure. However, this is a phenomenon limited to near surface soil. Consider a mine: the temperature inside the mine will be influenced by surface temperature only for about the first 50 m.
Deeper in the mine the temperature will be influenced by the internal heat of the earth - a temperature that is relatively constant throughout the year. The hypocenter the place where displacement occurs along a rock fracture of an earthquake is generally located several km below the surface on average, between km in Eastern Canada , where the surface temperature would have no influence.
Furthermore, the principle causes of earthquakes movement of tectonic plates, volcanoes, etc. These microseisms are not earthquakes as they are caused by cracking ice and movements of ice blocks one against another.
They are cryoseisms, also known as frost quakes, and can only be felt close to the body of water from which they originate. Such ice cracks can sometimes be detected by a seismograph if it is located close to the body of water.
Seismic trace of a typical frost quake recorded on the vertical component of the seismic station in Sadowa, Ontario, near Georgian Bay SADO , January 18, at pm, a very cold night 12 frost quakes were recorded within 2 hours that night. A seismologist immediately recognizes the nature of such an event by the single frequency contained in the record. Answer : No, there are no months that have more earthquakes than others. Examining the list of Canadian or global earthquakes, there isn't a season that stands out as having an increased number of earthquakes.
The explanation for this can be found by considering that the mechanisms that cause earthquakes are independent of seasonal temperature changes see effects of cold temperatures on earthquakes , and independent of the changes in position of the Earth in the solar system at different times of the year.
It is internal geological forces that play the most important role in generating earthquakes. Most large earthquakes are as a result of immense continental plates, called tectonic plates, that move, one with respect to another. The driving force for this movement is found in the Earth's mantle in the form of convective currents. These currents carry the tectonic plates around the Earth generating earthquakes and volcanic eruptions.
The movement of the plates creates strain which is then accumulated in faulted areas causing earthquakes. Both the movement of the plates and the accumulation of strain along faults are continual processes independent of the time of year. Since the distance between the Earth and Sun changes throughout the year due to the elliptical trajectory of the Earth around the Sun, it seems possible that the attractive gravitational forces between the two bodies might cause extra strain in the Earth's crust.
However, strain models have shown that this extra force is insignificant compared to the tectonic force present. Since the temperature and gravitational forces are the only forces changing with the seasons, seasonal effects can be eliminated as a factor in influencing the frequency of earthquakes. Can People Cause Earthquakes? Answer : Yes!
virtual earthquake answer key
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An earthquake is a sudden, rapid shaking of the ground caused by the breaking and shifting of rock beneath the Earth's surface. This shaking can cause damage to buildings and bridges; disrupt gas, electric, and phone service; and sometimes trigger landslides, avalanches, flash floods, fires, and huge, destructive ocean waves tsunamis. Buildings with foundations resting on unconsolidated landfill, old waterways, or other unstable soil are most at risk. Buildings or trailers and manufactured homes not tied to a reinforced foundation anchored to the ground are also at risk since they can be shaken off their mountings during an earthquake. All 50 states, five U. Earthquakes can occur at any time of the year. At times, the movement is gradual.
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See the table of major earthquakes. Over the centuries, earthquakes have been responsible for millions of deaths and an incalculable amount of damage to property. These phenomena are primarily responsible for deaths and injuries. Very great earthquakes occur on average about once per year. Earthquake waves, more commonly known as seismic waves , are vibrations generated by an earthquake and propagated within Earth or along its surface.
Earthquake Worksheet Middle School Pdf. Some of the worksheets below are Tectonic Plates Worksheets, predicting tectonic activity, definition of plate composition, plate movement, types of plate boundary, continent-continent collision, hands-on activities, … with colorful diagrams along with questions and answers at the end of each page. Students use their reference tables to answer questions regarding earthquake epicenters and time of origin.
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A property will only qualify for IFV where subsidence to the insured land has caused it to become more vulnerable to flooding as a result of the Canterbury earthquakes. If a property was already prone to flooding prior to the earthquake, and the flooding vulnerability has not changed, then it will not qualify. Accordingly, the following exceptions have been created:. Properties that meet thresholds 1 and 3 but do not meet threshold 2 i. Properties that meet thresholds 1 and 2 but do not meet threshold 3 i. Properties in areas of known tectonic uplift where there is differential subsidence i.
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. F ew natural events disrupt human society more than large earth quakes. To cope with the all-too-frequent destruction caused by earthquakes, people have long sought to improve their practical knowledge about where and when such events might occur, and what happens when they do. Science has shown that seismic activity can be understood in terms of a basic machinery of deformation that shapes the face of the planet. Consequently, the pragmatic inquiry into the causes and effects of earthquakes has become increasingly fused with the quest for a more fundamental understanding of the geologically active Earth. This report surveys all aspects of earthquake science, basic and applied, from ancient times to the present day 1.
DLESE Discover Our Earth — Portal for teachers and students for learn the basics about earthquakes, volcanoes, plate tectonics, topography, and sea level changes. Purdue Univ. Earthquake Quiz — online quiz Univ. The Geological Society Earthquakes — Information on the basics of earthquakes. Bolt Online Companion — links related to subjects covered in book W.
Earthquakes MCQ questions and answers, earthquakes quiz answers PDF to practice grade 8 geography test 5 for online classes. Learn what are earthquakes, geography: earthquakes test prep for online school courses. Free geography study guide for online learning geography earthquakes quiz questions for online study.