The focus is the place inside Earth’s crust where an earthquake originates. The point on the Earth’s surface directly above the focus is the epicenter. ... It’s these waves that you feel during an earthquake.
What is the difference between the epicenter and the focus of an earthquake quizlet?
The focus, or hypocenter, is where the earthquake starts, while the epicenter is the point directly above it at the surface of the Earth.
What is the similarities between the epicenter and the focus of an earthquake?
1.An earthquake’s epicenter and focus are both determinants of the origin of the ground movements . 2. Epicenters are located on the surface of the Earth, while the focus is beneath the crust and located right below the epicenter. 3.In locating the origin of the earthquake, seismologists first locate the epicenter.
What is the difference between Epicentre and Hypocentre?
The epicenter is the point on Earth’s surface directly above where an earthquake occurs along a fault. The hypocenter is the actual point at which the earthquake occurs along a fault beneath Earth’s surface.
What is the epicenter of an earthquake?
The epicenter is the point on the earth’s surface vertically above the hypocenter (or focus) , point in the crust where a seismic rupture begins.
What is the major difference between the crust and the lithosphere quizlet?
The crust is the thin, outermost layer of the Earth that is composed differently than the mantle . The lithosphere is a thick layer that contains both the crust and the upper mantle (which is rigid compared to the underlying asthenosphere). Why does a seismic wave travel faster through solid rock than through water?
What is the definition of the focus quizlet?
Point on earths surface directly above the focus of an earthquake; the focus is the area that first ruptures on a geologic fault in an earthquake . ... The amount of energy released from an earthquake.
What is the difference between magnitude and intensity of an earthquake?
Intensity: The severity of earthquake shaking is assessed using a descriptive scale – the Modified Mercalli Intensity Scale . Magnitude: Earthquake size is a quantitative measure of the size of the earthquake at its source.
What is the difference between intensity of an earthquake from its magnitude?
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.
What is the difference between earthquake and aftershocks?
The difference is in the intensity of the quake . The initial quake always has the greatest power, or magnitude, as defined by the Richter scale. Aftershocks are smaller quakes that then occur in the general area after the main quake.
How do you compare the location of the epicenter and the focus?
Epicenter is the location on the surface of the Earth directly above where the earthquake starts . Focus (aka Hypocenter) is the location in the Earth where the earthquake starts.
What is the difference between epicenter and hypocenter based on Associated waves?
Epicenter vs Hypocenter
The difference between Epicenter and Hypocenter is that Epicenter appears on or above the surface of the Earth , whereas Hypocenter appears beneath the surface of Earth. The waves emitted from Epicentre is both body and surface waves while waves emitted from Hypocenter is a body wave only.
What is the difference between epicenter and epicentre?
As nouns the difference between epicenter and epicentre
is that epicenter is (us) while epicentre is (seismology) the point on the land or water surface directly above the focus, or hypocentre, of an earthquake.
What is focus and epicenter?
The focus is the place inside Earth’s crust where an earthquake originates . The point on the Earth’s surface directly above the focus is the epicenter. When energy is released at the focus, seismic waves travel outward from that point in all directions.
What is Epicentre in geography?
epicentre, point on the surface of the Earth that is directly above the underground point (called the focus) where fault rupture commences, producing an earthquake .
What is seismic focus?
The place of origin within the Earth of an earthquake ; usually some more or less restricted area of a fault surface. If the focus is to be some particular point, it is the central point of the area over which fault movement occurred and caused the earthquake.
What is the difference between lithosphere and crust?
What is the difference between the crust and lithosphere? The crust (whether continental or oceanic) is the thin layer of distinctive chemical composition overlying the ultramafic upper mantle . ... The lithosphere is the rigid outer layer of the Earth required by plate tectonic theory.
What is the definition of the focus?
1a : a center of activity, attraction, or attention the focus of the meeting was drug abuse put immigration into focus as a hot topic for commentators. b : a point of concentration. 2 : directed attention : emphasis The focus is on helping the homeless.
What is the major difference between the crust and the lithosphere group of answer choices?
One of these layers is the crust, which is the outermost part of the planet. The lithosphere is not an individual layer, but rather a zone made up of two of the layers of the Earth, which includes the crust.
What is the difference between crust and plates?
The crust is the surface of the Earth. It is a rock layer forming the upper part of the lithosphere . The lithosphere is split into tectonic plates .
Which of the following choices best explains the difference between a crater and a caldera?
Which of the following choices best explains the difference between a crater and a caldera? ... A crater is a small, funnel-shaped depression; A caldera is a large depression that has a diameter of over 1 km.
Which if the following responses best describes the epicenter of an earthquake?
Which of the following responses best describes the epicenter of an earthquake? The point on Earth’s surface directly above the focus of an earthquake . ... As the distance between the epicenter of an earthquake and a seismograph station increases, so does the difference in the arrival times of the P and S waves.
What is the difference between earthquake magnitude and intensity quizlet?
An intensity scale measures that physical damage done by an earthquake. A magnitude scale measures the energy that the seismic waves send out.
What is the difference between a 10 magnitude earthquake and a 4 magnitude earthquake?
The magnitude scale is logarithmic. That just means that if you add 1 to an earthquake’s magnitude, you multiply the shaking by 10. An earthquake of magnitude 5 shakes 10 times as violently as an earthquake of magnitude 4; a magnitude-6 quake shakes 10 times as hard as a magnitude-5 quake; and so on.
What is the difference between the magnitude scale and the Modified Mercalli Intensity Scale?
The Mercalli Scale is based on observable earthquake damage . From a scientific standpoint, the magnitude scale is based on seismic records while the Mercalli is based on observable data which can be subjective. Thus, the magnitude scale is considered scientifically more objective and therefore more accurate.
Where would be the intensity higher near the epicenter or away from the epicenter?
It is a numerical rating based on the relative effects to people, objects, environment, and structures in the surrounding. The intensity is generally higher near the epicenter .
Do earthquakes have foreshocks?
“Foreshock” and “aftershock” are relative terms. Foreshocks are earthquakes that precede larger earthquakes in the same location . An earthquake cannot be identified as a foreshock until after a larger earthquake in the same area occurs.
Can an aftershock be stronger than the earthquake?
Aftershocks are sometimes just as hazardous as the main quake itself. In fact, aftershocks may be so strong that they’re stronger than the main quake . When this happens the aftershock will be renamed as the main quake, and the main quake will be considered a foreshock.
What is a small quake called?
“Foreshock” and “aftershock” are relative terms. ... Aftershocks are smaller earthquakes that occur in the same general area during the days to years following a larger event or “mainshock.” They occur within 1-2...
Which of the following refers to the ground above the focus?
The epicenter is the point on the Earth’s surface directly above the focus.
How is the magnitude and intensity of an earthquake measured?
The Richter scale measures the largest wiggle (amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. ... Intensity is a measure of the shaking and damage caused by the earthquake; this value changes from location to location.
How do you determine the epicenter?
Measure the difference in arrival times between the first shear (s) wave and the first compressional (p) wave, which can be interpreted from the seismogram. Multiply the difference by 8.4 to estimate the distance, in kilometers, from the seismograph station to the epicenter.
How do surface waves and body waves differ?
Body waves can travel through the Earth’s inner layers, but surface waves can only move along the surface of the planet like ripples on water . Earthquakes send out seismic energy as both body and surface waves.
What is the epicenter of associated waves?
The epicenter is the point on the surface of the earth directly above where the earthquake originated . ... Seismic waves fall into two general categories: body waves, which travel through the interior of the earth, and surface waves, which travel only at the earth’s surface.
What is the difference between primary and secondary seismic waves?
The P-wave (primary or pressure wave) is a pulse of energy that travels quickly through the earth and through liquids. ... The S-wave (secondary or shear wave) follows more slowly , with a swaying, rolling motion that shakes the ground back and forth perpendicular to the direction of the wave.
What is the difference between horizontal and vertical earthquake?
On the basis of nature of shaking, earthquakes are classified into vertical and horizontal. In vertical earthquake, the vibration is up and down and in horizontal earthquake, the vibration is lateral . Horizontal earthquake is more devastating because collapsing of buildings occur more in it.
What are earthquakes define focus and Epicentre Class 7?
Focus is the location from where the earthquake originates . Epicentre is the point above the focus on the surface of the Earth.
Why focus is called the origin of the earthquake?
Seismic Waves – The source of an earthquake is called the focus, which is an exact location within the Earth were seismic waves are generated by sudden release of stored elastic energy . The epicenter is the point on the surface of the Earth directly above the focus.
