What is difference between seismic focus and epicenter?
seismic focus is the point from where the waves arise. it is the point where fault occurs. epicenter is the point above earth surface from the seismic focus. epicenter is vertically above seismic focus above earth surface.
What is an epicenter and focus?
The hypocenter is the point within the earth where an earthquake rupture starts. The epicenter is the point directly above it at the surface of the Earth. Also commonly termed the focus.
What do you mean by Epicenter?
The epicenter, epicentre (/ˈɛpɪsɛntər/) or epicentrum in seismology is the point on the Earth’s surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates.
What is focus and Epicentre?
The point inside the crust where the pressure is released is called the focus . The point on the Earth’s surface above the focus is called the epicentre . Earthquake energy is released in seismic waves.
What is focus and epicenter Class 7?
Epicentre is the point above the focus on the surface of the Earth. Focus lies inside the Earth’s surface. Epicentre lies on the Earth’s surface. 3.It is the place from where the earthquake starts.
What is focus in earthquake class 8?
The point at which the Earthquake happens below the Earth’s Surface is the Focus of the Earthquake. At the focus the waves generated and that waves moved in a large area to spread the damage of Earthquake.
What causes an earthquake Class 8 answer?
Answer: Most of the earthquakes are caused by the movement of the tectonic plates. The heat set up by the mantle causes these plates to move continuously. Sometimes, the movement causes the edges of these plates to grind against each other, or to slide under each other or to move apart from each other.
What is an Epicentre Class 8?
The epicenter is the point on the Earth’s surface at which the earthquakes and explosions originate. The epicenter lies above the hypocenter. The body waves act inside the earth and are categorized into S waves and P waves. The surface waves are the waves that arise on the surface of the earth.
What is meant by Epicenter Class 9?
The point on the earth’s surface directly above the focus is called epicentre.
What is blindspot Class 8?
Blind spot is a small area of the retina insensitive to light where the optic nerve leaves the eye . When the image of an object is formed at the blind spot in the eye, it cannot be seen by the eye. Blind spot is not sensitive to light because there are no light-sensitive cells like rods or cones in this region.
What Seismology means?
Seismology, scientific discipline that is concerned with the study of earthquakes and of the propagation of seismic waves within the Earth. A branch of geophysics, it has provided much information about the composition and state of the planet’s interior.
What is seismology used for?
Seismology is the study of earthquakes and seismic waves that move through and around the earth. A seismologist is a scientist who studies earthquakes and seismic waves. What Are Seismic Waves? Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion.
What are the uses of seismology?
From an interpretation of the waves created by the energy source and recorded by the seismograph, the detection of geological structures in which oil may be trapped is possible. Seismic methods are sometimes used to locate subsurface water and to detect the underlying structure of the oceanic and continental crust.
What do we use seismology for?
Seismic surveys use reflected sound waves to produce a “CAT scan” of the Earth’s subsurface. Seismic surveys can help locate ground water, are used to investigate locations for landfills, and characterize how an area will shake during an earthquake, but they are primarily used for oil and gas exploration.
What are the elements of seismology?
Syllabus
- Earthquake Hazards and Engineering seismology. Earthquake hazards.
- Earthquake Sources, Magnitudes and Waves.
- Earthquakes Instrumentation and Recording.
- Seismic Zonation and Hazard Analysis.
- Seismic site characterization, site effects and liquefaction.
- Seismic hazard parameters and zonation mapping.
What are the 3 things shown in a seismograph?
To overcome this problem, modern seismograph stations have three separate instruments to record horizontal waves – (1) one to record the north-south waves, (2) another to record east-west waves, and (3) a vertical one in which a weight resting on a spring tends to stand still and record vertical ground motions.
Who are some seismologist?
Principal functions. Seismologists are Earth scientists, specialized in geophysics, who study the genesis and the propagation of seismic waves in geological materials.
Which ocean has the most earthquakes?
Pacific Ocean
Who discovered the first earthquakes?
Richard Oldham realised that there were at least two types of seismic waves that travelled at different speeds. We know these now as P-waves and S-waves.
What was the longest earthquake?
Valdivia Earthquake