What is the name of the instrument used for measuring earthquake?

seismograph

What is earthquake focus?

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 are the major earthquake zones?

Where do earthquakes occur?

• The world’s greatest earthquake belt, the circum-Pacific seismic belt, is found along the rim of the Pacific Ocean, where about 81 percent of our planet’s largest earthquakes occur.
• The Alpide earthquake belt extends from Java to Sumatra through the Himalayas, the Mediterranean, and out into the Atlantic.

Which human activities can cause earthquake?

Beyond common energy industry practices leading to the most human-made earthquakes across the globe, other quake-causing activities include building construction, carbon capture and storage, nuclear explosions, geothermal operations and research experiments that test fault stress.

How Epicentre is located?

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 earthquake and its types?

There are many different types of earthquakes: tectonic, volcanic, and explosion. The type of earthquake depends on the region where it occurs and the geological make-up of that region. The most common are tectonic earthquakes.

What are the main earthquake belts?

There are three main seismic belts: the Circum-Pacific seismic belt (“Ring of Fire”), Alpide belt, and the Oceanic Ridge belt. Most major tectonic earthquakes occur in the Circum-Pacific seismic belt (USGS).

What is the difference between magnitude and intensity?

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 are the distinguishing features of the major earthquake belt?

The edges where these plates move against one another are the location of interplate earthquakes that produce the seismic belts. Island arcs, mountain chains, volcanism, deep ocean troughs, and oceanic ridges are often features of seismic belts.

What is Epicentre and 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.

Where is an earthquake 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. See also epicenter.

What do you mean by earthquake?

Earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks.

What are the features of a earthquake?

Buildings may sway, tilt, or collapse as the surface waves pass. Ground shaking from earthquakes can collapse buildings and bridges; disrupt gas, electric, and phone service; and sometimes trigger landslides, avalanches, flash floods, fires, and huge, destructive ocean waves (tsunamis).

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.

What is the similarities of epicenter and focus?

What is the difference between the focus and epicenter of an earthquake? The focus is the point within the earth where seismic waves originate; it is centered on the part of the fault that has the greatest movement. The epicenter is on the earth’s surface directly above the focus.

What is the introduction of earthquake?

An earthquake is a sudden movement of the Earth, caused by the abrupt release of strain that has accumulated over a long time. For hundreds of millions of years, the forces of plate tectonics have shaped the Earth as the huge plates that form the Earth’s surface slowly move over, under, and past each other.

What are the three types of plate tectonics?

Tectonic Plates and Plate Boundaries

• There are three main types of plate boundaries:
• Convergent boundaries: where two plates are colliding.
• Divergent boundaries – where two plates are moving apart.
• Transform boundaries – where plates slide passed each other.