how are earthquakes measured?

Answer 1

There are two different ways that earthquakes are measured.

The first way is to measure the "magnitude" of the earthquake using a seismograph. This type of measurement uses the richter scale, and measures how much the ground actually moves.

The second way is to measure the "intensity" of the earthquake. This method describes the amount of destruction caused by the earthquake and uses the modified mercalli scale.

Answer 2

Since seismologists cannot directly observe rupture in the Earth's interior, they rely on geodetic measurements and numerical experiments to analyze seismic waves and accurately assess severity of earthquakes. The severity of an earthquake can be measured in terms of magnitude and intensity. For that seismologists use two fundamentally different but equally important types of scales. The original force or energy of an earthquake is measured on a magnitude scale, while the intensity of shaking occurring at any given point on the Earth's surface is measured on an intensity scale.

While the non-specialized media will often refer to the magnitudes of earthquakes as being reported on the Richter scale, the magnitudes reported nowadays are actually on the moment magnitude scale. The older Richter scale is not adapted for larger earthquakes.

The analyses of earthquake severity allow scientists to estimate the locations and likelihoods of future earthquakes, helping identify areas of greatest hazard and ensure safety of people and infrastructure located in such areas.

You could get more information from the link below...

Answer 3

Seismometer - are used by seismologists to measure and record the size and force of seismic waves. By studying seismic waves, geologists can map the interior of the Earth, and measure and locate earthquakes and other ground motions. The term seismograph is usually interchangeable, but seismometer seems to be a more common usage.

The seismometer was first invented by Zhang Heng in China in 132AD. Later John Milne invented the horizontal pendulum seismograph at the Imperial College of Engineering in Japan in 1880. This marked the beginning of modern seismology.

and also by -

Richter magnitude test scale (or more correctly local magnitude ML scale) assigns a single number to quantify the size of an earthquake. It is a base-10 logarithmic scale obtained by calculating the logarithm of the combined horizontal amplitude of the largest displacement from zero on a seismometer output. Developed in 1935 by Charles Richter in collaboration with Beno Gutenberg, both of the California Institute of Technology, the scale was originally intended to be used only in a particular study area in California, and on seismograms recorded on a particular instrument, the Wood-Anderson torsion seismometer.

Answer 4

if I'm right with the spelling seismograph: it is an apparatus that enables to measure the movement of the earth's crust while it vibrates as the consequence of an earthquake; the result of which is a line similar to a lye detector; it measures the frequency (number of vibration per minute) and the amplitude (how violent the shakes are)

Answer 5

earthquakes are measured on a richter scale

Answer 6

Using Richter scale

Answer 7

It is intensity it is measure by Richter Scale and the instrument which measure this intensity is called seismograph.

Answer 8

They are measured on a seismograph...not sure that is spelled right to determine their place on the Richter scale of quakes...........

Answer 9

on a richter scale which measures seismic activity.

Answer 10

Richter scale, or a magnitude scale, couldn't you google this?