en.wikipedia.org/wiki/Richter_magnitude_scale

The Richter magnitude scale (also Richter scale) assigns a magnitude number to
quantify the energy released by an earthquake. ... Richter established a
magnitude 0 event to be an earthquake that wou...

earthquake.usgs.gov/learn/topics/how_much_bigger.php

May 9, 2016 ... A magnitude 8.7 earthquake is 794 times BIGGER on a seismogram ... knocks
down buildings, this is really the more important comparison. ... magnitude 5.8 to
equal the energy released by one magnitude 8.7 event. ... Therefore, using the
shortcut shown eartlier for the amplitude calculation, the energy is,.

earthquake.usgs.gov/learn/topics/measure.php

Jun 6, 2016 ... The magnitude of an earthquake is determined from the logarithm of the ...
release of about 31 times more energy than the amount associated with ... of
earthquakes of any distance and of focal depths ranging between 0 and 700 km.
... of 4-5 s, but recent observations are generally of 1 s-period P waves.

www.okgeosurvey1.gov/magnitude_e.html

Magnitude is a measure of the amount of energy released during an earthquake.
... 5 and about 1000 times more energy than an earthquake of magnitude 4.

peer.berkeley.edu/education/files/follow_up_activities/EarthquakePowerSoln.pdf

Use the Richter scale to compare the size and magnitude of earthquakes. ... 5.0–
5.9 moderate. 6200. 4.0–4.9 light. 49,000. 3.0–3.9 minor. *Earthquakes
measuring less than 3.0 are not included because approximately 9000 occur ... 5.
How much more energy did the 1920 earthquake release compared with the
second.

www.sosmath.com/algebra/logs/log5/log56/log56.html

In 1935 Charles Richter defined the magnitude of an earthquake to be ... The
largest had magnitude of 8.9 on the Richter scale, and the smallest had
magnitude 0. ... For example, an earthquake of magnitude 6 is ten times stronger
than an ... How many times more intense was the San Francisco earthquake
described in ...

geology.teacherfriendlyguide.org/index.php/hazards-w/hazards-earthquakes-w

Magnitude (M) is the measure of the energy released by the earthquake, ... would
have 10 times the amplitude, and release 32 times the energy of a M8.0
earthquake. ... Alaska has more earthquakes than all of the other states
combined. ... The following table lists the number of earthquakes of M3.5 or
greater from 1974 to ...

www.opb.org/news/series/unprepared/how-powerful-is-a-90-earthquake-/

Mar 9, 2015 ... Magnitude 3.9 = 1 grain of sand; Magnitude 4 = 3 grains; Magnitude ... A
magnitude 9.0 earthquake doesn't release nine times as much energy as a
magnitude 1.0 ... 11,099,511,600,000 times as much energy as a magnitude 1.0.
... More From Unprepared: Will We Be Ready For The Megaquake In Oregon ...

www.pnsn.org/outreach/about-earthquakes/magnitude-intensity

However, earthquake magnitude has no physical units, nor a meaningful 0. ...
Further refinements for more modern construction were published in 1931 by the
American ... An earthquake that measures 5.0 on the Richter scale has a shaking
amplitude ... to an energy release of 31.6 times greater than one that measures
4.0.

study.com/academy/lesson/using-the-richter-scale-to-measure-earthquakes.html

In this video lesson, you will learn about earthquake magnitude and how it is
measured. ... 0:49 Measuring Ground Shaking; 2:51 The Moment Magnitude
Scale; 4:01 .... times more energy for the first step and then 32 times more energy
than that ... explosive while a magnitude 5 releases energy equivalent to
1,800,000 kg, ...