Latest Seismic scales Stories
The region of Chile that was rocked by an earthquake last February could be at risk for a larger series of tremors.
IMMENDINGEN, Germany and MANTECA, Calif., Aug.
Triggered tremors occur even on the opposite side of the Earth
Sunday's earthquake in Sumatra had a preliminary magnitude of 9.0, classifying it as a great quake and making it the strongest in 40 years.
The Richter scale assigns a single number to quantify the amount of seismic energy released by an earthquake. The scale uses a base-10 logarithm by calculating the logarithm of the combined horizontal amplitude of the largest displacement from zero on a particular type of seismometer. A earthquake measuring 5.0 on the Richter scale has a shaking amplitude 10 times larger than one that measures 4.0. The moment magnitude, calibrated to give generally similar value for medium-sized...