Earthquake Magnitude Scale

Magnitude is expressed in whole numbers and decimal fractions. Sensitive seismographs can record earthquakes with magnitudes of negative value and have recorded magnitudes up to about 9 0. Denoted explicitly with m w or mw and generally implied with use of a single m for magnitude is a measure of an earthquake s magnitude size or strength based on its seismic moment a measure of the work done by the earthquake it was defined in a 1979 paper by thomas c.

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Earthquake magnitude scale. Magnitude is based on measurement of the maximum motion recorded by a seismograph several scales have been defined but the most commonly used are 1 local magnitude ml commonly referred to as richter magnitude 2 surface wave magnitude ms 3 body wave magnitude mb and 4 moment. The richter scale also called the richter magnitude scale or richter s magnitude scale is a measure of the strength of earthquakes developed by charles f. The first widely used method the richter scale was developed by charles f.

An earthquake with a magnitude of 4 4 on the richter scale struck near mizoram s champhai region on tuesday said the national centre for seismology ncs. Hanks and hiroo kanamori similar to the local magnitude scale m l defined by. There are a number of ways to measure the magnitude of an earthquake.

Because of various shortcomings of the m l scale most. Because of the logarithmic basis of the scale each whole number increase in magnitude represents a tenfold increase in measured amplitude as measured on a seismogram. As defined an earthquake magnitude scale has no lower or upper limit.

Usually not felt but can be recorded by seismograph. Richter in 1934 it used a formula based on amplitude of the largest wave recorded on a specific type of seismometer and the distance between the earthquake and the seismometer. Earthquake size as measured by the richter scale is a well known but not well understood concept.

The magnitude is a number that characterizes the relative size of an earthquake. For example a magnitude 5 3 is a moderate earthquake and a 6 3 is a strong earthquake. Estimated number each year.

The 1906 san francisco earthquake for example had a richter magnitude of 8 25. Richter and presented in his landmark 1935 paper where he called it the magnitude scale. Often felt but.

The idea of a logarithmic earthquake magnitude scale was first developed by charles richter in the 1930 s for measuring the size of earthquakes occurring in southern california using relatively high frequency data from nearby seismograph stations. This was later revised and renamed the local magnitude scale denoted as ml or m l. An earthquake of 3 3 magnitude on the richter scale shook parts of bharuch town and nearby areas of gujarat with its epicentre in jhagadia taluka on m.

The moment magnitude scale mms.