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distance of earthquake formula. Therefore the earthquake has an epicenter distance of 34 10 3 km or 3400 km. Richter chose the zero level of Ao to be 1 µm or 0001 mm at a distance of 100 km from the earthquake epicentre.
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ML log 10A log 10A0 d. Therefore the earthquake has an epicenter distance of 34 10 3 km or 3400 km. Thus an earthquake with trace amplitude A1 mm recorded on a standard Wood-Anderson seismograph at a distance of 100 km is assigned magnitude 3.
Up to 1000 km.
The surface-wave magnitude Ms has also been connected with the surface energy Es of an earthquake by empirical formulas. The original Richter scale formula that is used to calculate the magnitude of any earthquake is as follows. Magnitude is the physical size of the earthquake see cross-section below the length L x the width W x the slip D. Richter chose the zero level of Ao to be 1 µm or 0001 mm at a distance of 100 km from the earthquake epicentre.
