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In 1883 a scale that included ten levels of intensity was developed in Europe. The scale was refined in 1902 by Guiseppe Mercalli,an Italian seismologist.-mercallis scale expanded to 12 levels. In 1931 two american scientists, H. O. Wood and Frank Neumann, modified Mercallis version-this version is still used today

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Q: Who refined and modifeid the scale to measure intensity?
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