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helioseismologyseismographseismic surveyRichter scalegeophonereflection seismologyseismometerseismic detectordigital seismograph stationearthquake hazard mapmarine geophysicsgeomagneticsdipolar hypothesisdynamo theorymagnetic surveydip circle
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Key People

Inge Lehmann
Danish seismologist

Clarence Edward Dutton
American geologist

John Michell
British geologist and astronomer

Charles F. Richter
American physicist

John Milne
British scientist

Harry Fielding Reid
American seismologist

Richard Dixon Oldham
British geologist

Beno Gutenberg
American seismologist
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