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Legends Of Seismology
Essay specific features
Written by:
Helen W
Date added:
July 28, 2014
Level:
University
Grade:
B
No of pages / words:
2 / 461
Was viewed:
6672 times
Rating of current essay:
Essay content:
Perhaps his best known contribution was the precise location of the core of the Earth and the identification of its elastic properties. Other major contributions include the travel-time curves; the discovery of very long-period seismic waves with large amplitudes that circle the Earth; the identification of differences in crustal structure between continents and oceans, including the discovery of a significantly thin crust in the Pacific; the discovery of a low-velocity layer in the mantle (which he interpreted as the zone of decoupling of horizontal motions of the surficial parts from the deeper parts of the Earth); the creation of the magnitude scale for earthquakes; the relation between magnitudes and energies for earthquakes; the famous universal magnitude-frequency relation for earthquake distributions; the first density distribution for the mantle; the study of the temperature distribution in the Earth; the understanding of microseisms; and the structure of the atmosphere...
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In 1936, she discovered that the Earth has a small inner core. Then she "saw" the area where earthquake waves did not pass through and reasoned that there must be an outer liquid core and an inner solid core. She was the first president of the European Seismological Commission. Lehmann was Denmark's only seismologist for two decades...
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