Researchers from the Institute of Geodesy and Geophysics in China and at Princeton University in the US state of New Jersey have used seismic-wave data from a 1994 massive earthquake in Bolivia to examine a layer of rock located some 660 kilometres beneath the Earth’s surface, according to Science Daily.

A very strong powerful earthquake is necessary for this type of research, the study team noted, and the Bolivian earthquake is the second-strongest earthquake ever recorded.

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