After Bsc in 1952 and a doctorate in géosciences in 1958 with the University of Tokyo, it leaves to post-doctoral Caltech like research fellow between 1958 and 1960. He becomes professor associated in 1963 with the Research institute on the Seisms with the Université with Tokyo. In 1966, he becomes off professor of physique to the Massachusetts Institute Technology with the the United States.
In 1984, it joined the the University of California of the South where it occupies the pulpit of the Keck foundation. It is under its impulse that there the center of the seisms of the south of California is created.
In 1995, it joined then the observatory volcanologic of the Piton of the Furnace, with the Meeting. It leaves in semi-retirement in 2000 but remains in the island. In 2005, it dies in the commune of the Tampon after having made an accidental fall in full street.
Keiiti Aki is surely the seismologist more quoted of second half of the 20th century. He was a pioneer in many disciplines of seismology like the sismogénèse, the Tomographie or ic seismology Volcan. He introduced for the first of the fundamental laws of scale and the concept of moment seismic. He also calculated the first dynamic model to simulate the strong movements of the ground at the time of a Séisme.
Author or joint author of more than 200 articles in seismology, he is also the author or the editor of several specialized books. He is in particular with Paul Richards the author of the “bible” of modern seismology: “Quantitative seismology”, published in 1980.
He was member many learned societies like the national Academy of sciences of the the United States (NAS) or the European Union of geophysics (EGU). For its work, it had received many distinctions.
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