The newest medal understands the contributions to help you simple geophysics and for unselfish cooperation inside lookup

Keiiti Aki

Keiiti Aki was granted the newest 2004 William Bowie Medal at the AGU Fall Meeting Remembers Service, that was held toward , from inside the San francisco bay area, California.


Kei Akis scientific studies have stretched the fresh new frontiers out of seismology getting 50 years. The guy developed the fresh new electronic handling from seismic investigation so you can infer Earth structure and you may services of one’s earthquake provider. Much of everything we find out about higher earthquakes follows from his really works.

He was the first to measure seismic time (to your 1964 Niigata quake); Aki minute has while the replaced Richter magnitude as fundamental size off disturbance dimensions. He discovered the basic scaling rules having seismic spectra you to definitely resolved inconsistencies one of some other magnitude balances, in which he recommended real varieties of earthquakes getting heterogeneous blame rupture. Which performs shared significantly to both basic knowledge of new rupture process plus the basic comprehension of strong crushed movements.

He elucidated the new sprinkling and you will attenuation processes one govern the brand new propagation of higher-regularity seismic waves, from which the guy derived the brand new techniques for calculating quake dimensions, sprinkling distributions, and you can inherent attenuation details. The guy showed, as an instance, that intrinsic attenuation must decrease during the highest frequencies.

The guy put up of several book tips for discussing regions of seismic swells, in addition to 100 % free-oscillation breaking, Gaussian beams, and boundary integrated measures. Into the for every single case, he and his awesome children successfully put such solutions to pull new types of guidance out of seismograms.

He developed travel-go out tomography as a way to study lithospheric build below heavy seismic arrays, posting seminal files almost a decade prior to the widespread application so you can in the world seismology. He situated the brand new seismological perspectives into eruptive procedure, such as the relationship out of seismicity and harmonic tremor so you can magma injections and you may eruption. The guy perceived fault-zone directed swells and put the propagation attributes in order to constrain the new width and elasticity of one’s wreck areas to faults.

Because impressive because abbreviated number may appear (way more topics could easily be extra), it does not express Keis correct effect inside geoscience society. He literally published the book Quantitative Seismology, the quintessential influential book and you can site instructions in the history of industry, that he coauthored which have Paul Richards when you look at the 1980.

Due to the fact an instructor and mentor, he entrained of several bright people in his journey to understand the brand new productive Earth, creating more than fifty Ph.D.s exactly who today take secret positions for the seismology all over the world. His victory when you look at the guiding more youthful experts stems in part in the breadth out-of his wisdom, and of his remarkable personal attributes-appeal, laughs, and you can an intense regard with the balance and poetry of your own sheer industry.

Keis hushed leadership into the seismology features shown the newest refinement and you will electricity off unselfish venture from inside the search. He has held of a lot ranking: chairman of Seismology Element of AGU, chairman of one’s Seismological Community regarding America, settee of your own NAS Committee into the Seismology.

But his ideal leadership achievement is the creation of this new South California Earthquake Cardiovascular system during the 1991. As the founding director, Kei articulated a plans getting SCEC where testing of the disciplinary working communities might be woven together with her towards the a system-peak ‘learn design having quake threat and you can chance during the South Ca. The proprietor-design style resulted in of several enhances into the seismic possibilities investigation, including the chatib incorporation out of GPS analysis on long-name disturbance forecasting, and it also will continue to guide the growing SCEC cooperation.

Particular researchers loom very large within their fields that people need to individual of William Bowie Medal, is one of the giants.


William Bowie, once which the fresh Bowie medal is called, try distressed by the searching for away from seismologists during the early 1920s you to earthquakes is generally going on during the deepness away from almost 1,100000 km, just like the he had been staying in a good world of isostasy, the spot where the Earths interior is within hydrostatic equilibrium underneath the 100-kilometer thick crust.