The brand new medal knows an excellent efforts in order to practical geophysics and for unselfish cooperation within the lookup

The brand new medal knows an excellent efforts in order to practical geophysics and for unselfish cooperation within the lookup

Keiiti Aki

Keiiti Aki try provided this new 2004 William Bowie Medal from the AGU Fall Fulfilling Celebrates Service, which had been kept into the , in the San francisco bay area, Ca.


Kei Akis medical research has longer the latest frontiers off seismology having half a century. He developed new electronic handling of seismic study in order to infer Planet structure and you will characteristics of disturbance origin. A lot of that which we realize about higher earthquakes comes after out of their really works.

He was the first ever to measure seismic second (for the 1964 Niigata quake); Aki minute has actually since changed Richter magnitude as the simple scale of earthquake size. He receive the basic scaling laws and regulations for seismic spectra one solved inconsistencies certainly other magnitude balances, and he recommended actual models of earthquakes for heterogeneous blame rupture. So it performs contributed significantly to the very first understanding of the newest rupture procedure in addition to basic comprehension of good crushed moves.

The guy elucidated brand new scattering and you can attenuation processes you to definitely regulate the latest propagation away from higher-regularity seismic waves, where he derived the fresh tricks for measuring quake proportions, sprinkling withdrawals, and you will intrinsic attenuation variables. He displayed, for instance, your intrinsic attenuation need to drop-off within highest frequencies.

He created of numerous novel methods for explaining aspects of seismic swells, together with 100 % free-oscillation busting, Gaussian beams, and you will line built-in measures. For the for every single instance, he along with his children efficiently used these methods to extract the fresh version of recommendations out of seismograms.

The guy developed travel-big date tomography as a means to analyze lithospheric structure underneath thick seismic arrays, posting seminal records nearly a decade prior to its common app so you’re able to around the globe seismology. He built this new seismological viewpoints to the eruptive processes, like the matchmaking out of seismicity and you may harmonic tremor in order to magma shot and you can eruption. He understood blame-zone led waves and you will utilized its propagation attributes to constrain this new depth and you can elasticity of one’s damage zones to defects.

Due to the fact impressive since this abbreviated list might sound (alot more subjects can easily be added), it fails to communicate Keis correct effect into the geoscience area. The guy literally published the publication Decimal Seismology, the most influential book and you may resource guide from the reputation of industry, which he coauthored which have Paul Richards during the 1980.

Due to the fact an instructor and you will coach, the guy entrained of many vibrant youngsters in the journey to know the latest active Environment, creating more than 50 Ph.D.s which today inhabit key positions for the seismology all over the world. Their victory when you look at the guiding more youthful experts stems partly from the depth regarding his facts, plus away from their superior individual qualities-charm, laughs, and you will a deep value to your balance and poetry of sheer globe.

Keis silent leadership into the seismology provides presented the fresh new subtlety and you can energy out of unselfish venture in research. They have kept of several ranking: president of the Seismology Part of AGU, chairman of the Seismological Community away from The united states, sofa of the NAS Panel with the Seismology.

But their ideal frontrunners completion are producing the fresh new Southern Ca Disturbance Heart when you look at the 1991. As the beginning manager, Kei articulated a vision to own SCEC where evaluation by disciplinary functioning communities was woven along with her with the a system-peak ‘grasp design to possess disturbance possibility and you will risk in the Southern Ca. The proprietor-model design resulted in of a lot enhances for the seismic risk studies, such as the incorporation away from GPS data into the long-name quake anticipating, and it will continue to book the brand new increasing SCEC collaboration.

Some scientists loom thus high in their areas that people need to person of your William Bowie Medal, is one of our monsters.


William Bowie, shortly after exactly who the latest Bowie medal is named, are troubled from the wanting of seismologists in the early 1920s one earthquakes is happening at depths out-of nearly 1,one hundred thousand km, because the he had been located in a harmonious arena of isostasy, where Earths indoor is actually hydrostatic equilibrium underneath the 100-km dense crust.

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