The latest medal knows a great efforts so you’re able to practical geophysics as well as unselfish cooperation inside the search

The latest medal knows a great efforts so you’re able to practical geophysics as well as unselfish cooperation inside the search

Keiiti Aki

Keiiti Aki is issued the new 2004 William Bowie Medal at AGU Slide Fulfilling Celebrates Service, that was stored into , from inside the Bay area, Ca.


Kei Akis scientific studies have lengthened the new frontiers regarding seismology to have half a century. He pioneered the newest electronic control regarding seismic studies so you can infer Environment structure and you may services of quake provider. Much of that which we find out about higher earthquakes comes after out-of his functions.

He had been the first to ever measure seismic moment (into 1964 Niigata earthquake); Aki minute have because replaced Richter magnitude since important level away from quake dimensions. He found the basic scaling rules to own seismic spectra you to solved inconsistencies certainly more magnitude balances, and then he suggested actual different types of earthquakes to possess heterogeneous fault rupture. That it performs discussed somewhat so you can the basic understanding of this new rupture techniques as well as the fundamental knowledge of good crushed actions.

The guy elucidated the sprinkling and you may attenuation techniques you to definitely control this new propagation regarding large-frequency seismic surf, where he derived new suggestions for calculating disturbance proportions, sprinkling distributions, and you will built-in attenuation variables. He exhibited, for-instance, your intrinsic attenuation need certainly to decrease in the high wavelengths.

He arranged of numerous unique tips for describing aspects of seismic swells, along with totally free-oscillation busting, Gaussian beams, and you will boundary integral measures. Inside for every single situation, the guy and his youngsters efficiently utilized these types of solutions to pull the fresh brand of recommendations out-of seismograms.

He developed traveling-go out tomography as an easy way to learn lithospheric design below thicker seismic arrays, posting seminal documents nearly a decade ahead of its common software to help you worldwide seismology. He founded the seismological viewpoints toward eruptive techniques, like the relationships away from seismicity and harmonic tremor to magma injections and you can eruption. He identified fault-zone directed swells and you may put their propagation properties so you can constrain new width and you may flexibility of ruin areas doing problems.

Just like the epic since this abbreviated checklist may appear (far more subject areas could easily be additional), it does not communicate Keis true impact inside the geoscience area. The guy actually penned the book Decimal Seismology, probably the most influential textbook and you may resource guide on history of industry, he coauthored which have Paul Richards when you look at the 1980.

As an instructor and you can advisor, he entrained of several brilliant pupils inside the trip to learn the newest effective Planet, promoting more than fifty Ph.D.s who today inhabit trick ranking in seismology worldwide. His profits inside at the rear of more youthful boffins stems to some extent throughout the breadth from his knowledge, and also off his better personal qualities-attraction, laughter, and a deep admiration into the harmony and you will poetry of your natural industry.

Keis silent leadership in the seismology has actually displayed new subtlety and you can strength of unselfish venture into the research. He has stored of numerous positions: president of one’s Seismology Section of AGU, chairman of your Seismological Society off The usa, couch of your NAS Committee on Seismology.

But their most readily useful leadership completion was the manufacture of the fresh South Ca Disturbance Heart in the 1991. As the founding director, Kei articulated a plans to have SCEC where the evaluation by the disciplinary working communities could be woven along with her to the a network-peak ‘grasp design getting disturbance hazard and you can chance when you look at the Southern area California. The master-model layout resulted in of a lot improves during the seismic chances study, including the incorporation off GPS analysis on the much time-title disturbance anticipating, therefore continues to book this new expanding SCEC venture.

Specific boffins loom therefore high in their industries we need certainly to receiver of your William Bowie Medal, is one of all of our monsters.


William Bowie, after just who this new Bowie medal is called, is disappointed from the shopping for regarding seismologists in early 1920s one earthquakes are occurring from the deepness away from almost 1,100 km, once the he was residing in a harmonious realm of isostasy, the spot where the Earths interior is during hydrostatic harmony beneath the 100-kilometres heavy crust.

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