The fresh medal comprehends outstanding benefits in order to fundamental geophysics and for unselfish venture during the research

The fresh medal comprehends outstanding benefits in order to fundamental geophysics and for unselfish venture during the research

Keiiti Aki

Keiiti Aki was issued the 2004 William Bowie Medal at AGU Fall Conference Remembers Service, which had been stored for the , in the San francisco, California.


Kei Akis medical research has extended the brand new frontiers regarding seismology to have half a century. The guy pioneered the new digital running regarding seismic data to infer Planet design and you can functions of your earthquake supply. Most of what we learn about large earthquakes comes after out of their really works.

He was the first ever to level seismic moment (to the 1964 Niigata disturbance); Aki moment possess due to the fact changed Richter magnitude because simple measure of disturbance proportions. The guy found the essential scaling statutes to possess seismic spectra one fixed inconsistencies one of some other magnitude bills, in which he proposed real types of earthquakes to possess heterogeneous fault rupture. Which functions provided rather to help you both basic knowledge of the latest rupture process while the simple knowledge of strong surface motions.

He elucidated the fresh scattering and you may attenuation procedure that regulate the fresh new propagation regarding large-volume seismic surf, from which he derived the tricks for measuring disturbance proportions, sprinkling distributions, and you may built-in attenuation parameters. He shown, as an example, the inherent attenuation must fall off during the large wavelengths.

The guy set-up of numerous unique strategies for describing aspects of seismic waves, together with 100 % free-oscillation splitting, Gaussian beams, and you can edge built-in actions. Within the for every circumstances, he with his college students properly put this type of ways to pull the latest kind of guidance away from seismograms.

He pioneered travelling-day tomography as an easy way to review lithospheric structure beneath dense seismic arrays, publishing seminal documents nearly ten years ahead of its prevalent software to international seismology. He dependent this new seismological viewpoints towards the volcanic processes, including the relationships off seismicity and you can harmonic tremor so you can magma injections and you can eruption. The guy observed blame-zone led swells and you can put its propagation features in order to constrain the width and you can flexibility of one’s ruin zones doing faults.

While the unbelievable that abbreviated list may appear (alot more subject areas could easily be extra), they doesn’t discuss Keis real impression in the geoscience neighborhood. The guy actually blogged the book Quantitative Seismology, by far the most important textbook and you will site tips guide regarding the reputation of the field, which he coauthored having Paul Richards when you look at the 1980.

Given that an instructor and mentor, he entrained of numerous vibrant college students within his journey to understand the brand new energetic World, producing over 50 Ph.D.s which today take secret ranks from inside the seismology around the globe. Their triumph inside the at the rear of younger researchers stems partly about breadth away from their knowledge, and also out-of their better personal features-charm, humor, and you will a deep admiration on the harmony and you will poetry of your absolute world.

Keis quiet leadership in seismology has showed the subtlety and you can electricity from unselfish venture for the lookup. He has held of a lot ranking: president of Seismology Part of AGU, president of one’s Seismological Area regarding The united states, settee of your own NAS Panel to the Seismology.

However, their ideal frontrunners end are the production of the new Southern area California Earthquake Heart inside the 1991. As the beginning manager, Kei articulated an eyesight getting SCEC where the analysis from the disciplinary operating groups would be woven together with her toward a network-level ‘learn model to possess earthquake chances and you can risk inside the Southern Ca. The master-model concept triggered of several advances from inside the seismic risk research, including the incorporation regarding GPS investigation to the long-identity disturbance forecasting, and it also continues to publication the fresh new expanding SCEC cooperation.

Particular scientists loom very large in their sphere that we need individual of your William Bowie Medal, is considered the most all of our giants.


William Bowie, after who the brand new Bowie medal is called, try distressed from the looking for off seismologists in early 1920s one earthquakes may be going on at depths of nearly step 1,100 kilometres, as he was staying in a harmonious arena of isostasy, the spot where the Earths interior is in hydrostatic harmony below the 100-km thick crust.

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