The brand new medal knows an excellent benefits in order to practical geophysics as well as for unselfish venture within the research

The brand new medal knows an excellent benefits in order to practical geophysics as well as for unselfish venture within the research

Keiiti Aki

Keiiti Aki try approved the new 2004 William Bowie Medal within AGU Fall Appointment Remembers Ceremony, which was stored toward , for the San francisco, Ca.


Kei Akis scientific studies have expanded the frontiers out-of seismology getting half a century. He pioneered the brand new digital processing from seismic investigation so you’re able to infer Environment structure and you may characteristics of your own disturbance provider. Most of everything we understand higher earthquakes uses from their performs.

He had been the first to measure seismic minute (on the 1964 Niigata earthquake); Aki time has while the changed Richter magnitude since standard scale off quake dimensions. He found the basic scaling regulations having seismic spectra that resolved inconsistencies certainly one of more magnitude bills, in which he suggested bodily varieties of earthquakes for heterogeneous fault rupture. It work contributed significantly so you’re able to the basic knowledge of the brand new rupture processes plus the important understanding of solid floor motions.

The guy elucidated the brand new scattering babel and you may attenuation processes you to definitely control this new propagation off high-regularity seismic swells, where the guy derived new techniques for calculating disturbance size, scattering withdrawals, and built-in attenuation variables. He showed, such as, your built-in attenuation need certainly to drop off on large wavelengths.

He establish many unique approaches for discussing regions of seismic swells, along with 100 % free-oscillation busting, Gaussian beams, and you can border inbuilt actions. Into the for every instance, the guy and his students effectively made use of such ways to extract brand new kind of advice off seismograms.

He developed travel-time tomography as a means to analyze lithospheric build below thick seismic arrays, publishing seminal paperwork nearly 10 years ahead of its widespread software so you’re able to all over the world seismology. The guy situated new seismological perspectives into the eruptive process, including the relationships away from seismicity and harmonic tremor so you’re able to magma shot and emergence. The guy imagined blame-region directed surf and utilized its propagation services so you’re able to constrain the width and elasticity of one’s ruin zones around problems.

Once the epic since this abbreviated checklist might sound (even more topics can easily be additional), it does not express Keis real perception when you look at the geoscience people. The guy virtually wrote the publication Decimal Seismology, by far the most important book and you will source guidelines on reputation for the field, he coauthored having Paul Richards from inside the 1980.

Since an instructor and you may mentor, he entrained of numerous brilliant people within his quest knowing the new active World, generating more 50 Ph.D.s whom today occupy secret ranks in seismology internationally. Their victory within the guiding young researchers stems in part on breadth out of their understanding, plus regarding their remarkable individual services-appeal, wit, and you may a-deep regard into the harmony and poetry of your own sheer industry.

Keis hushed leaders within the seismology has actually presented the subtlety and you can strength from unselfish collaboration into the lookup. He’s got kept of several ranks: president of Seismology Section of AGU, president of the Seismological People out of The united states, couch of NAS Committee toward Seismology.

But his most readily useful leadership completion are the manufacture of new Southern Ca Disturbance Cardiovascular system in 1991. As its founding director, Kei articulated an eyesight to possess SCEC in which the evaluation of the disciplinary functioning organizations could well be woven with her with the a network-height ‘master design having disturbance issues and you will exposure into the South California. The owner-design style lead to of a lot advances in the seismic hazard study, like the incorporation out of GPS data toward long-identity disturbance anticipating, and it will continue to book the fresh growing SCEC collaboration.

Some researchers loom thus highest in their areas that people need to receiver of your William Bowie Medal, is one of the creatures.


William Bowie, immediately after exactly who this new Bowie medal is named, was disturb of the finding from seismologists during the early 1920s that earthquakes could be occurring at deepness off almost step 1,000 kilometer, because he was staying in a good field of isostasy, the spot where the Earths indoor is in hydrostatic equilibrium underneath the 100-kilometer heavy crust.