World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Earth Science 91 240 129 246 42781

Keiiti Aki publications per year

The chart shows the history of publications by Keiiti Aki between 1952 and 2024, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Keiiti Aki published across 73 years, from 1952 to 2024, averaging 3.4 papers a year. Output peaked at 12 publications in 1991. 1 of the 248 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1952 to 2024. Vertical axis: number of publications, 0 to 12. Peak 12 publications in 1991. 1952: 2 publications 1953: 0 publications 1954: 2 publications 1955: 3 publications 1956: 4 publications 1957: 1 publication 1958: 1 publication 1959: 1 publication 1960: 4 publications 1961: 4 publications 1962: 3 publications 1963: 2 publications 1964: 6 publications 1965: 3 publications 1966: 3 publications 1967: 2 publications 1968: 3 publications 1969: 5 publications 1970: 4 publications 1971: 4 publications 1972: 6 publications 1973: 3 publications 1974: 4 publications 1975: 2 publications 1976: 4 publications 1977: 5 publications 1978: 6 publications 1979: 3 publications 1980: 5 publications 1981: 7 publications 1982: 8 publications 1983: 7 publications 1984: 5 publications 1985: 9 publications 1986: 7 publications 1987: 11 publications 1988: 6 publications 1989: 6 publications 1990: 7 publications 1991: 12 publications 1992: 8 publications 1993: 9 publications 1994: 6 publications 1995: 7 publications 1996: 4 publications 1997: 5 publications 1998: 2 publications 1999: 2 publications 2000: 5 publications 2001: 2 publications 2002: 3 publications 2003: 4 publications 2004: 2 publications 2005: 5 publications 2006: 0 publications 2007: 0 publications 2008: 0 publications 2009: 0 publications 2010: 1 publication 2011: 0 publications 2012: 0 publications 2013: 2 publications 2014: 0 publications 2015: 0 publications 2016: 0 publications 2017: 0 publications 2018: 0 publications 2019: 0 publications 2020: 0 publications 2021: 0 publications 2022: 0 publications 2023: 0 publications 2024: 1 publication
1952 2024

248 publications in total across all disciplines

View publications per year as a table
Keiiti Aki: publications per year, 1952 to 2024
Year Publications
1952 2
1953 0
1954 2
1955 3
1956 4
1957 1
1958 1
1959 1
1960 4
1961 4
1962 3
1963 2
1964 6
1965 3
1966 3
1967 2
1968 3
1969 5
1970 4
1971 4
1972 6
1973 3
1974 4
1975 2
1976 4
1977 5
1978 6
1979 3
1980 5
1981 7
1982 8
1983 7
1984 5
1985 9
1986 7
1987 11
1988 6
1989 6
1990 7
1991 12
1992 8
1993 9
1994 6
1995 7
1996 4
1997 5
1998 2
1999 2
2000 5
2001 2
2002 3
2003 4
2004 2
2005 5
2006 0
2007 0
2008 0
2009 0
2010 1
2011 0
2012 0
2013 2
2014 0
2015 0
2016 0
2017 0
2018 0
2019 0
2020 0
2021 0
2022 0
2023 0
2024 1
Total 248
Download as CSV

Keiiti Aki publications per year - data summary

  • Keiiti Aki, a Earth Science scholar from University of Southern California, has 248 publications recorded across 73 years, from 1952 to 2024.
  • The oldest publication on record dates to 1952 and the most recent to 2024.
  • The most productive year is 1991, with 12 publications.
  • The least productive years with any output are 1957, 1958, 1959, 2010 and others, with 1 publication each.
  • 17 of the 73 years in the span carry no publications at all (1953, 2006, 2007, 2008 and others).
  • The rate of publication averages 3.4 papers per year over the whole span, or 4.4 per year counting only the 56 years with at least one publication.
  • The last 5 years on the chart (2020-2024) hold 1 publication, <1% of the career total.
  • Split into equal eras - 1952-1976: 76 publications (3.0 per year); 1977-2001: 154 publications (6.2 per year); 2002-2024: 18 publications (0.8 per year).
  • Comparing the opening and closing eras, the overall trend of publication is declining.

Keiiti Aki publication distribution in Earth Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where Keiiti Aki sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 58 bars. Horizontal axis: publications, 38–47 to 603+. Vertical axis: number of scientists, 0 to 557. Most scientists, 557, have 128–137 publications. The last bar groups every scientist with 603 publications or more. The highlighted bar, 238–247 publications, is where this scientist sits. 38–47 publications: 5 scientists 48–57 publications: 33 scientists 58–67 publications: 94 scientists 68–77 publications: 161 scientists 78–87 publications: 278 scientists 88–97 publications: 376 scientists 98–107 publications: 404 scientists 108–117 publications: 484 scientists 118–127 publications: 540 scientists 128–137 publications: 557 scientists 138–147 publications: 491 scientists 148–157 publications: 495 scientists 158–167 publications: 458 scientists 168–177 publications: 490 scientists 178–187 publications: 414 scientists 188–197 publications: 401 scientists 198–207 publications: 333 scientists 208–217 publications: 292 scientists 218–227 publications: 290 scientists 228–237 publications: 262 scientists 238–247 publications: 243 scientists 248–257 publications: 208 scientists 258–267 publications: 185 scientists 268–277 publications: 147 scientists 278–287 publications: 128 scientists 288–297 publications: 119 scientists 298–307 publications: 120 scientists 308–317 publications: 107 scientists 318–327 publications: 93 scientists 328–337 publications: 87 scientists 338–347 publications: 64 scientists 348–357 publications: 87 scientists 358–367 publications: 60 scientists 368–377 publications: 60 scientists 378–387 publications: 34 scientists 388–397 publications: 50 scientists 398–407 publications: 44 scientists 408–417 publications: 31 scientists 418–427 publications: 39 scientists 428–437 publications: 27 scientists 438–447 publications: 36 scientists 448–457 publications: 27 scientists 458–467 publications: 29 scientists 468–477 publications: 30 scientists 478–487 publications: 19 scientists 488–497 publications: 15 scientists 498–507 publications: 18 scientists 508–517 publications: 19 scientists 518–527 publications: 16 scientists 528–537 publications: 10 scientists 538–547 publications: 11 scientists 548–557 publications: 14 scientists 558–567 publications: 11 scientists 568–577 publications: 7 scientists 578–587 publications: 14 scientists 588–597 publications: 5 scientists 598–602 publications: 4 scientists 603+ publications: 100 scientists
38–47 publications 603+

This scientist: 246 publications — 77th percentile

77% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 603 publications or more.

View publications distribution as a table
Number of Earth Science scientists by publication count, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
Publications Scientists This scientist
38–47 5
48–57 33
58–67 94
68–77 161
78–87 278
88–97 376
98–107 404
108–117 484
118–127 540
128–137 557
138–147 491
148–157 495
158–167 458
168–177 490
178–187 414
188–197 401
198–207 333
208–217 292
218–227 290
228–237 262
238–247 243 246
248–257 208
258–267 185
268–277 147
278–287 128
288–297 119
298–307 120
308–317 107
318–327 93
328–337 87
338–347 64
348–357 87
358–367 60
368–377 60
378–387 34
388–397 50
398–407 44
408–417 31
418–427 39
428–437 27
438–447 36
448–457 27
458–467 29
468–477 30
478–487 19
488–497 15
498–507 18
508–517 19
518–527 16
528–537 10
538–547 11
548–557 14
558–567 11
568–577 7
578–587 14
588–597 5
598–602 4
603+ 100
Download as CSV

Keiiti Aki publication distribution in Earth Science in 2026 - data summary

  • The chart plots the publication count of all 9,176 Earth Science scientists ranked by Research.com in 2026, grouped into 58 ranges running from 38–47 to 603+ publications.
  • Keiiti Aki, a Earth Science scholar from University of Southern California, records 246 publications - the 77th percentile of the discipline.
  • 77% of ranked Earth Science scientists score the same or lower than Keiiti Aki, and about 23% score higher.
  • The median of the discipline falls in the 168–177 publications range, and Keiiti Aki ranks above the median.
  • The most crowded range is 128–137 publications, holding 557 scientists (6% of the field).
  • 58% of the field sits in the lowest quarter of the value range (up to 178–187 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 603 publications or more, 100 scientists in all (1% of the field).

Keiiti Aki D-index placement in Earth Science in 2026

The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where Keiiti Aki sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 77 bars. Horizontal axis: D-Index, 30 to 106+. Vertical axis: number of scientists, 0 to 389. Most scientists, 389, have 36 D-Index. The last bar groups every scientist with 106 D-Index or more. The highlighted bar, 91 D-Index, is where this scientist sits. 30 D-Index: 144 scientists 31 D-Index: 215 scientists 32 D-Index: 278 scientists 33 D-Index: 379 scientists 34 D-Index: 366 scientists 35 D-Index: 372 scientists 36 D-Index: 389 scientists 37 D-Index: 366 scientists 38 D-Index: 344 scientists 39 D-Index: 349 scientists 40 D-Index: 296 scientists 41 D-Index: 289 scientists 42 D-Index: 277 scientists 43 D-Index: 279 scientists 44 D-Index: 248 scientists 45 D-Index: 257 scientists 46 D-Index: 212 scientists 47 D-Index: 202 scientists 48 D-Index: 207 scientists 49 D-Index: 204 scientists 50 D-Index: 183 scientists 51 D-Index: 178 scientists 52 D-Index: 182 scientists 53 D-Index: 178 scientists 54 D-Index: 163 scientists 55 D-Index: 117 scientists 56 D-Index: 163 scientists 57 D-Index: 120 scientists 58 D-Index: 113 scientists 59 D-Index: 136 scientists 60 D-Index: 135 scientists 61 D-Index: 96 scientists 62 D-Index: 103 scientists 63 D-Index: 83 scientists 64 D-Index: 103 scientists 65 D-Index: 83 scientists 66 D-Index: 89 scientists 67 D-Index: 92 scientists 68 D-Index: 89 scientists 69 D-Index: 78 scientists 70 D-Index: 75 scientists 71 D-Index: 53 scientists 72 D-Index: 62 scientists 73 D-Index: 54 scientists 74 D-Index: 35 scientists 75 D-Index: 52 scientists 76 D-Index: 50 scientists 77 D-Index: 32 scientists 78 D-Index: 37 scientists 79 D-Index: 20 scientists 80 D-Index: 33 scientists 81 D-Index: 36 scientists 82 D-Index: 34 scientists 83 D-Index: 34 scientists 84 D-Index: 24 scientists 85 D-Index: 19 scientists 86 D-Index: 18 scientists 87 D-Index: 26 scientists 88 D-Index: 30 scientists 89 D-Index: 17 scientists 90 D-Index: 21 scientists 91 D-Index: 19 scientists 92 D-Index: 15 scientists 93 D-Index: 14 scientists 94 D-Index: 20 scientists 95 D-Index: 9 scientists 96 D-Index: 10 scientists 97 D-Index: 15 scientists 98 D-Index: 13 scientists 99 D-Index: 3 scientists 100 D-Index: 13 scientists 101 D-Index: 3 scientists 102 D-Index: 9 scientists 103 D-Index: 4 scientists 104 D-Index: 6 scientists 105 D-Index: 6 scientists 106+ D-Index: 98 scientists
30 D-Index 106+

This scientist: 91 D-Index — 97th percentile

97% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 106 D-Index or more.

View D-Index distribution as a table
Number of Earth Science scientists by D-index, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
D-Index Scientists This scientist
30 144
31 215
32 278
33 379
34 366
35 372
36 389
37 366
38 344
39 349
40 296
41 289
42 277
43 279
44 248
45 257
46 212
47 202
48 207
49 204
50 183
51 178
52 182
53 178
54 163
55 117
56 163
57 120
58 113
59 136
60 135
61 96
62 103
63 83
64 103
65 83
66 89
67 92
68 89
69 78
70 75
71 53
72 62
73 54
74 35
75 52
76 50
77 32
78 37
79 20
80 33
81 36
82 34
83 34
84 24
85 19
86 18
87 26
88 30
89 17
90 21
91 19 91
92 15
93 14
94 20
95 9
96 10
97 15
98 13
99 3
100 13
101 3
102 9
103 4
104 6
105 6
106+ 98
Download as CSV

Keiiti Aki D-index placement in Earth Science in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 9,176 Earth Science scientists ranked by Research.com in 2026, grouped into 77 ranges running from 30 to 106+ D-Index.
  • Keiiti Aki, a Earth Science scholar from University of Southern California, records 91 D-Index - the 97th percentile of the discipline.
  • 97% of ranked Earth Science scientists score the same or lower than Keiiti Aki, and about 3% score higher.
  • The median of the discipline falls in the 44 D-Index range, and Keiiti Aki ranks above the median.
  • The most crowded range is 36 D-Index, holding 389 scientists (4% of the field).
  • 62% of the field sits in the lowest quarter of the value range (up to 49 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 106 D-Index or more, 98 scientists in all (1% of the field).

Overview

Keiiti Aki was affiliated with the University of Southern California in the United States. Throughout their career, they contributed to the academic and scientific community primarily through research and scholarship associated with this institution.

Although there is limited detailed information available on their specific research topics, publication records, frequent collaboration partners, or precise fields of study, Keiiti Aki's work would have been situated within the academic environment of their affiliation, which is notable for research activities in various scientific domains.

The absence of listed recent papers, co-authors, or publication venues prevents further detail on the specific impact or focus areas in their research. Similarly, no record is provided concerning book publications or awards, which suggests either limited documentation or focus on non-book-based scholarly contributions.

Given that Keiiti Aki is deceased, reflections on their career and scholarly contributions consider their work as part of the historical academic record rather than ongoing research activities.

Best Publications

  • Quantitative seismology : theory and methods

    Keiiti Aki;Paul G. Richards

  • Origin of coda waves: Source, attenuation, and scattering effects

    Keiiti Aki;Bernard Chouet

  • Scaling law of seismic spectrum

    Keiiti Aki

  • Space and Time Spectra of Stationary Stochastic Waves, with Special Reference to Microtremors

    Keiiti Aki

  • Analysis of the seismic coda of local earthquakes as scattered waves

    Keiiti Aki

  • Determination of the three‐dimensional seismic structure of the lithosphere

    Keiiti Aki;Anders Christoffersson;Eystein S. Husebye

  • Determination of three‐dimensional velocity anomalies under a seismic array using first P arrival times from local earthquakes: 1. A homogeneous initial model

    Keiiti Aki;W. H. K. Lee

  • Quantitative Seismology, 2nd Ed.

    Keiiti Aki;Paul G. Richards

  • Attenuation of shear-waves in the lithosphere for frequencies from 0.05 to 25 Hz

    Keiiti Aki

  • Characterization of barriers on an earthquake fault

    Keiiti Aki

  • Fault plane with barriers: A versatile earthquake model

    Shamita Das;Keiiti Aki

  • Discrete wave-number representation of seismic-source wave fields

    Michel Bouchon;Keiiti Aki

  • A Probabilistic Synthesis of Precursory Phenomena

    Keiiti Aki

  • A specific barrier model for the quantitative description of inhomogeneous faulting and the prediction of strong ground motion. Part II. Applications of the model

    Apostolos S. Papageorgiou;Keiiti Aki

  • Scattering and attenuation of shear waves in the lithosphere

    Keiiti Aki

  • Asperities, barriers, characteristic earthquakes and strong motion prediction

    Keiiti Aki

  • Surface motion of a layered medium having an irregular interface due to incident plane SH waves

    Keiiti Aki;Kenneth L. Larner

  • Fractal geometry in the San Andreas Fault System

    Paul G. Okubo;Keiiti Aki

  • A numerical study of two-dimensional spontaneous rupture propagation

    Shamita Das;Keiiti Aki

  • Scattering characteristics of elastic waves by an elastic heterogeneity

    R. Wu;Keiiti Aki

Frequent Co-Authors

Bernard A. Chouet
Bernard A. Chouet United States Geological Survey
Valérie Ferrazzini
Valérie Ferrazzini Institut de Physique du Globe de Paris
Yuehua Zeng
Yuehua Zeng United States Geological Survey
Ru-Shan Wu
Ru-Shan Wu University of California, Santa Cruz
John E. Vidale
John E. Vidale University of Southern California
Michel Bouchon
Michel Bouchon Centre national de la recherche scientifique, CNRS
Shamita Das
Shamita Das University of Oxford
Xiaofei Chen
Xiaofei Chen University of Science and Technology of China
Fei Xu
Fei Xu Nanjing University

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

Exploring Earth Science in the USA opens doors to diverse career paths, many of which benefit from complementary skills gained through other degree programs. For instance, understanding data management and research techniques from a is a library science degree worth it perspective can enhance scientific research capabilities.

Visual communication also plays a vital role in the presentation of Earth Science data. Pursuing a bachelors in photography online can provide essential skills for careers involving geological mapping, environmental monitoring, or science communication.

Veterans interested in Earth Science can find tailored educational opportunities through military friendly online photography degree programs, which offer flexible options that respect their unique backgrounds and commitments.

Lastly, global environmental challenges require multilingual communication, making a spanish degree online a practical complement. This skill can broaden career possibilities in international research, disaster response, and community outreach.

Best Scientists Citing Keiiti Aki

Recently Published Articles