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Earth Science
USA
2026

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 95 185 157 91 76 414 30281

Richard J. Walker publications per year

The chart shows the history of publications by Richard J. Walker between 1982 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Richard J. Walker published across 44 years, from 1982 to 2025, averaging 10.5 papers a year. Output peaked at 33 publications in 2016. 18 of the 460 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 1982 to 2025. Vertical axis: number of publications, 0 to 33. Peak 33 publications in 2016. 1982: 1 publication 1983: 2 publications 1984: 3 publications 1985: 0 publications 1986: 3 publications 1987: 3 publications 1988: 5 publications 1989: 8 publications 1990: 1 publication 1991: 2 publications 1992: 3 publications 1993: 2 publications 1994: 3 publications 1995: 5 publications 1996: 7 publications 1997: 3 publications 1998: 6 publications 1999: 5 publications 2000: 8 publications 2001: 11 publications 2002: 8 publications 2003: 12 publications 2004: 13 publications 2005: 18 publications 2006: 18 publications 2007: 10 publications 2008: 16 publications 2009: 27 publications 2010: 17 publications 2011: 16 publications 2012: 20 publications 2013: 13 publications 2014: 16 publications 2015: 15 publications 2016: 33 publications 2017: 21 publications 2018: 22 publications 2019: 16 publications 2020: 14 publications 2021: 10 publications 2022: 9 publications 2023: 17 publications 2024: 13 publications 2025: 5 publications
1982 2025

460 publications in total across all disciplines

View publications per year as a table
Richard J. Walker: publications per year, 1982 to 2025
Year Publications
1982 1
1983 2
1984 3
1985 0
1986 3
1987 3
1988 5
1989 8
1990 1
1991 2
1992 3
1993 2
1994 3
1995 5
1996 7
1997 3
1998 6
1999 5
2000 8
2001 11
2002 8
2003 12
2004 13
2005 18
2006 18
2007 10
2008 16
2009 27
2010 17
2011 16
2012 20
2013 13
2014 16
2015 15
2016 33
2017 21
2018 22
2019 16
2020 14
2021 10
2022 9
2023 17
2024 13
2025 5
Total 460
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Richard J. Walker 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 Richard J. Walker 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, 408–417 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: 414 publications — 95th percentile

95% 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
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 31 414
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
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Richard J. Walker 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 Richard J. Walker 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, 95 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: 95 D-Index — 98th percentile

98% 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
92 15
93 14
94 20
95 9 95
96 10
97 15
98 13
99 3
100 13
101 3
102 9
103 4
104 6
105 6
106+ 98
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Research.com Recognitions

  • 2026 - Research.com Earth Science in United States Leader Award
  • 2025 - Research.com Earth Science in United States Leader Award
  • 2009 - Fellow of American Geophysical Union (AGU)

Overview

Richard J. Walker is affiliated with the University of Maryland, College Park in the United States. Their research spans multiple disciplines with a primary focus on Physics and Astronomy as well as Earth and Planetary Sciences.

Their work prominently features in subfields such as Astronomy and Astrophysics, Geophysics, Ecology, Atmospheric Science, and Geochemistry and Petrology. The core topics they investigate include Astro and Planetary Science, Planetary Science and Exploration, Geological and Geochemical Analysis, Isotope Analysis in Ecology, High-pressure Geophysics and Materials, earthquake and tectonic studies, and Geology and Paleoclimatology Research.

They have contributed to numerous publications in a variety of scientific venues. The most frequent publication venues include:

  • Geochimica et Cosmochimica Acta
  • Meteoritics and Planetary Science
  • Science Advances
  • Chemical Geology
  • The Astrophysical Journal Letters

Recent published papers featuring Richard J. Walker include:

  • Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites (2022, Science)
  • Ryugu's nucleosynthetic heritage from the outskirts of the Solar System (2022, Science Advances)
  • Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2 (2022, Science Advances)
  • Contribution of Ryugu-like material to Earth's volatile inventory by Cu and Zn isotopic analysis (2022, Nature Astronomy)
  • Ultra-depleted 2.05 Ga komatiites of Finnish Lapland: Products of grainy late accretion or core-mantle interaction? (2020, Chemical Geology)

Richard J. Walker has collaborated extensively with frequent co-authors including:

  • Richard W. Carlson
  • K. Nagashima
  • Tetsuya Yokoyama
  • Izumi Nakai
  • Yoshinari Abe

In recognition of their contributions to geophysical sciences, Richard J. Walker was honored as a Fellow of the American Geophysical Union (AGU) in 2009.

Best Publications

  • Re-Os Ages of Group IIA, IIIA, IVA, and IVB Iron Meteorites

    Michael I. Smoliar;Richard J. Walker;John W. Morgan

  • Carius tube digestion for low-blank rhenium-osmium analysis

    Steven B. Shirey;Richard J. Walker

  • THE Re-Os ISOTOPE SYSTEM IN COSMOCHEMISTRY AND HIGH-TEMPERATURE GEOCHEMISTRY

    Steven B. Shirey;Richard J. Walker

  • Os, Sr, Nd, and Pb isotope systematics of southern African peridotite xenoliths: Implications for the chemical evolution of subcontinental mantle

    R.J Walker;R.W Carlson;S.B Shirey;Boyd F.R

  • Osmium isotopic compositions of mantle xenoliths: A global perspective

    Thomas Meisel;Richard J Walker;Anthony J Irving;Jean-Pierre Lorand

  • Highly siderophile element composition of the Earth’s primitive upper mantle: Constraints from new data on peridotite massifs and xenoliths

    H. Becker;H. Becker;M.F. Horan;R.J. Walker;S. Gao

  • Destruction of the North China Craton in the Mesozoic

    Fu-Yuan Wu;Jin-Hui Yang;Yi-Gang Xu;Simon A. Wilde

  • Recycling deep cratonic lithosphere and generation of intraplate magmatism in the North China Craton

    Shan Gao;Shan Gao;Roberta L. Rudnick;Wen-Liang Xu;Hong-Lin Yuan

  • Osmium isotopic constraints on the age of lithospheric mantle beneath northeastern China

    Fu-yuan Wu;Richard J. Walker;Xiang-wen Ren;De-you Sun

  • The osmium isotopic composition of the Earth's primitive upper mantle

    T. Meisel;T. Meisel;R. J. Walker;J. W. Morgan

  • The chemical-temporal evolution of lithospheric mantle underlying the North China Craton

    Fu Yuan Wu;Richard J. Walker;Yue Heng Yang;Hong Lin Yuan

  • Highly siderophile elements in the Earth, Moon and Mars: Update and implications for planetary accretion and differentiation

    Richard J. Walker

  • Highly siderophile elements in chondrites

    M.F. Horan;R.J. Walker;J.W. Morgan;J.N. Grossman

  • 190Pt–186Os and 187Re–187Os systematics of abyssal peridotites

    Alan D Brandon;Alan D Brandon;Jonathan E Snow;Richard J Walker;John W Morgan;John W Morgan

  • The absence of lithium isotope fractionation during basalt differentiation: new measurements by multicollector sector ICP-MS

    Paul B. Tomascak;Fouad Tera;Rosalind T. Helz;Richard J. Walker

  • Coupled 186Os and 187Os evidence for core-mantle interaction

    A. D. Brandon;Richard Walker;John W. Morgan;Marc D. Norman

  • Comparative 187Re-187Os systematics of chondrites: Implications regarding early solar system processes

    R.J Walker;M.F Horan;J.W Morgan;H Becker

  • Temporal Evolution of the Lithospheric Mantle beneath the Eastern North China Craton

    Zhu-Yin Chu;Fu-Yuan Wu;Richard J. Walker;Roberta L. Rudnick

  • The osmium isotopic composition of convecting upper mantle deduced from ophiolite chromites

    Richard J. Walker;Hazel Margaret Prichard;Akira Ishiwatari;Marcio Pimentel

  • RE-OS ISOTOPIC EVIDENCE FOR AN ENRICHED-MANTLE SOURCE FOR THE NORIL'SK-TYPE, ORE-BEARING INTRUSIONS, SIBERIA

    R.J Walker;J.W Morgan;M.F Horan;G.K Czamanske

  • 186Os–187Os systematics of Hawaiian picrites

    Alan D. Brandon;Marc D. Norman;Richard J. Walker;John W. Morgan;John W. Morgan

Frequent Co-Authors

James M.D. Day
James M.D. Day University of California, San Diego
Mary F. Horan
Mary F. Horan Carnegie Institution for Science
Igor S. Puchtel
Igor S. Puchtel University of Maryland, College Park
John W. Morgan
John W. Morgan University of Maryland, College Park
William F. McDonough
William F. McDonough University of Maryland, College Park
Alan D. Brandon
Alan D. Brandon University of Houston
Richard W. Carlson
Richard W. Carlson Carnegie Institution for Science
Timothy J. McCoy
Timothy J. McCoy National Museum of Natural History
Roberta L. Rudnick
Roberta L. Rudnick University of California, Santa Barbara
Harry Becker
Harry Becker Freie Universität Berlin

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