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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 48 3887 3564 86 77 170 7059

George Helffrich publications per year

The chart shows the history of publications by George Helffrich between 1989 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. George Helffrich published across 38 years, from 1989 to 2026, averaging 5.1 papers a year. Output peaked at 23 publications in 2013. 5 of the 193 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1989 to 2026. Vertical axis: number of publications, 0 to 23. Peak 23 publications in 2013. 1989: 2 publications 1990: 1 publication 1991: 1 publication 1992: 1 publication 1993: 1 publication 1994: 4 publications 1995: 1 publication 1996: 3 publications 1997: 4 publications 1998: 4 publications 1999: 4 publications 2000: 1 publication 2001: 6 publications 2002: 4 publications 2003: 3 publications 2004: 2 publications 2005: 2 publications 2006: 7 publications 2007: 3 publications 2008: 6 publications 2009: 11 publications 2010: 15 publications 2011: 9 publications 2012: 10 publications 2013: 23 publications 2014: 6 publications 2015: 9 publications 2016: 4 publications 2017: 7 publications 2018: 12 publications 2019: 6 publications 2020: 2 publications 2021: 0 publications 2022: 9 publications 2023: 5 publications 2024: 0 publications 2025: 3 publications 2026: 2 publications
1989 2026

193 publications in total across all disciplines

View publications per year as a table
George Helffrich: publications per year, 1989 to 2026
Year Publications
1989 2
1990 1
1991 1
1992 1
1993 1
1994 4
1995 1
1996 3
1997 4
1998 4
1999 4
2000 1
2001 6
2002 4
2003 3
2004 2
2005 2
2006 7
2007 3
2008 6
2009 11
2010 15
2011 9
2012 10
2013 23
2014 6
2015 9
2016 4
2017 7
2018 12
2019 6
2020 2
2021 0
2022 9
2023 5
2024 0
2025 3
2026 2
Total 193
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George Helffrich 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 George Helffrich 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, 168–177 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: 170 publications — 49th percentile

49% 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
168–177 490 170
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
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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George Helffrich 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 George Helffrich 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, 48 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: 48 D-Index — 60th percentile

60% 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 48
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
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

  • 2017 - Fellow of American Geophysical Union (AGU)

Overview

George Helffrich is affiliated with the Tokyo Institute of Technology in Japan and conducts research primarily in Earth and Planetary Sciences as well as Engineering. Their work spans several interconnected subfields including Geophysics, Mechanics of Materials, Mechanical Engineering, Ocean Engineering, and Astronomy and Astrophysics.

Their research covers a range of topics such as Geological and Geochemical Analysis, High-pressure Geophysics and Materials, Reservoir Engineering and Simulation Methods, Laser-induced Spectroscopy and Plasma, Metallurgical Processes and Thermodynamics, Geological Modeling and Analysis, and Earthquake and Tectonic Studies.

Helffrich has contributed to multiple publications with notable recent papers including:

  • Thermodynamical Modeling of Liquid Fe-Si-Mg-O: Molten Magnesium Silicate Release From the Core (2020), published in Geophysical Research Letters
  • Short note about detection of a deep Mars mantle seismic discontinuity (2022), published in Zenodo (CERN European Organization for Nuclear Research)

Their frequent co-authors include Kei Hirose, Amir Khan, Domenico Giardini, Johannes Kemper, and Ryuichi Nomura, indicating active collaborations in related research areas.

Key venues of publication for Helffrich are diverse but include multiple contributions to Zenodo (CERN European Organization for Nuclear Research), as well as publications in Geophysical Research Letters, Journal of Geophysical Research Solid Earth, Geophysical Journal International, and Goldschmidt Abstracts.

Helffrich's recognition in the scientific community is marked by receiving the distinction of Fellow of the American Geophysical Union (AGU) in 2017.

Best Publications

  • Phase transition Clapeyron slopes and transition zone seismic discontinuity topography

    Craig R. Bina;George Helffrich

  • The Earth's mantle

    George R. Helffrich;George R. Helffrich;Bernard J. Wood

  • Topography of the transition zone seismic discontinuities

    George Helffrich

  • Crystallization of silicon dioxide and compositional evolution of the Earth’s core

    Kei Hirose;Guillaume Morard;Ryosuke Sinmyo;Koichio Umemoto

  • Outer-core compositional stratification from observed core wave speed profiles

    George Helffrich;Satoshi Kaneshima

  • Extended-Time Multitaper Frequency Domain Cross-Correlation Receiver-Function Estimation

    George Helffrich

  • Dipping low-velocity layer in the mid-lower mantle: evidence for geochemical heterogeneity

    Satoshi Kaneshima;George Helffrich

  • Emergence and evolution of Santa Maria Island (Azores)—The conundrum of uplifted islands revisited

    Ricardo Dos Santos Ramalho;Ricardo Dos Santos Ramalho;George Helffrich;José Madeira;Michael Cosca

  • Subduction zone thermal structure and mineralogy and their relationship to seismic wave reflections and conversions at the slab/mantle interface

    George R. Helffrich;Seth Stein;Bernard J. Wood

  • Topography of the “410” and “660” km seismic discontinuities in the Izu-Bonin Subduction Zone

    Jonathan D. Collier;George R. Helffrich

  • Precambrian crustal evolution: seismic constraints from the Canadian Shield

    D.A Thompson;ID Bastow;GR Helffrich;J-M Kendall

  • How good are routinely determined focal mechanisms? Empirical statistics based on a comparison of Harvard, USGS and ERI moment tensors

    George R. Helffrich

  • Seismological constraints on core composition from Fe-O-S liquid immiscibility.

    George Helffrich;Satoshi Kaneshima

  • Detection of lower mantle scatterers northeast of the Marianna subduction zone using short-period array data

    Satoshi Kaneshima;George Helffrich

  • Hazard potential of volcanic flank collapses raised by new megatsunami evidence

    Ricardo Dos Santos Ramalho;Ricardo Dos Santos Ramalho;Gisela Winckler;José Madeira;George Helffrich;George Helffrich

  • CALCULATION OF ELASTIC PROPERTIES FROM THERMODYNAMIC EQUATION OF STATE PRINCIPLES

    Craig R. Bina;George R. Helffrich

  • Tracers of Uplift and Subsidence in the Cape Verde Archipelago

    Ricardo S. Ramalho;GR Helffrich;Daniela N Schmidt;D Vance

  • Depleted swell root beneath the Cape Verde Islands

    Alexandra Lodge;George Helffrich

  • 410 km discontinuity sharpness and the form of the olivine α-β phase diagram: resolution of apparent seismic contradictions

    George R. Helffrich;Bernard J. Wood

  • Seismic discontinuities and subduction zones

    Jonathan D. Collier;George R. Helffrich;Bernard J. Wood

  • The Seismic Analysis Code: A Primer and User's Guide

    George Helffrich;James Wookey;Ian Bastow

  • The Seismic Analysis Code by George Helffrich

    Unknown

Frequent Co-Authors

Ian D. Bastow
Ian D. Bastow Imperial College London
James Wookey
James Wookey University of Bristol
Kei Hirose
Kei Hirose University of Tokyo
J-M Kendall
J-M Kendall University of Oxford
Christine Thomas
Christine Thomas University of Münster
David W. Eaton
David W. Eaton University of Calgary
José Madeira
José Madeira University of Lisbon
Graham Stuart
Graham Stuart University of Leeds
James O.S. Hammond
James O.S. Hammond Birkbeck, University of London
Derek Vance
Derek Vance ETH Zurich

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