World Scientist and University Rankings 2025
Japan Engineering & Technology / Earth Sciences 580 Scientists Subject Rankings - 2025
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 197 sub-branches at global, national, and regional levels. These analyses are based on indicators such as the H-index, i10-index, and citation count, including their values from the last 6 years. As of Jan 30, 2025, the rankings are determined according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in their Beta phase. This is due to the exclusion of (873.690) scientists categorized under ‘Others’, whose profiles have yet to be determined, edited, or classified. As updates are made to these fields, the rankings will be adjusted accordingly. Note: Please keep this in mind while reviewing the rankings. For further details, explore our [University Subject Rankings].
* Total H IndexRankings
Ranking Based On Selection: 1
Geochemistry
Atmospheric Chemistry
Aerosol Chemistry
Geoscience
Metrics
H-Index
i10 Index
Citation Counts
102
473
38,095
* Total H IndexRankings
Ranking Based On Selection: 2
Seismology
Geophysics
Geoscience
Metrics
H-Index
i10 Index
Citation Counts
94
365
34,400
* Total H IndexRankings
Ranking Based On Selection: 3
Geobiology
Microbiology
Astrobiology
Origin of Life
Environmental Microbiology
Metrics
H-Index
i10 Index
Citation Counts
91
301
28,019
* Total H IndexRankings
Ranking Based On Selection: 4
Quaternary geology
marine geology
sedimentology
river deltas
Anthropocene
Metrics
H-Index
i10 Index
Citation Counts
85
227
29,508
* Total H IndexRankings
Ranking Based On Selection: 5
Earth and planetary science
Metrics
H-Index
i10 Index
Citation Counts
81
346
21,557
* Total H IndexRankings
Ranking Based On Selection: 6
atmospheric
aerosol
climate change
Metrics
H-Index
i10 Index
Citation Counts
80
264
46,181
* Total H IndexRankings
Ranking Based On Selection: 7
High-pressure mineral physics
Deep Earth science
Metrics
H-Index
i10 Index
Citation Counts
77
184
19,906
* Total H IndexRankings
Ranking Based On Selection: 8
Seismology
Tectonophysics
Metrics
H-Index
i10 Index
Citation Counts
74
198
18,620
* Total H IndexRankings
Ranking Based On Selection: 9
astrophysics
Metrics
H-Index
i10 Index
Citation Counts
74
200
19,226
* Total H IndexRankings
Ranking Based On Selection: 10
earthquake
tsunami
Metrics
H-Index
i10 Index
Citation Counts
72
249
20,676
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* Total H IndexRankings
Ranking Based On Selection: 11
Isotope Biogeochemistry
Environmental Chemistry
Isotopomer
Isotopologue
Metrics
H-Index
i10 Index
Citation Counts
70
288
17,272
* Total H IndexRankings
Ranking Based On Selection: 12
earth science
Metrics
H-Index
i10 Index
Citation Counts
69
177
19,978
* Total H IndexRankings
Ranking Based On Selection: 13
Geochemistry
Cosmochemistry
Petrology
Geophysics
Planetary Science
Metrics
H-Index
i10 Index
Citation Counts
69
198
14,368
* Total H IndexRankings
Ranking Based On Selection: 14
Geochemistry
Metrics
H-Index
i10 Index
Citation Counts
68
268
17,236
* Total H IndexRankings
Ranking Based On Selection: 15
Geochemistry
Cosmochemistry
Metrics
H-Index
i10 Index
Citation Counts
65
250
16,502
* Total H IndexRankings
Ranking Based On Selection: 16
radiochemistry
geochemistry
Metrics
H-Index
i10 Index
Citation Counts
57
306
13,073
* Total H IndexRankings
Ranking Based On Selection: 17
Geology
Paleoceanography
Deep-sea Drilling
Anthropocene
Metrics
H-Index
i10 Index
Citation Counts
57
137
11,135
* Total H IndexRankings
Ranking Based On Selection: 18
Geotechnical Earthquake Engineering
Geotechnical Engineering
Metrics
H-Index
i10 Index
Citation Counts
56
139
17,742
* Total H IndexRankings
Ranking Based On Selection: 19
seafloor hydrothermal system
geochemistry
Metrics
H-Index
i10 Index
Citation Counts
55
152
9,863
* Total H IndexRankings
Ranking Based On Selection: 20
Self-assembly
fullerene nanoarchitectonics
Nanoporous carbons
Metrics
H-Index
i10 Index
Citation Counts
54
187
10,174
* Total H IndexRankings
Ranking Based On Selection: 21
Environmental Microbiology
Metrics
H-Index
i10 Index
Citation Counts
53
127
11,163
* Total H IndexRankings
Ranking Based On Selection: 22
Geochemistry
Ocean science
Environmental radioactivity
Metrics
H-Index
i10 Index
Citation Counts
53
146
9,189
* Total H IndexRankings
Ranking Based On Selection: 23
Seismology
Metrics
H-Index
i10 Index
Citation Counts
52
132
10,902
* Total H IndexRankings
Ranking Based On Selection: 24
High Pressure Earth Science
Metrics
H-Index
i10 Index
Citation Counts
51
139
9,024
* Total H IndexRankings
Ranking Based On Selection: 25
tsunami geology
Metrics
H-Index
i10 Index
Citation Counts
50
155
11,232
Kimitaka Kawamura
Chubu University
Kasugai, Japan
Metrics
H-Index
i10-Index
Citation Counts
102
473
38,095
Geochemistry
Atmospheric Chemistry
Aerosol Chemistry
Geoscience
Seismology
Geophysics
Geoscience
Ken Takai
Metrics
H-Index
i10-Index
Citation Counts
91
301
28,019
Geobiology
Microbiology
Astrobiology
Origin of Life
Environmental Microbiology
Yoshiki Saito 斎藤文紀 齋藤文紀 Yoshi|斎藤文紀, 齋藤文紀, Yoshi Saito
Shimane University
Matsue, Japan
Metrics
H-Index
i10-Index
Citation Counts
85
227
29,508
Quaternary geology
marine geology
sedimentology
river deltas
Anthropocene
Teruyuki Nakajima
University of Tokyo
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
80
264
46,181
atmospheric
aerosol
climate change
Kei Hirose
Earth-Life Science Institute
Saitama, Japan
Metrics
H-Index
i10-Index
Citation Counts
77
184
19,906
High-pressure mineral physics
Deep Earth science
Akira Hasegawa
Tohoku University
Sendai, Japan
Metrics
H-Index
i10-Index
Citation Counts
74
198
18,620
Junichiro Makino
Kobe University
Kobe, Japan
Metrics
H-Index
i10-Index
Citation Counts
74
200
19,226
Kenji Satake
University of Tokyo
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
72
249
20,676
Enroll all your faculty members with discounted institutional membership to showcase your institution's academic strength to the world in the best way possible – join now and achieve results fast!
Naohiro Yoshida
Metrics
H-Index
i10-Index
Citation Counts
70
288
17,272
Isotope Biogeochemistry
Environmental Chemistry
Isotopomer
Isotopologue
Yoshiyuki Tatsumi
Kobe University
Kobe, Japan
Metrics
H-Index
i10-Index
Citation Counts
69
177
19,978
Eizo Nakamura
Okayama University
Okayama, Japan
Metrics
H-Index
i10-Index
Citation Counts
69
198
14,368
Geochemistry
Cosmochemistry
Petrology
Geophysics
Planetary Science
Hisayoshi Yurimoto
Hokkaido University
Sapporo, Japan
Metrics
H-Index
i10-Index
Citation Counts
65
250
16,502
Masayoshi Yamamoto
Kanazawa University
Kanazawa, Japan
Metrics
H-Index
i10-Index
Citation Counts
57
306
13,073
Taira, Asahiko
Metrics
H-Index
i10-Index
Citation Counts
57
137
11,135
Geology
Paleoceanography
Deep-sea Drilling
Anthropocene
Kohji Tokimatsu
Metrics
H-Index
i10-Index
Citation Counts
56
139
17,742
Geotechnical Earthquake Engineering
Geotechnical Engineering
Jun Ichiro Ishibashi
Kobe University
Kobe, Japan
Metrics
H-Index
i10-Index
Citation Counts
55
152
9,863
seafloor hydrothermal system
geochemistry
Lok Kumar Shrestha
Metrics
H-Index
i10-Index
Citation Counts
54
187
10,174
Self-assembly
fullerene nanoarchitectonics
Nanoporous carbons
Takuro Nunoura
Metrics
H-Index
i10-Index
Citation Counts
53
127
11,163
Michio Aoyama
University of Tsukuba
Tsukuba, Japan
Metrics
H-Index
i10-Index
Citation Counts
53
146
9,189
Geochemistry
Ocean science
Environmental radioactivity
Toru Inoue
Hiroshima University
Higashihiroshima, Japan
Metrics
H-Index
i10-Index
Citation Counts
51
139
9,024
Kazuhisa Goto
Tohoku University
Sendai, Japan
Metrics
H-Index
i10-Index
Citation Counts
50
155
11,232