Citation Rankings (Highly Cited Researchers) and the list of the most cited and influential researchers cover a wide range of scientific fields, spanning 197 main and sub-disciplines, as well as the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings, offering a unique service. Additionally, the list without CERN, Statistical Data, etc., provided exclusively by “AD Scientific Index”, is part of our effort to balance the situation created by CERN and researchers with statistical data, who have an advantage over others, especially those in the social and humanities fields. There should be new regulations for multi-author and CERN papers. Citation lists also reveal many rule violations and unethical practices. See also for more specific citation analyses: Scientists Last 6 years Citation Index, Universities Total Citations Rankings 2025 and Universities Last 6 Years Citations Rankings 2025
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :1
Geochemistry
Cosmochemistry
Petrology
Geophysics
Planetary Science
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
13,936
4,662
0.335
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :2
Planetary Science
Mineralogy
Astrobiology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,807
1,805
0.643
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :3
Earth science
Planetary science
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,013
1,681
0.419
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :4
High pressure
Mineral physics
Planetary science
High-pressure mineral physics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,491
1,382
0.396
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :5
geochemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,523
1,300
0.287
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :6
Geology
Tectonics
Geochronology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
735
441
0.600
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :7
Geotechnical Engineering
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
870
388
0.446
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :8
Metamorphic petrology
Stable isotopes
Geochemistry
Bio-geochemistry
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
125
125
1.000
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :9
Geotechnical Engineering、Uncertainty Quantification
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26
26
1.000
* Last 6 Years Citation Counts Rankings
Ranking Based On Selection :10
Geochemistry
Isotopes
Petrology
Geology
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
14
14
1.000
Eizo Nakamura
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
13,936
4,662
0.335
Geochemistry
Cosmochemistry
Petrology
Geophysics
Planetary Science
Matthew Izawa
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,807
1,805
0.643
Planetary Science
Mineralogy
Astrobiology
Katsura Kobayashi
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,013
1,681
0.419
Earth science
Planetary science
Hidenori Terasaki
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,491
1,382
0.396
High pressure
Mineral physics
Planetary science
High-pressure mineral physics
Hitoshi Chiba
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
4,523
1,300
0.287
Takeshi Imayama
Okayama University of Science
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
735
441
0.600
Geology
Tectonics
Geochronology
Shin Ichi Nishimura
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
870
388
0.446
Dilan M Ratnayake
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
125
125
1.000
Metamorphic petrology
Stable isotopes
Geochemistry
Bio-geochemistry
Menglu Huang
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
26
26
1.000
Geotechnical Engineering、Uncertainty Quantification
* Last 6 Years Citation Counts Rankings
Nghiem Van Dao
Okayama University
Okayama, Japan
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
14
14
1.000
Geochemistry
Isotopes
Petrology
Geology