Each institution’s position in the ranking is determined by aggregating the D-indexes (Discipline H-index) of all affiliated scholars whose principal publication area lies in Earth Science. Crucially, the D-index considers only publications and citation data directly relevant to the examined discipline, ensuring an accurate representation of Earth Science-specific research productivity and impact.
Scope of Research Analysed
To ensure comprehensive coverage, profiles of 279,971 scientists identified across multiple bibliometric data sources were initially reviewed, with a focused analysis on 31,170 scientists working specifically in the area of Earth Science. A qualifying D-index threshold of 30 was enforced for individual scientists, accompanied by the requirement that a majority of each candidate’s tier publications fall within Earth Science.
The evaluation also incorporated scientists’ awards and achievements in Earth Science as a relevant factor. The D-index threshold for defining top researchers is strategically incremented by 10, relative to the estimated population of scholars in each discipline, with the goal of encompassing the top 1% of leading experts. Furthermore, only those scientists whose general H-index and D-index diverged by less than 30% were considered, to assure a high fidelity to the Earth Science field. Achievements in the researcher’s area of study constituted an additional consideration within the assessment process.
Verification Practices and Data Integrity
The Research.com team recognizes the limitations of raw bibliometric data as an evaluative tool for scholarly output. Accordingly, all scientist profiles underwent manual verification and their publication records were cross-correlated with outputs indexed in a wide spectrum of trustworthy sources. While the quantity of papers in prominent journals and conference proceedings does not influence ranking position, it serves as a strong secondary indicator of scientific contribution.
Ranking positions are established by drawing on each researcher’s H-index, as sourced from OpenAlex and CrossRef, widely acknowledged as the premier bibliometric databases accessible to the global research community. For a detailed overview of the evaluation process, interested readers are encouraged to review the full description of methods on our methodology page.
Research.com Ranking Agenda
Research.com is committed to fueling progress in scientific research, innovation, and policy. Our mission is to motivate scientists, business leaders, and policymakers globally by revealing where top experts are leading breakthroughs and to empower the research community to identify the most distinguished authorities in specific disciplines, across nations, or within particular institutions.
Summary of Key Results
The 4th edition ranking reveals the following as the top universities in the Russian Federation that host the largest numbers of leading Earth Science scholars:
- Lomonosov Moscow State University: 3 leading scientists
- Novosibirsk State University: 2 leading scientists
- St Petersburg University: 2 leading scientists
On a global scale, the most prominent Earth Science scholars represent such esteemed institutions as Brown University, KU Leuven, Macquarie University, Curtin University, Utrecht University, University of Colorado Boulder, University of Hong Kong, China University of Geosciences, Xi'an Jiaotong University, and University of Bristol.
The highest D-index in Earth Science is attributed to Professor James W. Head (Brown University) with a remarkable D-index of 148. He is closely followed by Jean Poesen (KU Leuven) with a D-index of 147, and William L. Griffin (Macquarie University) with a D-index of 144.
In terms of aggregate metrics, the average total D-index for the top 5% of universities is 2,404, compared to an average of 377 for all 822 institutions participating in the ranking. The average number of published articles per university in the top 5% is 9,544, far surpassing the overall average of 1,521. Most notably, the researchers affiliated with the top 1% of universities account for an average of 279,971 citations, compared to an average of 80,226 citations for all 822 universities in the ranking.
These results underscore both the rigor and selectivity of the Research.com Best Earth Science Universities ranking and reflect the outstanding impact achieved by the most eminent scholars and institutions in the field of Earth Science.
