Bibliometric data utilized to calculate citation-based metrics were collected as of January 12, 2026. The ranking position of each scientist is determined by their D-index (Discipline H-index), a discipline-specific variant of the traditional H-index that includes only publications and citation metrics relevant to the field under examination—in this instance, Earth Science.
Scope of Research and Selection Criteria
This ranking comprehensively examined 279,971 scientist profiles aggregated from a variety of bibliometric data sources across all disciplines, with a focused subset of 288 scientists identified specifically within Earth Science. To qualify for inclusion, a scientist was required to have a D-index of at least 30, ensuring that only those with substantial impact within the discipline were considered. Furthermore, the majority of tier publications attributed to each scientist had to be closely associated with Earth Science research.
Additional evaluative factors included recognition of notable awards and achievements pertinent to the Earth Science domain, providing a qualitative dimension to the quantitative criteria. The D-index thresholds for top researchers were calibrated incrementally by tens relative to the estimated total number of scholars per discipline, thereby ensuring the inclusion of the top 1% of leading scholars within the list.
Another critical inclusion metric was the proximity between a scientist’s general H-index and their D-index, which needed to be 30% or less. This criterion was instituted to confirm a researcher’s primary engagement in Earth Science, preventing those with broadly interdisciplinary or unrelated research portfolios from skewing the ranking.
Verification and Validation Practices
Recognizing that raw bibliometric data are never intended to serve as an absolute measure of scholarly impact, the Research.com team conducted meticulous manual verification of all scientist profiles. Each profile was cross-correlated against publications indexed in a wide array of trustworthy and authoritative sources to ensure integrity and accuracy.
Although not a direct factor in determining a researcher’s ranking position, the number of published papers in prominent journals and conference proceedings serves as a valuable secondary indicator of scholarly contribution within the specific scientific area. The final ranking positions are established based on each researcher's validated D-index derived from the aggregated data from OpenAlex and CrossRef—two of the most prominent and respected bibliometric databases accessible to the research community.
For a detailed overview of the methodologies employed, please refer to our methodology page.
Research.com’s Mission and Agenda
At Research.com, our mission is to empower researchers, companies, policymakers, and academic institutions worldwide by providing transparent and reliable tools to discern where leading experts are making impactful contributions. By offering a platform to identify and recognize the leading authorities in specific scientific disciplines—across countries and within individual research institutions—we aim to foster collaboration, informed decision-making, and strategic research development.
Our rankings serve not simply as a recognition of individual achievement but as a resource to catalyze dialogue and progress within the broader scientific ecosystem, helping stakeholders stay attuned to emerging trends and research frontiers.
