Bibliometric data used to derive the citation-based metrics for this ranking were collected on January 12, 2026. The ranking methodology centers on a researcher's discipline-specific metric known as the D-index (Discipline H-index). Unlike a general H-index, the D-index focuses solely on papers and corresponding citations pertinent to the specific academic discipline under examination—in this case, Earth Science. This approach ensures that the rankings reflect contributions directly relevant to the field.
Scope of Research and Qualification Criteria
The ranking draws from an extensive pool of 279,971 scientist profiles identified across a diverse range of bibliometric databases and disciplines. Specifically for Earth Science, 1,312 scholars were examined. To qualify for inclusion, scientists must have attained a minimum D-index of 30, and a majority of their tier publications needed to be firmly within the scope of Earth Science.
In addition to bibliometric thresholds, scientists’ awards and professional achievements in Earth Science were considered as supplementary criteria to ensure a holistic evaluation of their scholarly impact. The D-index threshold is dynamically set by increments of 10 based on the estimated total number of active scholars in each discipline. This stratification ensures that the top 1% of leading experts in Earth Science are represented in the ranking. Furthermore, a maximum proximity of 30% between a candidate’s general H-index and their D-index is required to ascertain that the researcher’s impact is discipline-focused.
Verification and Ranking Methodology
Recognizing that raw bibliometric data alone are insufficient for fully capturing scholarly output, all scientist profiles were meticulously manually verified. This verification process included cross-correlating authorship and publication records against an extensive range of trustworthy sources to affirm accuracy and relevance.
While the number of publications in prominent journals and conference proceedings is not a direct factor in determining ranking positions, it provides a valuable secondary signal of a scientist’s research contributions in their domain.
The confirmed rankings are primarily established based on researchers’ D-index scores derived from OpenAlex and CrossRef, which remain the most prominent and reliable bibliometric databases accessible to the academic community. For those interested in a detailed explanation of the methodology, please visit our methodology page.
Research.com’s Mission and Vision
At Research.com, our core mission is to motivate researchers, organizations, and policymakers globally to closely examine the trajectories of leading experts. We aim to provide the scientific community with a transparent, trustworthy, and accessible pathway to identify who the foremost authorities are in specific disciplines, geographic regions, and institutions.
By doing so, we aspire to foster greater collaboration, informed decision-making, and strategic investment in research areas driving innovation and societal progress worldwide. The creation of this ranking involved rigorous and meticulous work, reflecting our unwavering commitment to integrity and scientific excellence.
