One of the most widely accepted impact indexes of a publication to the society is Impact Factor (IF), which is annually reported by Thomson Reuters (Institute for Scientific Information, ISI). The Impact Factor is calculated by dividing the number of current year citations in ISI databases to the source items published in that journal during the previous two years. The IF value is reflected by authors/scientists of published papers, not always by the practitioners/users of published papers.
The Impact Factor of Landslides after its first release in 2008 has shown an almost continuous rise, especially in the last three years, from 0.986 to 3.049 in 2015. The Impact Factor and related data necessary for Impact Factor calculation from 2008 to 2015 are presented in Table 1. There is also a clearly visible rise of citable articles in 2013, when started bimonthly publication of the Landslides journal with 100 pages per issue (Vol. 10, Issues No. 1-4) and 150 pages per issue (Vol. 10. Issues No. 4-5), and again in 2014 when increased the size to 200 pages per issue (from Vol. 11 Issue No.3). The consequence of the rise of published citable articles is also an increasing citation of published articles of 40% in 2013, 23% in 2014 and 40% in 2015.
Impact Factors are calculated based on the number of citations of each article published in a journal during the previous two years, or five years for the five-year Impact Factor. The most cited articles published in Landslides journal, especially in years following the publication of an article, are the most important for a value of the Impact Factor. The five-year Impact Factor indicates the general quality of published articles and it is more appropriate for journals in certain fields such as landslides, because the body of citations may not be large enough to make reasonable comparisons, publication schedules may be consistently late, or it may take longer than two years to disseminate and respond to published works. Table 2. presents the 10 most cited manuscripts published in Landslides to the end of 2015 according to Institute for Scientific Information, ISI.
The most cited article is “The rainfall intensity-duration control of shallow landslides and debris flows: an update” prepared by Fausto Guzzetti, Silvia Peruccacci, Mauro Rossi and Colin P. Stark; Landslides Vol. 5. Issue No. 1 (2008) with 256 citations.
The Journal Impact
The influence and impact of a journal in the world of science is quantifiable according to positon of the journal in the Thompson Reuters Journal Citation Reports® related to the achieved Impact Factor. Thompson Reuters Journal Citation Reports® offers a systematic, objective means to critically evaluate the world’s leading journals, with quantifiable, statistical information based on citation data. By compiling articles’ cited references, JCR helps to measure research influence and impact at the journal and category levels, and shows the relationship between citing and cited journals (http://ipscience.thomsonreuters.com/product/journal-citation-reports).
Landslides journal, according to the Thompson Reuters Journal Citation Reports®, is ranked at the top of 35 journals in the category Engineering, Geological (1/35) and 32nd of 184 journals in category of Geosciences, Multidisciplinary (32/184) (see Table 3) (http://ipscience.thomsonreuters.com/product/journal-citation-reports).
The category Engineering, Geological, according to the Thompson Reuters Journal Citation Reports®, includes multidisciplinary resources that encompass the knowledge and experience drawn from both geosciences and various engineering disciplines (primarily civil engineering). Resources in this category cover geotechnical engineering, geotechnics, geotechnology, soil dynamics, earthquake engineering, geotextiles and geomembranes, engineering geology and rock mechanics. The much wider category Geosciences, Multidisciplinary covers resources having a general or interdisciplinary approach to the study of the Earth and other planets. Relevant topics include geology, geochemistry/geophysics, hydrology, paleontology, oceanography, meteorology, mineralogy, geography, and energy and fuels. Resources having a primary focus on geology, or geochemistry and geophysics are placed in their own categories (http://ip-science.thomsonreuters.com/mjl/scope/scope_scie).
Landslides journal has been on the top of the list of journals in the category Engineering, Geological continuously for the last three years and the difference in Impact Factor between the Landslides and the second ranked Acta Geotechnica is more than 0.6. The top 20 journals, their Impact Factors and total cites in 2015 in the category Engineering, Geological are listed in Table 4. In the much wider category Geosciences, Multidisciplinary, Landslides journal is ranked as 32nd after Journal of Glaciology (IF2015 = 3.109) and before Journal of Hydrology (IF2015 = 3.043) and Geomorphology (IF2015 = 2.813) (https://jcr.incites.thomsonreuters.com/JCRJournalHomeAction). It is important that Landslides journal has ranked in quartile Q1 for the last three years in the category Geosciences, Multidisciplinary because the position in quartile Q1 is another indicator of the quality and influence of a journal, especially in Europe. In the category Engineering, Geological the Landslides journal has been continuously in quartile Q1 from 2007, except 2008.