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In North America, like many regions worldwide, predicting the timing of drought events is challenging. However, our novel study in climate research explores whether the Drought Monitor database exhibits fractal characteristics, represented by a single scaling exponent. This database categorizes drought areas by intensity, ranging from D0 (abnormally dry) to D4 (exceptional drought). Through vibration analysis using power spectral densities (PSD), we investigate the presence of power-law scaling in various statistical moments across different scales within the database. Our multi-fractal analysis estimates the multi-fractal spectrum for each category, and the Higuchi algorithm assesses the fractal complexity, revealing that D4 follows a multi-fractal pattern with a wide range of exponents, while D0 to D3 exhibit a mono-fractal nature with a narrower range of exponents.<\/jats:p>","DOI":"10.1186\/s13634-023-01094-z","type":"journal-article","created":{"date-parts":[[2024,1,2]],"date-time":"2024-01-02T11:02:24Z","timestamp":1704193344000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Classification of drought severity in contiguous USA during the past 21 years using fractal geometry"],"prefix":"10.1186","volume":"2024","author":[{"given":"Sepideh","family":"Azizi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1199-3525","authenticated-orcid":false,"given":"Tahmineh","family":"Azizi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,1,2]]},"reference":[{"issue":"4","key":"1094_CR1","doi-asserted-by":"publisher","first-page":"434","DOI":"10.1108\/09653561111161752","volume":"20","author":"Y Ding","year":"2011","unstructured":"Y. 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