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The general method is to generate more artificial data for the minority class that is the earthquake occurrence data. But the most popular oversampling methods generate synthetic samples along line segments that join minority class instances, which is not suitable for earthquake precursor data. In this paper, we propose a Safe Zone Synthetic Minority Oversampling Technique (SZ-SMOTE) oversampling method as an enhancement of the SMOTE data generation mechanism. SZ-SMOTE generates synthetic samples with a concentration mechanism in the hyper-sphere area around each selected minority instances. The performance of SZ-SMOTE is compared against no oversampling, SMOTE and its popular modifications adaptive synthetic sampling (ADASYN) and borderline SMOTE (B-SMOTE) on six different classifiers. The experiment results show that the quality of earthquake prediction using SZ-SMOTE as oversampling algorithm significantly outperforms that of using the other oversampling algorithms.<\/jats:p>","DOI":"10.1142\/s0218001421550132","type":"journal-article","created":{"date-parts":[[2021,10,12]],"date-time":"2021-10-12T02:22:00Z","timestamp":1634005320000},"source":"Crossref","is-referenced-by-count":7,"title":["A Safe Zone SMOTE Oversampling Algorithm Used in Earthquake Prediction Based on Extreme Imbalanced Precursor Data"],"prefix":"10.1142","volume":"35","author":[{"given":"Dongmei","family":"Wang","sequence":"first","affiliation":[{"name":"School of Computer Science, Wuhan University, Wuhan 430072, P.\u00a0R.\u00a0China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8297-5009","authenticated-orcid":false,"given":"Yiwen","family":"Liang","sequence":"additional","affiliation":[{"name":"School of Computer Science, Wuhan University, Wuhan 430072, P.\u00a0R.\u00a0China"}]},{"given":"Xinmin","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Cyber Science and Engineering, Wuhan University, Wuhan 430072, P.\u00a0R.\u00a0China"}]},{"given":"Hongbin","family":"Dong","sequence":"additional","affiliation":[{"name":"School of Cyber Science and Engineering, Wuhan University, Wuhan 430072, P.\u00a0R.\u00a0China"}]},{"given":"Chengyu","family":"Tan","sequence":"additional","affiliation":[{"name":"School of Computer Science, Wuhan University, Wuhan 430072, P.\u00a0R.\u00a0China"}]}],"member":"219","published-online":{"date-parts":[[2021,10,12]]},"reference":[{"key":"S0218001421550132BIB001","doi-asserted-by":"publisher","DOI":"10.1109\/TNNLS.2018.2878400"},{"key":"S0218001421550132BIB002","first-page":"1","volume":"18","author":"Balakrishnama S.","year":"1998","journal-title":"Inst. 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