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的判定。因此，需要预先将断层分布、地表地质情况等数据录入预警系统。如美国地质调查局依据国家地震减灾计划（英语：Earthquake Hazards Reduction Act of 1977）的场地划分关系表及场地分类图将地表地质划分为B、C、D、E四类，从而在地震速报中快速生成ShakeMap（英
1998，第66頁. Brown & Tager 2000，第50頁. Perley, Sidney. Historic Earthquakes. Earthquake Hazards Program. USGS. 2014-04-18 [2011-02-07]. （原始内容存档于2011-11-10）. Memorandum
2015-04-21 [2015-04-24]. （原始内容存档于2020-10-20）. Earthquakes in Oklahoma of M3+. Earthquake Hazards Program. United States Geological Survey. 2014-09-24 [2015-04-24]