黎克特制
黎克特制（地震震級）（Richter magnitude scale），又叫近震震級（local magnitude，ML）、又譯里氏、芮氏震級，係表示地震規模大小嘅標度。佢係由觀測點處地震儀所記錄到嘅地震波最大振幅嘅常用對數演算出嚟。由於地震儀嘅位置並唔喺震央，考慮到地震波喺傳播過程中嘅衰減同埋其它干擾因素，計算時需減去觀測點所在地規模地震所應有嘅振幅去對數。
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