里氏震级(英语:Richter magnitude scale),也叫近震震级(记作 ML),英语:local magnitude,又称地方性震级),是一种表示地震规模大小个标度。渠是由观测点处地震仪所记录到个地震波最大振幅个常用对数演算而来。震级定义拉距离震中100千米处个观测点地震仪记录到个最大水平位移为1微米(迭也是伍德-安德森扭力式地震仪个最高精度)个地震作为0级地震。如果录得按照迭个定义,如果距震中100千米处个伍德-安德森扭力式地震仪测得个地震波振幅为10微米(0.01毫米)为1级,100微米(0.1毫米)为2级,1000微米(1毫米)为黎克3级,如此类推。
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