Mark Zumberge: Basically a seismometer is a box with a spring with a mass hanging inside, and as the ground shakes the mass goes up and down.
马克•藏伯格：地震仪的基本模型是一个箱体，箱内装置弹簧，弹簧上悬挂重物，地震来临时，重物在竖直方向上振动。
Mark Zumberge: Basically a seismometer is a box with a spring with a mass hanging inside, and as the ground shakes the mass goes up and down.
马克•藏伯格：地震仪的基本模型是一个箱体，箱内装置弹簧，弹簧上悬挂重物，地震来临时，重物在竖直方向上振动。
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