From the Super Mario Wiki, the Mario encyclopedia
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Mario and his partner jump on an enlarged Diamond Star as a long blue gauge appears, with several circles along it in random positions. The gauge will start filling up with a green bar from left to right, and when it passes through a circle, the A button must be pressed. If it is not pressed, or the timing is off, the Action Command stops. Earth Tremor's attack is piercing and is capable of damaging invisible enemies.
The potential attack power increases as each of the five gauges are completed, shown by the Diamond Star itself becoming larger; when a gauge is filled, the next gauge will add an extra circle and the green bar's speed will increase. The attack power starts off at 1, and can reach a maximum of 6 if done perfectly. With each bar completed, the height reached by the tremors also increases:
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