In One Piece Shockwaves are as described below: The most prime example being Sai's Hassoken is called Eight Impact Fist which deals internal damage and is a shockwave which bypasses conventional defense.

Rob Lucci's Rokuogan is exactly like an Impact Dial but stronger of which deals internal damage and is a shockwave which bypasses conventional defense.

The aforementioned Impact Dial...

Jimbei sends shockwaves through the air's water which deals internal damage and bypasses conventional defense.

Killer uses sonic vibrations to make Shockwaves which deal internal damage and bypass conventional defense.

Marco uses a Shockwave to deal internal damage and bypass conventional defense.

And even Whitebeard's Quake Quake Fruit makes the user able to generate large vibrations/shockwaves with his punches and attacks.

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And also:

These are all shockwaves whether they are achieved through different ways from martial arts, tech, a devil fruit, the air, sound, the water, a technique, or otherwise they all are shockwaves nonetheless and as I have said they deal internal damage and bypass conventional defense (they can even harm Luffy through his Rubber Body's like immunity to bluntforce).