Even in large earthquakes the intense shaking generally lasts only a few tens of seconds, but it can last for minutes in the greatest earthquakes. These are the waves that do the most damage to our buildings, highways, etc. Near an earthquake the shaking is large and dominated by shear-waves and short-period surface waves. The are many different seismic waves, but all of basically of four types:Īn earthquake radiates P and S waves in all directions and the interaction of the P and S waves with Earth's surface and shallow structure produces surface waves. An earthquake is a more complicated process than a stone splashing into water, and the seismic waves that are set up during an earthquake are more varied than those on the pond. You can picture this concept by recalling the circular waves that spread over the surface of a pond when a stone is thrown into the water. Seismic waves are propagating vibrations that carry energy from the source of the shaking outward in all directions. Like this time*thisComp.layer('Black Solid 1').effect('Slider Control')('Slider') Now you control the speed with the slider and keyframe down to zero to stop it.When you look at a seismogram the wiggles you see are an indication that the ground is being, or was, vibrated by seismic waves. You can just use the expression time*#value then pickwhip value to the expression slider so the expression looks Control Expressions with Sliders in AE | - YouTubeĪCtually my example is overly complicated. The example is slightly different as it is using a wiggle expression on the position rather than a time multiplier on rotation but hopefully in combination with my above explanation you should be able to work out to get it done. So now here is video going over the general principle. When the slider value reaches 0, 13 will be mu tiplied by zero resulting in a rotation speed of zero. This will multiply 13 * 1 resulting in a rotation speed of 13, Now you key frame the sliders value down from 1 to 0 which will gradually slow the rotation down. Now your expression should look like this (time*13)*thisComp.layer('Black Solid 1').effect('Slider Control')('Slider')

Then edit your expression to (time*13)* Place the cursor right after the final multiplication symbol use the expression pickwhip to connect to the slider value. Then you create a null or solid and apply the Effect>Expression Controls>Slider Control.

I am just using 13 for the sake of an example. So you would create an expression on the Y rotation something like time*13 You can play with the value to get the rotation speed you want. You could rotate the characters via time expressions and then connect the multiplier to a slider control which you animate one to zero.

Slow wiggle expression after effects