Anybody know of anyway to create a low rumbling earthquake like sound? The only way i've managed to see online is to rub a balloon, but the rumbling is short when I can actually make the sound. Any suggestions? I am going to assume o lot of processing will need to take place, but looking for an initial sound to record and work with.
If you want a textured rumble I've made them by processing source sounds like fires, a roller door, animals stampeding etc... processing = a low pass filter plus a subharmonic generator eg LowEnder plug.... Be careful where you set your LPF, good rumbles are in the LCR speakers as well as the sub...
Camel Audio Alchemy is brilliant for this as you can use either waveforms or sampled sources or a combination of those. After that it's a case of just modulating and filtering it.
But you can of course get all kinds of rumbling by just low pass filtering a heavily modulated or noise containing synth patch.
I use several different techniques for rumble, but blowing in cardioid condenser mics and shaking a humongous sheet of thin steel is what I use the most. Other good things is grinding a large boulder on the ground and pitching it, or large waterfalls from certain angles.
The shockwave in the sound used for the first atomic bomb was a recording from the Niagara Falls, slowed down. The explosion was actually regular dynamite razing a house, as it burns very slow for an explosive!
Yet another good rumble, though I can't remember where it was used right now, was a room filled with a very old but sturdy newspaper printing-press.
When it comes to synthesizers, I never use them for this kind om sound. There are things they are great for, but their sound is far too synthetic to make a convincing earthquake.
Lie your mic (without any stands etc) down on a picnic table, then drag something heavy along the surface of the table. I'd say a contact mic would work best with this, but anything would do really; I used the internal mics on my portable recorder.
I accidentally got some nice sounds this way, the vibrations in the table recorded by your mic will be a nice low frequency rumble. I personally was dragging a brick across a spare paving slab, on top of the table, with my DR100 on the table too.
EDIT: (The picnic table was also on paving slabs, but this may work with it on bare ground too)