Just wondering if any of you have any tried and true techniques or suggestions for designing lava and/or volcano sounds (anything from volcanic eruption, flowing lava, molten volcanic rock movement, etc)
A few ideas:
access the real thing! There are plenty of geothermal areas in the world which people have recorded... eg theres 58 geysers on sounddogs - use them and/or youtube as a reference if nothing else
snow, ice, avalanche, water & explosion sounds are all good source material for manipulation eg completely take the attack off an explosion and you have an element of a geyser - layer it with eg a pitched down water burst/hose gush... I've also in the past taken single ocean wave breaks, pitched it down/EQ'd it & then created a doppler/pitch curve on it, since the water spraying out of a geyser is going to doppler to a degree from your pov....
perform EQ sweeps rolling most of the high freq off snow or ice movement & you can get some good murky gritty movement that could work for lava...
for volcanic rock movement, an obvious starting point is rock movement, so try close micing grinding heavy rocks together & add subharmonic synth processing (LowEnder plugin or dbx120 outboard) - doing pitch curves on these may help evoke their movement
i have some sounds in my library called 'erratic pass' that I made years ago in Metasynth using white noise as a source & applying lots of pitch modulation to it so its kind of bubbly and erratic... Then I processed those with doppler plugin and EQ sweeps to provide movement & create lots of variations.. its useful as a layer as its bright/cuts through, but when layered under real sounds you definitely dont 'read' it as synthetic or artificial... Could be useful under a geyser spray, just for a brief moment, as effectively water is spraying everywhere, so it is an erratic burst of hiss :)