Kind of a simple question, hopefully. Is a swarm's swarm attack considered an area effect, so that if two swarms occupy the same area, they each take 50% additional damage from the other swarm's swarm attack?
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Swarm Traits: A swarm has no clear front or back and no discernable anatomy, so it is not subject to critical hits or flanking. A swarm made up of Tiny creatures takes half damage from slashing and piercing weapons. A swarm composed of Fine or Diminutive creatures is immune to all weapon damage. Reducing a swarm to 0 hit points or less causes it to break up, though damage taken until that point does not degrade its ability to attack or resist attack. Swarms are never staggered or reduced to a dying state by damage. Also, they cannot be tripped, grappled, or bull rushed, and they cannot grapple an opponent.
A swarm is immune to any spell or effect that targets a specific number of creatures (including single-target spells such as disintegrate), with the exception of mind-affecting effects (charms, compulsions, morale effects, patterns, and phantasms) if the swarm has an Intelligence score and a hive mind. A swarm takes half again as much damage (+50%) from spells or effects that affect an area, such as splash weapons and many evocation spells.
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Swarm Attack: Creatures with the swarm subtype don't make standard melee attacks. Instead, they deal automatic damage to any creature whose space they occupy at the end of their move, with no attack roll needed. Swarm attacks are not subject to a miss chance for concealment or cover. A swarm's statistics block has "swarm" in the Melee entry, with no attack bonus given. The amount of damage a swarm deals is based on its Hit Dice, as shown below.
The Swarm Attack clearly affects every creature in its area, so it would qualify for the +50% damage. There's a slight hinkyness in that you could try to argue that swarm damage is weapon damage that might be reduced by swarm traits, but that doesn't make sense if you look at the reason why swarms don't take damage from normal weapons.
So yeah, you're good; both swarms will eat each other FAST.
Yay! Not only does that read like a sound interpretation of the rules, but it also incidentally plays right into my wicked swarm-based schemes! It's a swarm-eat-swarm world out there! Thanks for the input.