It sounds like the oil pan or gasket is a very possible problem considering the rate of the leak. You will need to put the vehicle on stands and follow the leak to the highest point to determine if its the pan or something higher up such as the crankshaft seal. With a leak that size it shoudlnt be too hard to determine the cause. Let me know if you have questions, thanks.
I'll opt-out and leave it open to other experts, maybe someone will have a better idea of exactly whats leaking. Dont reply otherwise question will be locked to me, thanks.
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You're going to need to remove the outer timing cover and get a closer look at what is going on. You are either going to have one of the camshaft seals or the front crankshaft seal leaking. Your leak is fast enough that it's coming from a pressurized source. It's very likely that you are going to find the oil coming out from behind the crank sprocket while the engine is running. This would be a leaking front crank seal. The front crank seal presses directly into the oil pump housing, and when this seal fails, or more likely has popped completely out of the housing, you will have pressurized oil coming straight out of the pump onto the ground.