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>>but then again there was also an earthquake in Iran just a few hours ago

Noob question, what are the odds they were testing a nuclear weapon, and how would a foreign agency go about finding if they indeed did a test?

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Nuclear weapon detonations (particularly when tested underground, which is done mostly to avoid atmospheric contamination) can be identified through seismic arrays. The system is pretty reliable, and beyond the obvious task of distinguishing between natural and human causes, it is even capable of detecting the approximate origin. I remember reading an article about how even civilian arrays were capable of identifying tests in North Korea, and distinguishing between detonations, and the following cavity collapses.

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