This month's special section presents three papers that deal with geophysics in the northern frontiers. Geophysical exploration in the northern frontiers is becoming increasingly important because these areas contain a significant portion of the world's undiscovered oil and gas. Recently, the USGS published a study (Gautier et al., 2009) based on probabilistic modeling that concluded that the area north of Arctic Circle may contain 30% of the world's undiscovered gas and 13% of the world's undiscovered oil. This is a significant resource, especially when combined with the oil and gas reserves that have already been discovered in the north, but that have not yet been developed.

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