Abstract

The 1963 Baffin Island earthquake of MS 6.2 is reanalyzed to determine whether or not it involved normal faulting, as previously suggested. The revised fault-plane solution has nodal planes with strike 113°, dip 66°, rake 235° and strike 352°, dip 41°, rake 322°. The T-axis trends 227° and plunges 14°, and the P-axis trends 338° and plunges 55°. Thus though this solution confirms normal faulting, it suggests a larger strike-slip component than most previous studies. The tension axis is oriented SW, which is normal to the NW geographic trend of Baffin Island. We consider that the normal-fault regime could be a transient phenomena related to extensional stress in the glacial forebulge presently centered over northeast Baffin Island, and is associated with incomplete postglacial rebound. However, future geophysical measurements such as heat flow, in-situ stress and vertical uplift rate, as well as more fault-plane solutions are required to test this hypothesis.

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