Acknowledgements - This blog post and the others in this series are primarily based on previously published work (Geng et al., 2018, 2019b, 2019a, 2020; Peace et al., 2018a, 2018b). In addition, the authors would like to highlight the contributions of Meixia Geng, J. Kim Welford and Colin Farquharson to this work, as well as thank the Geological Survey of Newfoundland and Labrador for assisting with access to the Bell Geospace Ltd. FTG data. The various undergraduate field assistants that contributed to this work are also gratefully acknowledged.