The enigmatic Bala earthquake of 1974
Acknowledgments. In drawing together the material for this paper on an earthquake that occurred 30 years ago, it has been necessary to revisit the working files of many past colleagues in IGS/BGS, whose contributions I would like to acknowledge collectively. The National Grid and other Ordnance Survey data are used with the permission of the Controller of Her Majesty's Stationery Office, Licence No: 100017897/2005. This paper is published with the permission of the Executive Director of the BGS (NERC).
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