Ristau, John. “The Canterbury, New Zealand Earthquake Sequence II: The MW 6.2 Christchurch Earth- Quake of 21 February 2011 and Continuing Aftershock Sequence”. Summary of the Bulletin of the International Seismological Centre 48, no. 1-6 (January 1, 2015): 75-99. Accessed April 24, 2024. http://publications.isc.ac.uk/index.php/summary/article/view/13.