The document summarizes GNS Science's experience communicating science during the Canterbury Earthquake Sequence crisis in New Zealand from 2010 to present. It describes the sequence of damaging earthquakes, their impacts, and GNS Science's science communication activities. It discusses what worked well in the communication efforts, including cross-organization engagement and rapid sharing of high quality information. It also examines difficulties like being underprepared for the scale of the event and technical advice not being strongly integrated into the official response process. The document outlines plans to improve future crisis communication, such as developing engagement protocols and exercises in advance.