Christchurch’s Rugby World Cup stadium has been closed for two weeks to assess damage sustained when a major earthquake rocked the New Zealand city earlier this week. The venue operators said it would take until March 15 to determine if AMI Stadium could host World Cup matches later this year. They also said the playing field at the stadium had suffered “liquifaction” which is caused when a seismic tremor loosens the bonds between soil articles, turning it into a quagmire. The venue is scheduled to host seven games, including two quarter-finals, during rugby’s showcase tournament.