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We have investigated the possible cause-and-effect relationship due to stress transfer between twoearthquakes that occurred near Christchurch, New Zealand, in September 2010 and in February 2011. TheMw 7.1 Darfield (Canterbury) event took place along a previously unrecognized fault. The Mw 6.3Christchurch earthquake, generated by a thrust fault, occurred approximately five months later, 6 kmsouth-east of Christchurch’s city center. We have first measured the surface displacement field to retrievethe geometries of the two seismic sources and the slip distribution. In order to assess whether the firstearthquake increased the likelihood of occurrence of a second earthquake, we compute the Coulomb FailureFunction (CFF). We find that the maximum CFF increase over the second fault plane is reached exactlyaround the hypocenter of the second earthquake. In this respect, we may conclude that the Darfield earthquake contributed to promote the rupture of the Christchurch fault

Did the September 2010 (Darfield) earthquake trigger the February 2011 (Christchurch) event?