Results from INSAR monitoring of the 2010–2011 New Zealand seismic sequence: EA detection and earthquake triggering

We used a variety of SAR-based techniques to measure the crustal deformation associated to the Darfield and Christchurch earthquakes, New Zealand. We detected clear post-seismic signals of the Darfield earthquake, and a pre-seismic signal spatially and temporally associated to the Christchurch earthquake. The small pre-seismic signal (∼25 mm) has an opposite polarity of the much larger co-seismic one (∼150 mm) in the same area.