Seismological and Hydrogeological Controls on New Zealand-Wide Groundwater Level Changes Induced by the 2016 M_w 7.8 Kaikōura Earthquake

Figure 6

Spatial distribution of water level changes, maximum PGV, and horizontal (geometric mean) PGA induced by the 2016 M_w 7.8 Kaikōura earthquake. Spatial distribution of the water level changes on a national scale compared to PGV (a) and PGA (c). Notably high levels of shaking occurred in the (i) Taranaki and (ii) Hawkes Bay regions. Spatial distribution of water level changes in central New Zealand as a function of PGV (c) and PGA (d). Notably high levels of shaking occurred in the (i) Marlborough, (ii) Wellington, and (iii) Manawatu-Wanganui regions. Red colours indicate high levels of PGV and PGA; green colours represent low levels of PGV and PGA. A transect through the surface rupture zone and the majority of monitoring wells is shown in Figure 8.