Here is a large aftershock M7 near the island closest to the mainshock M8.
USGS site page
Here is a summary poster of the tectonics in the region:
USGS site page
USGS poster (68MB pdf)
another large aftershock M7
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Tag Archives: subduction
M8 in the Santa Cruz Islands region (Vanuatu subduction zone, New Hebrides trench)
M8 Earthquake following a couple weeks of increased seismic activity in the region. located at the northern end of this subduction zone. Here is a map of the subduction zone:
Here is the USGS web page for the earthquake.
Here is a map of the slab for the subduction zone there (3MB pdf).
Here is a google earth map of the epicenter: