The map below was sent to me by my colleague Lawrence Hill from the Agricultural Management and Property Department at Lincoln University. The map was constructed by Lawrence on 7 September 2010. The axes are latitude and longitude. The map locates the first 113 aftershocks.
A ‘brave’ interpretation of the line (calculated as the least squares line) is that it might approximate the fault line. The logic of such an interpretation is that the aftershocks are likely to be evenly spread about the major fault line. But that may prove to be a brave interpetation. My prior assumption had been that the fault would lie parallel rather than at right angles to the major Alpine Fault.
Does anyone have a map showing the actual fault line?
For a larger picture, click on the map.