The good news : The last 5 hours, no important aftershocks have been registered, although M +4 aftershocks can be felt well by the local population
The bad news : Local people have experienced already a lot of aftershocks and a lot more to come (based on other earthquakes with this magnitude)
Although almost no major aftershocks have occurred the last 24 hours (earthquakes of M 4.5 or more are internationally published on USGS en EMSC, but the last 24 hours no new quakes have been registered by them), the image hereunder shows tens and tens of aftershocks as measured in Mc Queens Valley on Banks Peninsula, Canterbury.
The seismograph (Courtesy GeoNet New Zealand – click on the image to go to their scientific website) is a live picture with the most recent timestamp. The original M 7.1 quake cannot be seen on this picture.
The timestamp shown at the top right of the seismograph drum shown below is the time when this image was last refreshed. Each horizontal line (or trace) represents 30 minutes, each vertical line is spaced 1 minute apart; 24 hours of recording are displayed in total. The most recent signal is drawn at the bottom right hand corner of the drum. Then read the traces from right to left, bottom to top, to get from the most recent to the oldest signals. The trace will appear red if the signals are very large; this means they have been clipped to stop them overwriting too much of the surrounding image.
The seismograph gives an idea about the frightening experience people from Canterbury are living in at the moment.
Earthquake-Report.com comment : Looking into the detailed list of GNS Science from today, we have noticed that USGS has missed a big one with Magnitude 5 at 1:04 PM (Sept. 5)