Tuesday, 7 September 2010

Canterbury Earthquakes part II

Since posting last night, there's been several more aftershocks, including several big ones. The total now stands (at 7:00pm) at 304 aftershocks, 70 greater than 4 on the Richter scale, 29 greater than 4.5, and 10 greater than 5. A couple of the fives happened last night, waking us up, and causing more damage to several buildings around town.



This evening's installment is a map of the region of Canterbury where the earthquakes have been centred, showing the epicentre of all aftershocks and their magnitudes. It appears that while smaller tremours have been centred fairly widely, the larger magnitude earthquakes have been centred more around the epicentre of the initial 7.1 quake. As before, I've made the the data and R code available.

The region around the epicentre of the initial quake has been surveyed by GNS scientists. They've got some pretty awesome aerial photos showing the location of the fault on their webpage detailing their work.

5 comments:

Simon said...

Thanks for the nice chart and codes.
Would you please upload the Canterbury_towns.csv file?

Samuel Brown said...

Canterbury_towns.csv is available here

Thanks for your interest!

Simon said...

Got it.
Very useful visualization.
Thank you very much.

Bob Muenchen said...

Nice example! You might consider alternate colors as I believe red is perceived as standing out more & also indicates danger. I like to use either shades of one color (e.g. dim red to bright red) or, when many levels are displayed, from one color to another (e.g. green (safer) to red (more destructive).

Cheers,
Bob Muenchen

Nathan said...

Do you not use Red and Green cause your color blind?