Earthquake : The Seddon Earthquake

2165 WordsMar 14, 20169 Pages
In Seddon the aftershocks were a lot fewer but there were still 1,700 and only 45 being over magnitude 4. (see image 2). From the earthquake features discussed, we can see that despite the Seddon earthquake having a greater magnitude and similar type of fault movement, it was the fact that the Christchurch earthquake carried a lot more power and force with its initial ground movement and shaking, and its continual aftershocks, that the effects of this earthquake were much worse than the Seddon earthquake. In Christchurch, after the earthquake, more than half of the buildings in the central business district, around 10,000, had to be demolished, with a total of 100,000 homes damaged. Many heritage buildings were also badly damaged and some had to be demolished, with the most recognisable the Christchurch Cathedral. This damage in Christchurch was especially bad due to the effect of seismic lensing. Seismic lensing is caused during an earthquake when the p, s and I waves produced by the earthquake bounce of their surroundings. If these surroundings have hard surfaces the waves will rebound back in a similar direction to where they came from. Whereas if the surfaces properties are softer they can be
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