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The quake of 22 Feb 2011 was Richter 6.3, but was very close to a major town (10km) and quite shallow (<10km). Some of its aftershocks were as shallow as 1km!
Ground accelerations may have been as high as 2G at some frequencies.
It is very difficult to design structures for greater than 1G.
There are three important elements in how am earthquake affects a building; the sizer of the quake; the transmission path to a particular site, including that of the specific building site; and the design of the building itself.
Due to ground resonances, the Q (the degree of amplification of the seismic forces) of ordinary sites is around 3 to 5. For a rock site it will be close to 1. For a swampy area, it will head towards 10. Mexico City holds the palm (I believe) for the highest Q, which reaches 15 at some frequencies important to seismicity.
That means that the ground acceleration will commonly be several times that of the native acceleration at that site.
A further problem is that of unstable sites. If you have a look at the Niigata Earthquake photos, you'll see several perfectly sound multi storey accommodation buildings, except they are up to 30 deg from plumb!
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoIn 1931 the Napier earthquake killed 255 people that was New Zealand's worst earthquake.
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What is goat island in New Zealand?
A small island north of Auckland (the big city in NZ) which is surrounded by a marine reserve and is great for snorkeling for the day.
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Every Wednesday night at 8:20pm.
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Auckland
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yes, because haiti had a big earthquake recently.
What city was hit by a big earthquake in 1931?
Napier. In 1931, New Zealand's deadliest earthquake devastated the cities of Napier and Hastings. At least 256 people died in the magnitude 7.8 earthquake 161 in Napier, 93 in Hastings, and 2 in Wairoa. Many thousands more required medical treatment
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A small island north of Auckland (the big city in NZ) which is surrounded by a marine reserve and is great for snorkeling for the day.
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112 square kilometres.
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Auckland, New Zealand
Why is NZ earthquake territory?
Science records about 14,000 earthquakes in and around New Zealand each year. Most are small, but between 100 and 150 are big enough to be felt. The Institute records these earthquakes on a nationwide network of instruments called seismographs. New Zealand's position on the boundary of the Australian and Pacific plates is the reason for the large number of earthquakes.
How big is Chile compared to New Zealand?
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