Up to 700 to date but only thirty in past three days so signs of diminishing activity!
There have been only 2 "significant" earthquakes in San Diego since 1800. 1800 - 6.5 earthquake in San Diego 1986 - 5.3 earthquake in Oceanside There have been smaller earthquakes. In addition, residents of San Diego have been able to feel other earthquakes that were centered elsewhere.
Most certainly. They've been happening since the crust formed.
Earthquakes really don't influence the atmosphere. Earthquakes only influence the earth, since the atmosphere is free to move above it. The only exception would be if an earthquake demolished an entire city, releasing massive amounts of dust into the air, but that would still be a localized effect.
An earthquake takes place when the plates rub against each other, the movement forces waves of energy to come to the earth surface. This causes tremors and shakes, and then we can say that an earthquake has taken place.
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Christchurch is still getting aftershocks every day - almost 15 months since the very first earthquake on 4th September 2010 and they are expected to continue for years.
There have been over 9,000 earthquakes and aftershocks in Christchurch since the very first one on September 4th 2010. However the main 3 days these occured were: Saturday 4 September 2010 at 4:35 am. Magnitude 7.1. Tuesday 22 February 2011 at 12:55 pm. Magnitude 6.3. Monday 13 June 2011. 2 big earthquakes - 1:00pm magnitude 5.6 followed by a magnitude 6.3 at 2:20pm.
Christchurch has had over 9,000 earthquakes and aftershocks since the very first one on 4 September 2010. That one happened at 4:35am on a Saturday morning. The worst one was 22 Feb 2011 when 182 people died, most of them crushed under buildings that collapsed. That earthquake struck just after mid-day at 12:55pm. It was a Tuesday.
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since September 2010 there have been around 14,000 aftershocks in CHCH
The 24th of September was on a Saturday since 1949 in 1955, 1960, 1966, 1977, 1983, 1988, 1994, 2005 and 2011.
To date today (24 November 2011) there have been just over 9,000. These still occur every day.
Since theFfebruary 22 earthquake the Christchurch bus exchange no longer exists as it was totally destroyed.
The 2010 Christchurch earthquake was of magnitude 7.1. The 2011 Christchurch earthquake was of magnitude 6.3. The 2011 Japan earthquake was of magnitude 9.0. The formula for comparing the energy released by two earthquakes using the moment magnitude scale (which is what I assume those numbers are in, since it's the most common scale for large earthquakes) is D=103*(m1 - m2)/2 So compared to the more recent Christchurch earthquake, we get that the Japan earthquake was about 103*(9.0-6.3)/2 = 103*2.7/2 = 104.05 which we can tell even without actually doing the calculations is a bit over 10,000 times more powerful in terms of total energy released. (this does not, however, mean 10,000 times more damage).
since when?
There are earthquakes all the time, and there have been earthquake since the Earth was created.
Since the earthquake avoid all suburbs in the east and next to the CBD.