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Sorry, I forgot to tell you that I made a blog/website about Vancouver 2010 Winter Olympics. Although Vancouver 2010 is over, you can check out the website. It is olympics2010winter.blogspot.com.

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Do you love Hardy Boys, Nancy Drew, Harry Potter, Magic Tree House, Capitol Mysteries, Calendar Mysteries, A-Z Mysteries, or any other books?

If you want to send comments about them, just send a comment for me below. You will have to give email, gender, what book you like, the author of the book and your first name. I will try my best to deliver them to the authors. I will email you if that is possible. Maybe if you get a letter back from the author, I will send it to your email address so give a correct email address!!!

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Great earthquakes occur once a year, on average. The largest recorded earthquake was the Great Chilean Earthquake of May 22, 1960 which had a magnitude (M_W) of 9.5.^[6]

The following table lists the approximate energy equivalents in terms of TNT explosive force^[7] - though note that the energy here is that of theunderground energy release (i.e. a small atomic bomb blast will not simply cause light shaking of indoor items) rather than the overground energy release. Most energy from an earthquake is not transmitted to and through the surface; instead, it dissipates into the crust and other subsurface structures.

Richter Approximate Magnitude	Approximate TNT for Seismic Energy Yield	Joule equivalent	Example
0.0	1 kg (2.2 lb)	4.2 MJ
0.5	5.6 kg (12.4 lb)	23.5 MJ	Large hand grenade
1.0	32 kg (70 lb)	132.3 MJ	Construction site blast
1.5	178 kg (392 lb)	744.0 MJ	WWII conventional bombs
2.0	1 metric ton	4.18 GJ	Late WWII conventional bombs
2.5	5.6 metric tons	23.5 GJ	WWII blockbuster bomb
3.0	31.6 metric tons	132.3 GJ	Massive Ordnance Air Blast bomb
3.5	178 metric tons	747.6 GJ	Chernobyl nuclear disaster, 1986
4.0	1 kiloton	4.18 TJ	Small atomic bomb
4.5	5.6 kilotons	23.5 TJ
5.0	31.6 kilotons	134.4 TJ	Nagasaki atomic bomb (actual seismic yield was negligible since it detonated in the atmosphere) Lincolnshire earthquake (UK), 2008
5.5	178 kilotons	747.6 TJ	Little Skull Mtn. earthquake (NV, USA), 1992 Alum Rock earthquake (CA, USA), 2007 2008 Chino Hills earthquake (Los Angeles, USA)
6.0	1 megaton	4.18 PJ	Double Spring Flat earthquake (NV, USA), 1994
6.5	5.6 megatons	23.5 PJ	Caracas (Venezuela), 1967 Rhodes (Greece), 2008 Eureka Earthquake (Humboldt County CA, USA), 2010
6.7	11.2 megatons	46.9 PJ	Northridge earthquake (CA, USA), 1994
6.9	22.4 megatons	93.7 PJ	San Francisco Bay Area earthquake (CA, USA), 1989
7.0	31.6 megatons	132.3 PJ	Java earthquake (Indonesia), 2009 2010 Haiti Earthquake
7.1	44.7 megatons	186.9 PJ	Energy released is equivalent to that of Tsar Bomba (50 megatons, 210 PJ), the largest thermonuclear weapon ever tested 1944 San Juan earthquake
7.5	178 megatons	744.0 PJ	Kashmir earthquake (Pakistan), 2005 Antofagasta earthquake (Chile), 2007
7.8	501 megatons	2.10 EJ	Tangshan earthquake (China), 1976 Hawke's Bay earthquake (New Zealand), 1931)
8.0	1 gigaton	4.18 EJ	San Francisco earthquake (CA, USA), 1906 Queen Charlotte earthquake (BC, Canada), 1949 México City earthquake (Mexico), 1985 Gujarat earthquake (India), 2001 Chincha Alta earthquake (Peru), 2007 Sichuan earthquake (China), 2008 1894 San Juan earthquake
8.5	5.6 gigatons	23.5 EJ	Toba eruption[citation needed] 75,000 years ago; the largest known volcanic event Sumatra earthquake (Indonesia), 2007
8.8	15.8 gigatons	66.3 EJ	Chile earthquake, 2010
9.0	31.6 gigatons	132.3 EJ	Lisbon Earthquake (Lisbon, Portugal), All Saints Day, 1755
9.2	63.1 gigatons	264.0 EJ	Anchorage earthquake (AK, USA), 1964
9.3	89.1 gigatons	372.9 EJ	Indian Ocean earthquake, 2004
9.5	178 gigatons	744.0 EJ	Valdivia earthquake (Chile), 1960
10.0	1 teraton	4.18 ZJ	Never recorded by humans
13.0	108 megatons	372.9 ZJ	Yucatán Peninsula impact (causing Chicxulub crater) 65 Ma ago (108 megatons = 100 teratons; almost 5x1030 ergs = 500 ZJ).[8][9][10][11][12]

Earthquake Effects

The following describes the typical effects of earthquakes of various magnitudes near the epicenter. This table should be taken with extreme caution, since intensity and thus ground effects depend not only on the magnitude, but also on the distance to the epicenter, the depth of the earthquake's focus beneath the epicenter, and geological conditions (certain terrains can amplify seismic signals).

Richter magnitudes	Description	Earthquake effects	Frequency of occurrence
Less than 2.0	Micro	Microearthquakes, not felt.	About 8,000 per day
2.0-2.9	Minor	Generally not felt, but recorded.	About 1,000 per day
3.0-3.9		Often felt, but rarely causes damage.	49,000 per year (est.)
4.0-4.9	Light	Noticeable shaking of indoor items, rattling noises. Significant damage unlikely.	6,200 per year (est.)
5.0-5.9	Moderate	Can cause major damage to poorly constructed buildings over small regions. At most slight damage to well-designed buildings.	800 per year
6.0-6.9	Strong	Can be destructive in areas up to about 160 kilometres (100 mi) across in populated areas.	120 per year
7.0-7.9	Major	Can cause serious damage over larger areas.	18 per year
8.0-8.9	Great	Can cause serious damage in areas several hundred miles across.	1 per year
9.0-9.9		Devastating in areas several thousand miles across.	1 per 20 years
10.0+	Epic	Never recorded; see below for equivalent seismic energy yield.	Extremely rare (Unknown)

(Based on U.S. Geological Survey documents.)^[5]