An earthquake measuring 7 on the Richter scale releases about how many times more energy than an earthquake with a magnitude of 6?

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What is the amplitude (in mm) registered on a standard seismograph (same as that used by Charles Richter) of a Magnitude 5 earthquake at 200km?

I don’t even know where to start with this problem D:

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If the LA earthquake had a magnitude of 6.5 on the Richter scale and the magnitude of the San Francisco earthquake had a magnitude 35 times as intense as the LA earthquake, what is the magnitude of the San Francisco earthquake?

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because there are so many formulas, i dont know which one is the known official one.

is it MAGNITUDE=log(intensity/intensity of standard earthquake)?
if it is, what is a standard earthquake?

thx pls help! math pw :PP

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USGS Reports
Magnitude 6.9 SOUTHERN QINGHAI, CHINA April 13, 2010
•Magnitude 6.3 SPAIN April 11, 2010
•Magnitude 6.8 SOLOMON ISLANDS April 11, 2010
•Magnitude 7.7 NORTHERN SUMATRA, INDONESIA April 06, 2010
•Magnitude 7.2 BAJA CALIFORNIA, MEXICO April 04, 2010
•Magnitude 4.4 GREATER LOS ANGELES AREA, CALIFORNIA March 16, 2010
•Magnitude 6.7 OFFSHORE BIO-BIO, CHILE March 16, 2010
•Magnitude 6.5 NEAR THE EAST COAST OF HONSHU, JAPAN March 14, 2010
•Magnitude 6.9 LIBERTADOR O HIGGINS, CHILE March 11, 2010
•Magnitude 6.1 EASTERN TURKEY March 08, 2010
•Magnitude 6.8 SOUTHERN SUMATRA, INDONESIA March 05, 2010
•Magnitude 6.6 OFFSHORE BIO-BIO, CHILE March 05, 2010
•Magnitude 8.8 OFFSHORE MAULE, CHILE February 27, 2010
•Magnitude 7.0 RYUKYU ISLANDS, JAPAN February 26, 2010
•Magnitude 6.9 CHINA-RUSSIA-NORTH KOREA BORDER REGION February 18, 2010
•Magnitude 3.8 ILLINOIS February 10, 2010
•Magnitude 5.9 OFFSHORE NORTHERN CALIFORNIA February 04, 2010
•Magnitude 6.2 BOUGAINVILLE REGION, PAPUA NEW GUINEA February 01, 2010
•Magnitude 5.9 HAITI REGION January 20, 2010
•Magnitude 4.0 OKLAHOMA January 15, 2010
•Magnitude 7.0 HAITI REGION January 12, 2010
•Magnitude 6.5 OFFSHORE NORTHERN CALIFORNIA January 10, 2010
•Magnitude 4.1 SAN FRANCISCO BAY AREA, CALIFORNIA January 07, 2010
•Magnitude 6.8 SOLOMON ISLANDS January 05, 2010
•Magnitude 7.1 SOLOMON ISLANDS January 03, 2010
•Magnitude 6.6 SOLOMON ISLANDS January 03, 2010

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I understand why so many people die in the Haiti earthquake but why were they so many few deaths compared to Haiti in the Loma Prieta earthquake which also was a similar magnitude (6.9)? What made the Loma Prieta earthquake kill only around 100 people? Was it the buildings, roads, speed of rescue? Any answers would be great.
Thank you very much, building standards. Great, thank you. More answers are welcome, the more the better.

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i just had a dream of two earthquakes of 8.0+ Magnitude in the US, it was on the map of USGS and it was in Taxes and new mexico, why am i seeing this? >:|, everything i ‘feel, see or hear’ comes True
do you think this might happen sometime Later in the years??
im only 15 and im scared

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How big was the magnitude of it?

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Okay, there have been a lot of earthquakes recently: a small on in Chicago, the one in Haiti, one in Chile, one in Mexico and one near Tibet, and now there’s volcanic activity in Iceland, which is basically a little chunk of land on a fault line. All of the earthquakes except for the 2.5 one in
Chicago have been above 7.0 in magnitude. Does this mean something’s going on with the earth’s crust?

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My family and friends have been hit hard because of the 2010 baja california earthquake. The magnitude was greater than the Haiti earthquake. Although the death toll doesnt compare at all, the damage done is unbelievable. Most of my family members live in Ejido Oaxaca, Mexico, which was right next to the Epicenter. I want to setup a website so people can donate money which can be helpful for Food and water. We have had a couple of phone calls to them and they said that the gallon of water has sky rocketed in the local markets to 60 pesos which is about 6 dollars. People dont have this kind of money so they need our help…

so far i have created this blog.

but now how do i make it so that people can see it and make a donation?..

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