资料题：The San Andres fault is（　）。

The US government has recently helped people learn more about the dangers of earthquakes by publishing a map.This map shows the chances of an earthquake in each part of the county.The areas of the map where earthquakes are mot likely to occur are called earthquake" belts".The government is spending a great deal of money and is working hard to help discover the answer these two questions:(1)Can we predict earthquake? (2)Can we control earthquakes?To answer the first question, scientists are looking very closely a the most active fault systems in the county, such as the San Andrews fault in California.A fault is a break between twosection of the earth's surface.These breaks between sections are the places where earthquakes occur.Scientists look at the faults for changes which might show that an earthquake was about tooccur.But it will probably be many years before we can predict earthquakes accurately.And thecontrol of earthquakes is even farther away.Nevertheless, there have been some interesting developments in the field of controlling earthquakes.The most interesting development concerns the Rocky Mountain Arsenal earthquakes.Here water was put into a layer of rocks 4,000 meters below the surface of the ground.Shortly after this injection of water, there was a small number of earthquakes.Scientists have decided that the water which was injected into the rocks worked like oil on each other.When the water"oiled" the fault, the fault became slippery and the energy of an earthquake was released.Scientists are still experimenting at the site of these earthquakes.They have realized that there is a connection between the injection of the water and the earthquake activity.They have suggested that it might be possible to use this knowledge to prevent very big, destructive earthquakes, that is, scientists could inject some kind of fluid like water into faults and change one big earthquake into a number of small, harmless earthquakes.