Posted by admin | Posted in Peru | Posted on 20-06-2011
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HELP SCIENCE QUESTION!?! NO MEAN COMMENTS PLEASE I DON’T KNOW THE ANSWER?
2.An earthquake in Peru was reported on February 10, 2009. Read the following excerpt from a news report:
WASHINGTON: A strong 6.0-magnitude earthquake struck just off the coast of northern Peru on Monday, the U.S. Geological Survey reported. The quake, which shook the South American country at 9:09 am (1409 GMT), was centered 150 kilometers west of the city of Chiclayo, and 160 kilometers southwest of Piura.… The epicenter was at a depth of 10 kilometers, according to the USGS. (www.ChannelNewsAsia.com)
Describe this earthquake using the terms fault, crust, focus, seismic waves, and epicenter.
I found the following information at the source link I posted below.
“As the lithospheric plates of the Earth continue their slow motions, stresses build up in the crust, especially near the plate boundaries. Those stresses (compression, tension, shear) build up in the crust until the stress exceeds the strength of the rock or the friction along a preexisting fault. Then, sudden slippage of rock along a fault occurs. The ground shakes as the stress energy is released and the rocks lurch to their new position in a matter of seconds. Seismic waves travel outward from the portion of the fault that broke, like expanding ripples from a pebble dropped in still water.”
“The whole fault doesn’t move at one time; only the part of the fault around which the stress exceeded the strength. Seismologists can determine the point on a fault where the slippage began, the area (length and depth) of the fault that slipped, the amount of slippage or fault throw (how far the crust moved), and the time it took for the slippage to occur. The focus or hypocenter is the exact position on the fault, including the depth, where the slippage began. The epicenter is the map position of the Earthquake. It lies directly over the focus.”
Peru Earthquake
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