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| wenchuan 8.0 Magnitude earthquake Acceleration peak Attenuation Curve using Four-area elliptical model |
| yangfan1;luoqifeng2 |
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Abstract At present, equal-distance circle model is generally used for directly fitting acceleration peak attenuation curve. epicentral distance or focal distance is only coordinate statistical parameter of seismic station. For large earthquake with a long faults, the isoseismic curve of equal-distance exist serious deviation from realistic isoseismic curve. There is enormous variations for acceleration peak attenuation curve to longest axis and to shortest axis. Four-area elliptical model in this paper devided seismic station into four area according to longest axis and shortest axis. Every elliptical Acceleration isoseismic in four area is respectively figured out by the way of interpolation referred to seismic intensity isoseismic curve. On the basis of this, Wenchuan earthquake acceleration peak attenuation curve be obtained in two longest semiaxis direction and two shortest semiaxis direction. Comparing results of Wenchuan 8.0 magnitude earthquake acceleration peak Attenuation Curve using circle model and Four-area elliptical model, the latter is more Close to the real situation and get more useful results including reflected hanging and foot wall effect and direction effect of earthquake.
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Received: 30 September 2009
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2010, Vol. 29 
