Measurements of intrinsic and scattering seismic attenuation in the crust
Measurements of intrinsic and scattering seismic attenuation in the crust
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地壳内固有和散射地震衰减的测量
DOI：
10.1785/bssa0850051373
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发表时间：
1995
影响因子：
3
通讯作者：
R. Maresca
中科院分区：
文献类型：
--
作者：
E. Pezzo;J. Ibáñez;J. Morales;A. Akinci;R. Maresca
本征和散射衰减参数，Qi和QS，已被测量在三个不同的构造地区的本地和浅源地震位于接收器附近。Wennerberg（1993）提出的方法考虑了对Zeng的多次散射公式的尾波Q参数的数值修正，用于从尾波Q和直达S波Q的估计值推断本征Q值和散射Q值。1至12 Hz范围的结果表明，埃特纳火山和Campi Flegrei地区的Qi与QS相当，而格拉纳达构造活动区的Qi低于QS。尾波Q值接近于内禀Q值，这表明，至少在地壳中，尾波Q值是内禀Q值的一个很好的估计值。火山区表现出合理的较高程度的异质性，如果与格拉纳达的非火山区相比。
Intrinsic and scattering attenuation parameters, Qi and QS, have been measured in three different tectonic areas for local and shallow earthquakes located close to the receiver. The approach developed by Wennerberg (1993), which takes into account the numerical correction of the coda-Q parameter for the multiple scattering formulation of Zeng, was used to infer from the estimates of coda Q and direct S-wave Q the intrinsic (Qi) and scattering (QS) Q values. Results for 1 to 12 Hz range show that Qi is comparable to QS for the Etna volcano and for the Campi Flegrei area, while Qi for the tectonically active area of Granada is lower than QS. Coda Q is close to intrinsic Q, suggesting that, at least in the crust, coda Q is a good estimate of the intrinsic Q. Volcanic areas show a reasonable higher degree of heterogeneity, if compared with the nonvolcanic area of Granada.