PROPAGATION ANOMALIES IN NORTHWESTERN ITALY BY INVERSION OF TELESEISMIC RESIDUALS

被引：13

作者：

CATTANEO, M

EVA, C

机构：

[1] Department of Earth Sciences, Geophysical Section, University of Genova

来源：

TERRA NOVA | 1990年 / 2卷 / 06期

关键词：

D O I：

10.1111/j.1365-3121.1990.tb00123.x

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Travel-time residuals of teleseismic P waves were analysed in order to elucidate the crust-upper mantle structure in Northwestern Italy, and the Western Alpine Arc. Using digital data obtained from both fixed seismograph networks operating in NW Italy (notably Liguria-Piedmont) and temporary arrays with the aid of cross-correlation techniques reliable travel-time residuals were calculated which were then inverted to obtain models of propagation anomalies. The reliability of the inversion procedure was tested using synthetic data. The model thus obtained appears to be stable and shows strong lateral heterogeneities at a litho-asthenospheric level; in particular, it confirms the high velocity contrast caused by the 'Ivrea Body' in the shallower layers and the presence of Alpine 'roots' reaching down to at least 200 km. A statistical analysis performed on the propagation times of rays crossing the resulting four-layered model reveals rms below 0.1 s.

引用

页码：577 / 584

页数：8

共 24 条

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