SEISMOTECTONIC STUDY OF THE FRIULI (ITALY) AREA BASED ON TOMOGRAPHIC INVERSION AND GEOPHYSICAL-DATA

被引：10

作者：

BRESSAN, G ^{[1
]}

DEFRANCO, R ^{[1
]}

GENTILE, F ^{[1
]}

机构：

[1] CNR,IST GEOFIS LITOSFERA,I-20133 MILAN,ITALY

来源：

TECTONOPHYSICS | 1992年 / 207卷 / 3-4期

关键词：

D O I：

10.1016/0040-1951(92)90397-O

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The upper crustal structure of the Friuli area involved in the seismic sequence which started on May 6, 1976 (main shock M(L) = 6.4) is investigated, together with the distribution of seismicity, in order to define the main seismotectonic features. Three-dimensional P-velocity modelling is obtained by tomographic techniques using local earthquakes recorded by the seismic network of the Osservatorio Geofisico Sperimentale. Lateral velocity variations and velocity inversions are related to structural heterogeneities. The shortened and thrusted sedimentary cover is detached from the basement; the 3-D velocity structure shows a southward verging, thrusted wedge basement below 5 km depth. Analysis of the distribution of earthquakes, together with three-dimensional velocity modelling, shows that active faulting is represented by north-dipping thrusts uplifting the basement wedge. This high-velocity block forms the main seismogenic zone.

引用

页码：383 / 400

页数：18

共 23 条

[1] ACTIVE TECTONICS OF THE ADRIATIC REGION [J].

ANDERSON, H ;

JACKSON, J .

GEOPHYSICAL JOURNAL OF THE ROYAL ASTRONOMICAL SOCIETY, 1987, 91 (03) :937-983

[2]

BARBANO MS, 1985, J GEOPHYS-Z GEOPHYS, V58, P175

[3]

CASTELLARIN A, 1979, REND SOC GEOL ITAL, V2, P55

[4]

Cati A, 1987, MEM SOC GEOL ITAL, V40, P273

[5]

CAVALLIN A, 1982, GEOL SOC ITAL BOLOGN, P1

[6]

CIPAR J, 1976, B SEISMOL SOC AM, V70, P963

[7] EOALPINE AND MESOALPINE TECTONICS IN THE SOUTHERN ALPS [J].

DOGLIONI, C ;

BOSELLINI, A .

GEOLOGISCHE RUNDSCHAU, 1987, 76 (03) :735-754

[8]

EBERHARTPHILLIPS D, 1986, B SEISMOL SOC AM, V76, P1025

[9]

FRASCARI F, 1978, REND SOC GEOL ITAL, V1, P15

[10]

FRASCARI F, 1979, REND SOC GEOL ITAL, V2, P17

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