3-DIMENSIONAL UPSILON (P), AND UPSILON (P)/UPSILON (S) STRUCTURE OF THE HENGILL TRIPLE JUNCTION AND GEOTHERMAL AREA, ICELAND, AND THE REPEATABILITY OF TOMOGRAPHIC INVERSION

被引：41

作者：

FOULGER, GR ^{[1
]}

MILLER, AD ^{[1
]}

JULIAN, BR ^{[1
]}

EVANS, JR ^{[1
]}

机构：

[1] US GEOL SURVEY,SEISMOL BRANCH,MENLO PK,CA 94025

来源：

GEOPHYSICAL RESEARCH LETTERS | 1995年 / 22卷 / 10期

关键词：

D O I：

10.1029/94GL03387

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We investigate the crustal structure of the Hengill triple junction in southwestern Iceland, ap plying tomographic methods to local earthquake data recorded in two held experiments with different network geometries and instrumentation. Data from the two experiments enable us to derive three-dimensional models of the compressional-wave speed v(p), and the wave-speed ratio v(p)/v(s). Well resolved high-v(p) bodies correlate,with sites of gabbroic intrusions. A small reduction in v(p)/v(s) associated with the high-temperature part of the geothermal area is probably due to mineral alteration or supercritical fluids. The RMS difference between the two v(p) models, about 0.26 km s(-1), indicates the approximate repeatability that may de expected of good tomographic inversions.

引用

页码：1309 / 1312

页数：4

共 15 条

[1] VP/VS RATIOS IN THE YELLOWSTONE-NATIONAL-PARK REGION, WYOMING [J].