FIXED-POINT GPS OBSERVATION OF CRUSTAL MOVEMENT ASSOCIATED WITH THE 1989 SEISMIC SWARM AND SUBMARINE VOLCANIC ACTIVITIES OFF ITO, CENTRAL JAPAN

被引：6

作者：

FUJINAWA, Y

SHIMADA, S

OHMI, S

SEKIGUCHI, S

EGUCHI, T

OKADA, Y

机构：

[1] National Research Institute for Earth Science and Disaster Prevention

来源：

JOURNAL OF PHYSICS OF THE EARTH | 1991年 / 39卷 / 01期

关键词：

D O I：

10.4294/jpe1952.39.141

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Continuous geodetic baseline measurements using the fixed-point GPS baseline determination network have been undertaken in the Kanto-Tokai district, central Japan. A crustal deformation which was associated with the 1989 seismic swarm and which preceded a volcanic eruption east of the Izu Peninsula was observed. We observed time variations of a 10 km length baseline vector between Hatsushima (HTS) and Ito (ITO) across the swarm area, as well as those of a 40 km length baseline vector between HTS and Shimoda (SMD). It was found that the position of ITO, south of the activity region, moved 8.2 cm southward, 2.5 cm eastward and 8.7 cm upward, and the position of HTS, north of the region, moved 8.6 cm eastward, 5.5 cm northward and 3.3 cm upward, resulting in the baseline extension of 14.5 cm during the period of the active swarm prior to the submarine volcanic eruption. The detected crustal movements were found to be consistent with a proposed fault model.

引用

页码：141 / 153

页数：13

共 24 条

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