HYDROLOGICAL AND GEOCHEMICAL CHANGES RELATED TO THE 1989 SEISMIC AND VOLCANIC ACTIVITIES OFF THE IZU PENINSULA

被引：16

作者：

NOTSU, K

WAKITA, H

IGARASHI, G

SATO, T

机构：

[1] Laboratory for Earthquake Chemistry, Faculty of Science, The University of Tokyo, Tokyo 113, Bunkyo-ku

来源：

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

关键词：

D O I：

10.4294/jpe1952.39.245

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We have monitored water level of a hot spring in Ito City, radon concentration of hot spring water in Naka-Izu and temperature of fumarolic gas from Izu-Oshima Volcano. These parameters have changed prior to and during the seismic and volcanic activities starting on June 30, 1989, off the eastern coast of the Izu Peninsula. We summarized our observations together with other reported hydrological changes. The observed changes are classified into two types. One type is a co-seismic change which occurred at the times of bigger earthquakes among swarm activities. These changes were observed at several hot springs in the area 20-30 km away from the Teisi erupting center. The other type is precursory changes observed in the area close to the erupting center and at the Izu-Oshima Volcano 40 km away. The upward movement of magma due to possibly a dyke intrusion may disturb violently the hydrological systems in Ito City and Usami Town. Precursory changes in temperature of a fumarolic gas emitted from a well in the Izu-Oshima Volcano imply a possible linkage between Izu-Oshima and Teisi magma systems.

引用

页码：245 / 254

页数：10

共 30 条

[1]

Aramaki S., Hamuro K., Geology of the Higashi-Izu monogenetic volcano group, Bull. Earthq. Res. Inst., Univ. Tokyo, 52, pp. 235-278, (1977)

[2]

Endo K., Chiba T., Taniguchi H., Sumita M., Tachikawa S., Miyahara T., Uno R., Miyaji N., Tephrochronological study on the 1986–1987 eruptions of Izu-Oshima volcano, Japan, Bull. Volcanol. Soc. Jpn., Ser. II, 33, pp. S32-S51, (1988)

[3]

Crustal movements in the Izu Peninsula, Rep. Coord. Comm. Earthq. Predict., 43, pp. 227-252, (1990)

[4]

Data presented at the 88th Meeting of Coordinating Committee for Earthquake Prediction, (1989)

[5]

Fluctuations of discharge rate and water temperature of Akazawa well No. 6 at Ito City, eastern Izu Peninsula (-April, 1990), Rep. Coord. Comm. Earthq. Predict., 44, pp. 204-210, (1990)

[6]

Hayakawa Y., Total volume of eruptive products and their eruption rates on the 1986 eruption of Izu-Oshima Volcano, Earth Monthly, 9, pp. 366-371, (1987)

[7]

Hirabayashi J., Present status of researches on disasters caused by volcanic gases and prediction of volcanic eruption by chemical methods, Bull. Volcanol. Soc. Jpn., Ser. II, 30, pp. S327-S338, (1986)

[8]

Hirukawa T., Ando N., Sumi K., Chemical composition of the thermal waters from thirty main Japanese geothermal fields, Rep. Geol. Surv. Jpn., 257, pp. 1-934, (1977)

[9]

Ishida M., Hasemi A.H., Three-dimensional fine velocity structure and hypocentral distribution of earthquakes beneath the Kanto-Tokai district, Japan, J. Geophys. Res., 93, pp. 2076-2094, (1988)

[10]

Ishii H., Recent abnormal uplift on the Izu Peninsula (1980–1988), Bull. Earthq. Res. Inst., Univ. Tokyo, 64, pp. 313-324, (1989)

← 1 2 3 →