Interpretation of gravity and gamma-ray spectrometry data in low temperature hydrothermal systems, southeastern part of Fukuoka, Japan

Research output: Contribution to journalArticle

Abstract

The Hakata hot springs area is located in Fukuoka City, which is in the southwestern part of Japan. Gamma-ray and gravity surveys were conducted to understand the relationship between the low-temperature hydrothermal systems and geophysical data of the area. The depth of the reservoir basement, which was derived from gravity data, gradually deepens toward the east; it includes some steep depth gradients in the Hakata hot springs area. High intensities of gamma-rays were detected around these gradients. In addition, higher hot spring temperatures and flow rates can be observed in this area. These results indicate that some part of the level of the basement where the hot springs are concentrated is a part of the Kego Fault and is similar to the fracture zone created by past activities of the fault. Moreover, these steep depth gradients act as a path for hot spring water from the deeper side of the granitic body to the surface.

Original languageEnglish
Pages (from-to)2289-2304
Number of pages16
JournalActa Geophysica
Volume64
Issue number6
DOIs
Publication statusPublished - Dec 1 2016

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gamma ray spectrometry
hydrothermal systems
thermal spring
hydrothermal system
Japan
gamma rays
gravity
gravitation
basements
gradients
spectroscopy
springs (water)
gravity survey
spring water
fracture zone
flow velocity
temperature

All Science Journal Classification (ASJC) codes

  • Geophysics

Cite this

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abstract = "The Hakata hot springs area is located in Fukuoka City, which is in the southwestern part of Japan. Gamma-ray and gravity surveys were conducted to understand the relationship between the low-temperature hydrothermal systems and geophysical data of the area. The depth of the reservoir basement, which was derived from gravity data, gradually deepens toward the east; it includes some steep depth gradients in the Hakata hot springs area. High intensities of gamma-rays were detected around these gradients. In addition, higher hot spring temperatures and flow rates can be observed in this area. These results indicate that some part of the level of the basement where the hot springs are concentrated is a part of the Kego Fault and is similar to the fracture zone created by past activities of the fault. Moreover, these steep depth gradients act as a path for hot spring water from the deeper side of the granitic body to the surface.",
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