CHEMICAL COMPOSITION OF DEEP FAULT FLUID AND EARTHQUAKE SOURCE FAULT

深部断层流体化学成分及震源断层

• 批准号: 11640413
• 负责人: TSUKAHARA Hiroaki
• 金额: $ 2.3万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640413/
• 关键词: EARTHQUAKE GROUNDWATER; EARTHQUAKE CHEMISTRY; MATSUSHIRO SWARM EARTHQUAKE; NAGANOKENSEIBU EARTHQUAKE; SPA GEOCHEMISTRY; FAULT GROUNDWATER CHEMISTRY; 断層地下水

( 1 ) Upwelling waters in the Matsushiro earthquake swarm area are analized chemically and isotopically. The composition of the deep groundwater causing the earthqakes is estimated to be 310 meq/l for Na ion and 330 meq/l for Cl ion.( 2 ) Chemical analysis for the hot springs in the Suwa Spa area along Itoigawa-Shizuoka Tectonic Line reveals that the ratios Na ion to Cl ion concentrations of all springs are almost the same. This indicates that the source of the individual many spring waters is the same deep hot groundwater.( 3 ) Chemical composition of the water from the springs in the Naganokenseibu Earthquake area does not show the location of the earthquake fault. However, the concentration of SO_4 ion indicates the distance of the springs from the volcano, Ontake.( 4 ) The ion concentrations of the hot water from Kurasitanoyu situated along Itoigawa-Shizuoka Tectonic Line are decreasing this year, 2000. Temperature is also decreasing. The reason has not revealed yet. The teasurments now continue.

（1）对松岛震群区的上升沃茨进行了化学和同位素分析。引起地震的深层地下水的成分估计为Na离子310 meq/l和Cl离子330 meq/l。（2）对沿着丝井川-静冈构造线的Suwa温泉区的温泉进行了化学分析，结果表明，所有温泉的Na离子与Cl离子浓度比值基本相同。这表明，个别多泉沃茨的水源是同一深层热水。（3）长野县西部震区泉水的化学成分没有显示地震断层的位置。然而，SO_4离子的浓度指示了泉水与Ontake火山的距离。（4）2000年沿着丝井川-静冈构造线的仓谷汤热水离子浓度呈下降趋势。温度也在下降。原因还没有透露。现在的诱惑还在继续。

项目成果

奥澤 保, 塚原弘昭: "松代群発地震地域に湧出する深層地下水"地震. 53. 241-253 (2001)

奥泽保、冢原宏明：“松代地震群地区深层地下水涌出”地震。53. 241-253 (2001)

OKUSAWA,TAMOTSU, TSUKAHARA,HIROAKI: "Temporal variation in chemical composition of ground water from the Matsushiro Earthquake Swarm area at an earthquake ( in Japanese with English abstract )"J. Balneological Society of Japan. 52 (in press). (2002)

OKUSAWA、TAMOTSU、TSUKAHARA、HIROAKI：“地震时松代地震群地区地下水化学成分的时间变化（日文，英文摘要）”J.