Development of the ACTIVE system : an Array of Controlled Transientelectromagnetics to Image Volcanic Environment
ACTIVE 系统的开发:用于火山环境成像的受控瞬态电磁阵列
基本信息
- 批准号:12554014
- 负责人:
- 金额:$ 8.51万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This three-year project was carried out to develop an accurate system (ACTIVE) to monitor active volcanoes by a controlled electromagnetic method.In 2000, numerical simulation studies were made to determine the optimal array configuration to monitor the structural change due to volcanic activity of Izu-Oshima. Observation system was designed, such as transmitter circuits, sensitivity of the receiver, and record length, and then prototype instruments (one transmitter and two receivers) were manufactured.In 2001, field test experiment was carried out twice around the Mihara-yama, the central cone of Izu-Oshima volcano. The first experiment was intended to debug the system, while the second experiment aimed to explore 3-D conductivity distribution around the central cone. In addition to these experimental efforts, we developed a scheme to image time changes in the electrical conductivity structure.In 2002, automatic repeated measurement was started in August, 2002, using the transmitter dipole installed last year and five receivers newly installed around the central pit crater. Data acquisition have been repeated once every two days (from 2-3 AM). Time series data are recorded in a PC card that is attached in the receiver. PC cards from all instruments were retrieved once every two months and data processing were adopted to monitor the conductivity charge. Imaging program was also applied to the experimental data but so far no significant change was obtained.Our repeated measurement indicated no significant change, because the activity of Izu-Oshima volcano still remains very low. On the other hand, we re-examined changes i n the apparent resistivity observed before the 1986 summit eruption and found that they can be explained by pre-eruptive migration of magma in the conduit. Further numerical experiments clearly showed that the ACTIVE system would be able to image the magma migration before the 1986 eruption with a high accuracy.
本项目是为了开发利用可控电磁法监测活火山的精确系统(ACTIVE)而实施的,为期三年。2000年,为了确定监测伊豆大岛火山活动引起的结构变化的最佳阵列配置,进行了数值模拟研究。对观测系统进行了发射电路、接收灵敏度、记录长度等设计,制作了1台发射机、2台接收机的样机,并于2001年在伊豆大岛火山中心锥三原山附近进行了2次野外试验。第一个实验是为了调试系统,而第二个实验的目的是探索三维电导率分布周围的中心锥。除了这些实验的努力,我们制定了一个计划,图像的电导率结构的时间变化。2002年,自动重复测量开始于2002年8月,使用发射器偶极子安装在去年和五个接收器新安装在中央坑陨石坑周围。每两天重复一次数据采集(从2-3 AM)。时间序列数据记录在接收器中附带的PC卡中。每两个月检索一次所有仪器的PC卡,并采用数据处理来监测电导率电荷。对实验数据也进行了成像程序处理,但迄今为止没有得到显著的变化。我们的重复测量表明没有显著的变化,因为伊豆大岛火山的活动仍然很低。另一方面,我们重新研究了1986年山顶喷发前观测到的视电阻率的变化,发现它们可以用喷发前岩浆在管道中的迁移来解释。进一步的数值实验清楚地表明,ACTIVE系统将能够以高精度对1986年火山爆发前的岩浆迁移进行成像。
项目成果
期刊论文数量(16)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
H.Utada: "Interpretation of time changes in the apparent resistivity observed prior to the 1986 eruption of Izu-Oshima volcano Japan"J.Volcanol.Geotherm.Res.. (in press)(印刷中). (2003)
H.Utada:“1986 年日本伊豆大岛火山喷发前观察到的视电阻率随时间变化的解释”J.Volcanol.Geotherm.Res..(出版中)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Y.Takahashi, H.Utada: "Monitoring volcanic activity by an array of controlled electromagnetics"J.Geophys.Res.. (submitted). (2003)
Y.Takahashi、H.Utada:“通过一系列受控电磁学监测火山活动”J.Geophys.Res..(已提交)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Y.Takahashi, H.Utada: "Monitoring volcanic activity by an array of controlled electromagnetics"J.Geophys.Res.. (submitted)(印刷中). (2003)
Y.Takahashi、H.Utada:“通过一系列受控电磁学监测火山活动”J.Geophys.Res..(已提交)(印刷中)(2003 年)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Utada, H., H.Shimizu et al.: "Investigation of the mantle conductivity by the Ocean Hemisphere Network Observation"月刊地球. 23. 3-10 (2001)
Utada, H., H.Shimizu 等:“通过海洋半球网络观测对地幔电导率的调查”,地球月刊 23. 3-10 (2001)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
H.Utada: "Interpretation of time changes in the apparent resistivity observed prior to the 1986 eruption of Izu-Oshima volcano, Japan"J.Volcanol.Geotherm.Res.. (in press). (2003)
H.Utada:“1986 年日本伊豆大岛火山喷发前观察到的视电阻率随时间变化的解释”J.Volcanol.Geotherm.Res..(出版中)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
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{{ truncateString('UTADA Hisasi', 18)}}的其他基金
An Experimental study of the Earth's Electric Field
地球电场的实验研究
- 批准号:
14204041 - 财政年份:2002
- 资助金额:
$ 8.51万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
A study on the mantle electrical conductivity structure beneath the eastern edge of continental Asia
亚洲大陆东缘地幔电导结构研究
- 批准号:
12573004 - 财政年份:2000
- 资助金额:
$ 8.51万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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