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Gravity Survey along the Mizuho Traverse Routes, East Antarctica: SEAL Seismic Exploration in 1999-2000

International Journal of Geosciences 2013年第10期4卷 1392-1400页

作者： Shigeru Toda hiroki miyamachi Hiroshi Murakami Tomoki Tsutsui Masaki Kanao Department of Earth and Environmental Sciences Faculty of Science Kagoshima University Kagoshima Japan Department of Earth Sciences Faculty of Education Aichi University of Education Kariya Japan Faculty of Engineering and Resource Science Akita University Akita Japan National Institute of Polar Research Tokyo Japan Technical Center for Seismological Observations Ltd. Tsukuba Japan

A gravity survey was conducted along the Mizuho traverse routes in austral summer of 1999-2000 by the 41st Japanese Antarctic Research Expedition (JARE-41). The main purpose of the survey was to obtain detail gravity anomaly along the traverse routes, where deep seismic exploration was simultaneously conducted in order to obtain a fine crustal structure of the Mizuho Plateau. By using SCINTREX (CG-3M) gravity meter, the survey was carried out at 160 sites with about 1 km interval in a distance of 190 km from S16 to Z20 on the traverse routes. Free-air and Bouguer anomalies were calculated using precise locations by GPS measurements, by taking into account an effect of the thick icesheet. The furrowed negative Free-air anomalies are identified around H192, where middle points of the whole traverse routes. Two bedrock elevation models derived both by seismic refraction analyses and radio-echo sounding might correspond to the bottom and the top of a mixture layer composed from ice-moraine rocks over the bedrock surface. Thickness of the crust estimated by Bouguer anomalies is 0.5 - 1 km larger toward inland at the terminal point of Z20 along the profile.

关键词： Gravity Survey Mizuho Traverse Routes Bedrock Elevation Bouguer Gravity Anomaly Crustal Structure

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Gravity Survey on the Mizuho Plateau, East Antarctica: SEAL Seismic Exploration in 2001-2002

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International Journal of Geosciences 2014年第2期5卷 146-155页

作者： Shigeru Toda hiroki miyamachi Masaki Kanao Takeshi Matsushima Masamitsu Takada Atsushi Watanabe Mikiya Yamashita Department of Earth and Environmental Sciences Faculty of Science Kagoshima University Kagoshima Japan Department of Earth Sciences Faculty of Education Aichi University of Education Kariya Japan Earthquake Research Institute The University of Tokyo Tokyo Japan Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology Yokohama Japan Institute of Seismology and Volcanology Graduate School of Science Hokkaido University Sapporo Japan National Institute of Polar Research Tokyo Japan Shimabara Observatory Institute of Seismology and Volcanology Faculty of Sciences Kyushu University Shimabara Japan

A gravity survey on Mizuho Plateau was carried out in austral summer of 2001-2002 by the 43rd Japanese Antarctic Research Expedition (JARE-43), as one of the geophysical measurements of deep seismic exploration. Gravity measurements were conducted at 151 points in approximately 1 km interval along the 150 km profile. Considering the gravity effect from the ice-sheet, Free-air and Bouguer anomalies were calculated by using precise GPS locations. Furrowed and basin-like negative Free-air anomalies were observed in middle and northern parts of the profile. Bouguer anomalies were calculated by two bedrock elevation data obtained from seismic refraction and radio-echo sounding. High resolution model for bedrock elevation by radio-echo sounding was applied in determining the crustal thickness.

关键词： Gravity Survey Mizuho Plateau Bedrock Elevation Bouguer Gravity Anomaly Crustal Thickness

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Active seismic monitoring of Earth’s interior using ACROSS, a signal system with highly-accurate permanent seismic sources

Active seismic monitoring of Earth’s interior using ACROSS,...

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2014年中国地球科学联合学术年会——国际专题（2）M...

作者： Toshiki Watanabe Koshun Yamaoka Ryoya Ikuta Takahiro Kunitomo hiroki miyamachi Masato Iguchi ERI Univ. of Tokyo Nagoya Univ. Shizuoka Univ. Kagoshima Univ.

＜正＞*** The Earth’s interior evolves in *** monitoring of subsurface temporal variation phenomena related to earthquakes and volcanic activities is a challenge in both solid earth sciences and hazard *** stands for Accurately Controlled,Routinely Operated Signal System designed to monitor the time-evolving nature of physical properties of the Earth’s interior1,2,*** is based on both a repeated transmission of a controlled,frequency-modulated（FM）signal and a long-term continuous observation synchronized with the *** accurately controlled system enables us to apply a "frequency comb’’ technique in the frequency domain that maximizes the signal-to-noise（S/N）ratio based on stacking of the

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近震资料确定三维地震速度结构的一种方法

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世界地震译丛 1995年第6期26卷 45-49页

作者： H.miyamachi 杨导声浙江省地震局

我们研究了由近震得到的地震走时资料估计地震波速度三维结构的反演方法。这种方法由同时确定速度界面的二维深度分布、三维速度分布、台站校正和震源来表征。速度界面的深度分布和慢度扰动的分布以纬度、经度和深度的幂级数来拟合。这... 详细信息

我们研究了由近震得到的地震走时资料估计地震波速度三维结构的反演方法。这种方法由同时确定速度界面的二维深度分布、三维速度分布、台站校正和震源来表征。速度界面的深度分布和慢度扰动的分布以纬度、经度和深度的幂级数来拟合。这种三维地震结构的表示不仅有助于减少未知参数的个数,也有助于解析地求取界面深度、速度和走时关于未知参数偏导数的值。连接震源和台站之间的射线轨迹,是在具有确切界面深度分布的简化的速度分布条件下由称为试射法的射线追踪方法确定的。数值试验证明,我们的反演方法可成功地估计三维速度结构。

关键词：地震速度近震数据地震波

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