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利用人工震源实验揭示日本樱岛火山之下结构演变
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作者 tomoki tsutsui Masato Iguchi +2 位作者 Takeshi Tameguri Haruhisa Nakamichi 王林(译) 《国际地震动态》 2018年第10期20-36,共17页
通过人工震源实验,研究地震反射率变化用于监测活火山之下结构演变,认为其与岩浆卸载有关。樱岛火山是日本最活跃的火山之一,也是目前研究的主要目标。每年在火山区域开展人工震源实验,共计完成6期实验。通过对每期实验的数据进行分析,... 通过人工震源实验,研究地震反射率变化用于监测活火山之下结构演变,认为其与岩浆卸载有关。樱岛火山是日本最活跃的火山之一,也是目前研究的主要目标。每年在火山区域开展人工震源实验,共计完成6期实验。通过对每期实验的数据进行分析,获取了两个地震反射剖面。实验清晰地反映出樱岛东北部深度6.2 km处的地震反射率年变化情况。2009年12月首次岩浆入侵时出现最大反射率,随后逐渐下降,直到2013年12月,与樱岛火山膨胀压缩周期相一致。反射率变化发生在地壳深部嵌入的明显反射区内。位于中间层的夹层结构被作为反射区模型。低速岩浆嵌入中间层及其后续波速的增加可用于解释反射率的变化范围。这也解释了地壳深部岩浆喷发与温度下降的关系。该研究描述了一种用于即时获取岩浆特性以及监测活火山的新方法。 展开更多
关键词 安山岩火山 樱岛火山 反射地震学 地壳结构 岩浆运动 监测火山活动
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Gravity Survey along the Mizuho Traverse Routes, East Antarctica: SEAL Seismic Exploration in 1999-2000
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作者 Shigeru Toda Hiroki Miyamachi +2 位作者 Hiroshi Murakami tomoki tsutsui Masaki Kanao 《International Journal of Geosciences》 2013年第10期1392-1400,共9页
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 ... 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. 展开更多
关键词 GRAVITY Survey Mizuho TRAVERSE Routes BEDROCK ELEVATION Bouguer GRAVITY ANOMALY CRUSTAL Structure
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