On the Seismic Prospecting in the Southwestern Part of the Tokyo Metropolitan Area (3): Analyses of Explosion Data in 1983 and 1984@@@1983, 1984年に実施された人工地震のデータの総合的解析
On the Seismic Prospecting in the Southwestern Part of the Tokyo Metropolitan Area (3): Analyses of Explosion Data in 1983 and 1984@@@1983, 1984年に実施された人工地震のデータの総合的解析
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东京都西南地区地震勘探（三）：1983年、1984年爆炸资料分析@@@1983年、1984年人工地震资料综合分析
DOI：
10.4294/zisin1948.41.4_527
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
M. Yanagisawa
中科院分区：
文献类型：
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作者：
Hiroaki Yamanaka;Kazuoh Seo;Takanori Samano;Saburoh Midorikawa;E. Shima;M. Yanagisawa
在关东平原西南部的一些临时观测站观测到了9个地点爆炸产生的地震波。对多条测线进行了沿着行程时间分析，使测线交叉点处的矛盾尽可能小。对沿线沿着的地下结构进行了研究，以揭示该地区的三维特征。结果表明：（1）该构造由四层组成，纵波速度分别为1.8、2.8、4.8和5.5km/s。然而，在梦之岛爆炸现场周围，4.8km/ s层的厚度似乎很薄。2)4.8km/s层的深度在横滨附近最大，超过4km。在所考虑区域的中部，如冈津和平冢，该层的厚度超过3 km。然而，在黑川和东大岛爆炸地点附近，它变得更浅。3)在立川断层向东京湾地区的东南延线上，沿沿着的几条测线，在5.5km/s层的顶部发现了一个台阶状构造。在阶状构造的西南侧，5.5km/s层的深度超过几公里，该层存在于关东山脉的地表附近。
Seismic waves from explosions at nine sites were observed at a number of temporary stations in the southwestern Kanto plain. Travel time analyses were carried out along the several surveying lines, so that the contradiction at cross points of the lines becomes as small as possible. Underground structures along the surveying lines were studied to reveal the three dimensional features of the region. The results are summarized as follows: 1) The structure consists of four layers which have P-wave velocities of 1.8, 2.8, 4.8 and 5.5 km/s, respectively. Around the Yumenoshima explosion site, however, the thickness of the 4.8km/ s layer seems to be very thin. 2) The depth to the 4.8km/s layer becomes largest around Yokohama as more than 4km. The thickness of this layer is more than 3km in the central part of the area considered, such as Okazu and Hiratsuka. However, it becomes shallower near the Kurokawa and Higashi-ohgishima explosion sites. 3) A step-like structure was found on the top of the 5.5km/s layer at points along the several surveying lines in the southeastern extension of the Tachikawa fault toward the Tokyo Bay area. On the southwestern side of the step-like structure, the depth to the 5.5km/s layer is more than several kilometers and this layer exists near the ground surface of the Kanto Mountains.