Relation Between the Regional Tilt Change and Results Obtained by the Tiltmeter Near Omaezaki

区域倾斜变化与御前崎附近倾斜仪测量结果的关系

• 批准号: 01540330
• 负责人: SATOMURA Mikio
• 金额: $ 0.7万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540330/
• 关键词: Crustal Movements; Omaezaki; Sagara; Tiltmeter; Active Folding; Leveling Survey; Tilt Change; Bouguer Anomaly

It has been pointed out that a destructive earthquake will occur in the near future in the Tokai District, central Japan, by the convergent motion between the Phillippine Sea Plate and the Eurasian Plate. In order to detect precursory crustal movements of the earthquake, a long baseline (365m) water-tube tiltmeter was set in March 1983 at Sagara,which is the central part of the source region of the presumed earthquake. The direction of water-tube is N60^ﾟ W, Which is the direction of the convergent motion of the Philippine Sea Plate.The results obtained by the tiltmeter had clear seasonal variations, which was affected by rainfall and temperature. The results corrected, showed that the ground was consistently tilting to the northwest at the rate of about 1 nurad/year. This direction is reverse to that of the regional tilting change obtained from the leveling survey.In order to investigate the details and mechanisms of the reverse change, we carried out leveling surveys and gravity measurements in the area around the tiltmeter site.The results of the leveling surveys and the gravity measurements show that the northwest tilting observed by the tiltmeter is possibly caused by a local folding, while the regional tilt change is caused by the plate motion.

有人指出，由于菲律宾海板块和欧亚板块之间的会聚运动，日本中部东海地区近期将发生破坏性地震。为了探测地震的前兆地壳运动，1983年3月在萨加拉设置了一台长基线(365米)水管倾斜仪，这是推测地震震源区的中心部分。水管的方向为N60ﾟW，这是菲律宾海平面辐合运动的方向。倾斜仪测得的结果具有明显的季节变化，受降水和温度的影响。修正后的结果表明，地面一直以每年约1诺德的速度向西北倾斜。为了探讨这种反向变化的细节和机制，我们在倾斜仪场地周围地区进行了水准测量和重力测量。水准测量和重力测量的结果表明，倾斜仪观测到的北西向倾斜可能是由局部褶皱引起的，而区域倾斜变化是由板块运动引起的。

项目成果

Mikiko SATOMURA et al.: "Relation between the results obtained by the waterーtube tiltmeter at Sagara and the regional tilt change around the tiltmeter site." Geoscience Reports of Shizuoka University. 17.

Mikiko SATOMURA 等人：“相良水管倾斜仪获得的结果与静冈大学地球科学报告17 的区域倾斜变化之间的关系。”

Mikiko SATOMURA et al: "Observation of crustal movements by means of a long baseline waterーtube tiltmeter at Sagara, Shizuoka, Japan." International Association of Geodesy Symposia 101. Global and Regional Geodynamics. 329-336 (1990)

Mikiko SATOMURA 等人：“通过日本静冈相良市的长基线水管倾斜仪观测地壳运动。”国际大地测量协会研讨会 101。全球和区域地球动力学 329-336 (1990)。

Mikiko SATOMURA et al.: "Observation of differential Global Positioning System in the central and western parts of Shizuoka Prefecture." Proceedings of the Japanese Symposium on GPS (1989). 79-84 (1990)

Mikiko SATOMURA等：“静冈县中西部地区差分全球定位系统的观测”。

M.Satomura,S.Kobayashi,H.Hasegawa,T.Toyama,T.Danbara,R.Shichi,M.Ino,T.Iwata: "Observation of crustal movements by means of a long baseline waterーtube・tiltmeter at Sagara,Shizuoka,Japan" International Association of Geodegy Symposia.101.Global and Regional

M.Satomura、S.Kobayashi、H.Hasekawa、T.Toyama、T.Danbara、R.Shichi、M.Ino、T.Iwata：“通过相良的长基线水管·倾斜仪观测地壳运动,日本静冈”国际大地测量学会研讨会.101.全球和区域

里村 幹夫,中野 進,伊藤 忠士,井野 盛夫,岩田 孝仁: "静岡県相良町および静岡市上坂における傾斜連続観測(VII)" 地震予知連絡会会報. 45. 327-330 (1991)

Mikio Satomura、Susumu Nakano、Tadashi Ito、Morio Ino、Takahito Iwata：“静冈县相良町和静冈市上坂的连续斜坡观测（VII）”地震预报协调委员会公报 45. 327-330（1991）。