Consideration of seismic tectonics around southern region of Nansei-shoto Islands by Japan-Taiwan Collaborative research-Regional features of subduction zone-

日台合作研究对南西小岛南部地区地震构造的思考-俯冲带的区域特征-

基本信息

批准号：
16540390
负责人：
BABA Hisatoshi
金额：
$ 2.05万
依托单位：
TOKAI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

In this study, we carried out Seismic Refraction Structural Exploration Survey (SRSES) in the vicinity of Taiwan's Central and Coastal mountain ranges. Since 2004, researchers have completed 25 surveys at 4 quarried locations. These locations have a total of 298 stations established to log data for the SRSES. To aid in inferring details of underground rock formation structure using data logged during pre-excavation blasting, researchers have compiled seven survey profiles (lines A-G) between the two mountain ranges.The survey uses the Mark Products Company model L-22D seismometer, operating at a sampling rate of 200Hz. A Hakusan Industry Datamark LS8000 digital recorder is used for logging data from both the seismometer as well as signals from a GPS receiver at a precision of 3ms.The wave form records of line D clearly illustrate the propagation of P-waves and provide observation data up to 30km from the blast epicenter. Observed lines E and F are particularly important due to their locations surrounding the Coastal range. It is suggested that the wave form records on the coastal-side of the mountains be continually monitored for future study.The travel time plot of line D shows a propagation speed of 4.8km/sec on the surface layer around shock point 3 (SP3), which can also be verified by evidence of exposed outcrops that the surface layer is composed of marble. The subsurface layer exhibits a wave propagation speed of 6.0km/sec. Refraction waves are not observed in the third layer, even at the maximum distance used in this study of 50km from the epicenter.

在这项研究中，我们在台湾中央和沿海山脉附近进行了地震折射结构勘探调查（SRSES）。自2004年以来，研究人员在4个采石场完成了25次调查。这些位置总共建立了298个站点，以记录SRSES的数据。为了使用在爆炸前爆破过程中记录的数据来推断地下岩石形成结构的细节，研究人员在两个山区之间编制了七个调查概况（线A-G）。该调查使用Mark Products Company Company Model L-22D Seismometer，以200Hz的采样速率运行。 Hakusan行业Datamark LS8000数字记录器用于以3M的精度从地震计和GPS接收器的信号记录数据。线D的波形记录清楚地说明了P-Waves的传播，并提供了来自Blast Epicenter高达30km的观察数据。观察到的线E和F由于其沿海范围围绕的位置而尤其重要。建议将山脉沿海地部的波形记录不断监测以进行未来的研究。D行的旅行时间图显示了冲击点3（SP3）周围的地面层的4.8 km/sec的传播速度，也可以通过暴露的露头的证据来验证，这些证据表明表面层是大理石的表面层组成的。地下层的波传播速度为6.0 km/sec。即使在本研究中使用的50公里距离震中的最大距离处，也不会在第三层观察到折射波。