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，我们在台湾中部和沿海山脉附近进行了地震折射构造勘探（SRSES）。自 2004 年以来，研究人员已在 4 个采石场完成了 25 项调查。这些地点总共建立了 298 个站来记录 SRSES 的数据。为了利用预开挖爆破过程中记录的数据来帮助推断地下岩层结构的细节，研究人员编制了两座山脉之间的七个勘测剖面（A-G 线）。该勘测使用了 Mark Products Company 型号 L-22D 地震仪，运行温度为200Hz 的采样率。 Hakusan Industry Datamark LS8000 数字记录仪用于记录来自地震计的数据以及来自 GPS 接收器的信号，精度为 3ms。D 线的波形记录清楚地说明了 P 波的传播，并提供了观测数据距爆炸中心30公里。由于 E 线和 F 线位于沿海范围周围，因此观测线尤为重要。建议继续监测山脉沿海一侧的波形记录以供将来研究。D线的走时图显示在激波点3（SP3）周围表层的传播速度为4.8公里/秒，这也可以通过裸露露头的证据来证实，表层是由大理石组成的。地下层的波传播速度为 6.0 公里/秒。即使在本研究中使用的距离震中 50 公里的最大距离，也没有在第三层观察到折射波。