Seismic reflection/refraction study beneath the Median to the Butsuzo Tectonic Lines

中线至佛藏构造线下方的地震反射/折射研究

基本信息

批准号：
09304047
负责人：
ITO Tanio
金额：
$ 23.94万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09304047/
关键词：
Seismic reflection Seismic refraction Deep-seated reflector Butsuzo Tectonic Line Median Tectonic Line Kii Peninsula 付加体

项目摘要

The seismic reflection I refraction study was made along two lines A and B from the Sambagawa through the Chichibu to the Shimanto belts across the Butsuzo Tectonic Line in the western Wakayama, Kii peninsula, , where the typical structural zonation occurs in the Outer Zone of southwest Japan. The total length of the seismic lines is 21 km. The main specifications are as follows : Receiving point (RP) interval = 50 m, Total number of RP = 422, Channel = 280, Receivers = 9/1RP, Source = 3 Vibroseises, Shot point (SP) interval = 200 m, Total number of RP = 422, Sweep length = 16.0 sec., Number of sweep = 30, Sweep frequency = 6 40 Hz, Recorder = G-DAPS 4, Sampling rate = 4.0 msec., Recording length = 20.0 sec. Although the seismic lines run on rugged topography that is common in Japan, the seismic data set is excellent in quality. The preliminary brute stack sections exhibit two major horizontal / subhorizontal reflectors of TWT 2.5 and 4.5 sec. The 2.5 sec. reflector may correspond to the basal part of the Butsuzo Tectonic Line which thrusts the Chichibu belt over the Cretaceous beds in the Shimanto belt, whereas the 4.5 sec. to that of the Gobo-Hagi tectonic Line which which thrusts the Cretaceous over the Paleogene beds in the Shimanto belt. As the common depth points, however, concentrate insufficiently along and around the stacking lines, the. seismic profiles are not so high in quality. The further improvement of data processing is required.

地震反射I折射研究是在两条A和B线上从Sambagawa穿过Chichibu的两条线A和B进行的日本。地震线的总长度为21公里。主要规格如下：接收点（RP）间隔= 50 m，RP = 422，通道= 280，接收器= 9/1RP，源= 3振动，射击点（SP）间隔= 200 m，总数RP = 422的数量，扫描长度= 16.0秒，扫描数= 30，扫描频率= 6 40 Hz，recorder = g-Daps 4，采样率= 4.0毫秒。，记录长度= 20.0秒。尽管地震线在日本常见的崎toporge上延伸，但地震数据集的质量非常好。初步的野蛮堆栈部分展示了TWT 2.5和4.5秒的两个主要水平 /亚侧面反射器。 2.5秒反射器可能对应于Butsuzo构造线的基础部分，该线将Chichibu带推在Shimanto带的白垩纪床上，而4.5秒。对于go-hagi构造线条，它将白垩纪的shimanto床上的古生床推向了shimanto腰带。然而，作为常见的深度，沿着堆叠线的浓度不足。地震曲线的质量不高。需要进一步改进数据处理。