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Seismotectonic structure of the Western Pacific arcs

西太平洋岛弧的地震构造结构

基本信息

批准号：
06044049
负责人：
SHIMAZAKI Kunihiko
金额：
$ 6.14万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

A new broadband seismic station was installed at Kamensokoye, Northern Kamchatka, Russia. The STS-1 seismographs are installed in an underground seismic vault. The temperature in winter is as low as -50 to -60C,but the temperature in the vault is below but near 0 degree and the three component STS-1 seismographs are in operation.The broadband seismic station at Parapat, Sumatra, Indonesia was upgraded. First a seismic vault was constructed to avoid thermal disturbances caused by sunlight radiation. Long-period large noises found in the previous broadband records at this station cannot be found in the records obtained in a new vault. Also new power units were installed to minimize the interruption of recordings due to electric power stoppage. Secondly digital magnetic tape recording was replaced by optical magnetic disk recording, which proves to be more stable. Further STS-2 instruments were replaced by STS-1 seismographs and the replacement made possible to record seismic motions at longer periods.At Ponpei, Micronesia and Pohang, Korea broadband seismic observation is continuing and good data were collected. At Ponpei, signal cables from the seismic vault to the recording room were replaced and were buried to avoid any meteorological or artificial cutting of cables.Digital waveform data at Ponpei were converted to compressed formatted data and are nearly ready to be open to researchers through the ERIOS system at the Earthquake Research Institute, University of Tokyo. Digital waveform data at Parapat station are available to researchers in Japan and abroad through the ERIOS system. The data were accessed from US and other countries.An analysis of seismic data together with other geophysical data shows that the entire island arc of Indonesia can be divided into three distinct arc regions : West Sunda arc, East Sunda arc and Banda arc. Also large earthquakes along the Kamchatka, Kuril and Japan arcs are analyzed on the basis of pattern of spatial migration.

在俄罗斯堪察加半岛北部的Kamensokoye安装了一个新的宽带地震台站。STS-1地震仪安装在地下地震拱顶中。冬季气温低至-50 ~ -60℃，但库内温度低于但接近0℃，三分量STS-1地震仪在工作。印度尼西亚苏门答腊岛帕拉帕特的宽带地震台站得到了升级。首先，建造了一个地震拱顶，以避免阳光辐射引起的热干扰。在该站以前的宽带记录中发现的长周期大噪声在新库中获得的记录中找不到。此外，还安装了新的动力装置，以尽量减少因电力中断而导致的录音中断。其次，用光盘记录代替数字磁带记录，证明光盘记录更加稳定。后来，STS-2仪器被STS-1地震仪所取代，这使得在更长的周期内记录地震运动成为可能。在蓬佩、密克罗尼西亚和浦项，韩国的宽带地震观测正在继续进行，并收集了良好的数据。在庞贝，从地震拱顶到记录室的信号电缆被更换并埋起来，以避免任何气象或人为切割电缆。庞培的数字波形数据被转换成压缩格式的数据，并几乎准备好通过东京大学地震研究所的ERIOS系统向研究人员开放。Parapat站的数字波形数据可通过ERIOS系统提供给日本和国外的研究人员。这些数据是从美国和其他国家获取的。通过对地震资料和地球物理资料的分析，将印尼整个岛弧划分为西巽他岛弧、东巽他岛弧和班达岛弧三个不同的岛弧区域。根据空间迁移模式对堪察加、千岛群岛和日本等地的大地震进行了分析。