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Observations with STS broadband seismographs on the Philippines and the deployment of a Western Pacific global seismograph network

菲律宾 STS 宽带地震仪观测和西太平洋全球地震仪网络的部署

基本信息

批准号：
03041042
负责人：
ANDO Masataka
金额：
$ 5.44万
依托单位：
Disaster Prevention Research Institute, Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

This project intends to install a three-component broad-band wide-dynamic-range seismometer (STS-2) at a station in the Philippines to study deep Earth's interiors and earthquake mechanisms in the Western Pacific region. The sensors and recording system were set up in the 1991 fiscal year and since then have been working at a good condition without any major trouble. The data from the station have been shipped first to Disaster prevention Research Institute (DPRI), Kyoto University, from Philippine Institute of Volcanology and Seismology (PHIVOLCS) for the purpose of edition and analysis at an approximately monthly rate. Then the data are edited and duplicated at DPRI, and the edited disks are shipped back to PHIVOLCS again for the use of research in the PHLIPPINES. The data are digitized and sampled at two rates, one for the continuous recording at 1 Hz and the other for the triggered recording at 41 Hz. About 15 events are detected per month and stored on magneto-optical disks. The most serious problems with the system are two folds : (1) a poor receiving condition of clock signals from OMEGA, and (2) frequent blackouts in the metropolitan area which seems to have started recently. For clarifying these problems people will be dispatches in May to PHIVOLCS.A seismic exploration survey was made in February and March in the Taal volcano area using artificial explosions in two 50-m deep drilling holes. Eight people from DPRI and ten from PHIVOLCS participated for the collaboration tasks for about 2 weeks. 32 EDRs (Event triggered Recorder) were used for the survey. The two shots were exploded at suitable conditions and recoded at all stations. The data are at this moment being analyzed and the results will be brought in three months. It is worthy noting that our exploration survey is the first attempt in the Philippines which used explosives for a geophysical scientific purpose. The experiment have stimulated and promoted our future collaboration.

该项目拟在菲律宾的一个台站安装三分量宽带宽动态范围地震仪（STS-2），以研究地球内部深处和西太平洋地区的地震机制。传感器和记录系统于1991财年安装，自那时起一直运行良好，没有出现任何重大问题。该站的数据首先从菲律宾火山和地震研究所（PHIVOLCS）运送到京都大学防灾研究所（DPRI），以大约每月一次的速度进行编辑和分析。然后，数据在 DPRI 进行编辑和复制，编辑后的磁盘再次运回 PHIVOLCS，供菲律宾的研究使用。数据以两种速率进行数字化和采样，一种用于以 1 Hz 的频率连续记录，另一种用于以 41 Hz 的触发记录。每月检测到约 15 个事件并将其存储在磁光盘上。该系统最严重的问题有两个：（1）OMEGA时钟信号的接收状况不佳；（2）大都市区频繁停电，似乎是最近才开始的。为了澄清这些问题，我们将于5月派遣人员前往PHIVOLCS。2月和3月在塔尔火山地区进行了地震勘探调查，在两个50米深的钻孔中使用人工爆炸。 DPRI 的 8 名人员和 PHIVOLCS 的 10 名人员参与了为期约两周的协作任务。调查使用了 32 个 EDR（事件触发记录器）。这两颗子弹在合适的条件下爆炸，并在所有站点进行了记录。目前正在分析数据，结果将在三个月内得出。值得注意的是，我们的勘探调查是菲律宾首次将炸药用于地球物理科学目的的尝试。这次实验刺激并促进了我们未来的合作。