J-array

1987年，国际大地测量学与地球物理学联合会（IUGG）成立了一个地球深部内部研究委员会（SEDI）。它的主要目的是研究地核和下地幔，是地球科学的重要组成部分。世界各地的科学家开始研究地球的核心。在日本，对地核的兴趣也有所增加，1990年，“地核”项目获得了教育、科学、体育和文化部对优先领域科学研究的赠款援助。“J-Array”是该项目的一部分。“J阵列”可以被认为是一个瞄准地球内部的巨型望远镜。这个望远镜的传感器是短周期地震仪。本项目旨在通过台阵观测将背景噪声放大，从而从背景噪声中提取微地震信号。最后一个目标是通过捕捉地震波（P和S）来定义地球内部的精细结构，以了解地球内部的运动和历史 ...更多信息 在这项资助下，继续进行进一步的记录和分析，以增加大地震和不同地区发生的地震的数据库。“J-Array”项目应考虑到数据库的可能应用和未来前景。出版了大地震的地震波形数据汇编。这本书无疑在进一步的学习和教育中起着重要的作用。还出版了载有地震数据库的光盘（SAC格式）。这将是日本对世界地球科学的一大贡献。“J阵列”虽然很大，但与地球的大小相比仍然很小。因此，它能观测到的地球内部的部分也是有限的。为了解决这个问题，必须与其他国家合作。目前世界上已有许多地震观测台网，如加州700点台网、华北100点台网、台湾60点台网、德国的Graefenburg台阵、澳大利亚的Warramunga台阵等。通过与这些网络合作，将有可能从各个角度观察地球内部。这些合作将在下一个“新J阵列项目”中进行。少

In 1987, the International Union of Geodesy and Geophysics (IUGG) formed a committee for Study of the Earth's Deep Interior (SEDI). Its main aim is in studying the Earth' core and the lower mantle, regarding it as an important part of earth science. Scientists around the world began researches on the Earth's core. This interest in the Earth' core also rose in Japan, and in 1990, project "Earth's Core" received the Grants-Aid for Scientific Research on Priority Areas from the Ministry of Education, Science, Sports and Culture. "J-Array" was part of the project."J-Array" can be considered as a giant telescope aimed at the Earth's interior. The sensors for this telescope are short-period seismometers. This project aims to pick up signals of micro-earthquakes from background noise by amplifying it by array observation. The final object is to define the fine structures of the Earth' interior to understand the motions and history of the Earth' interior by catching the seismic waves (P and S … More waves) that were reflected and refracted by various surfaces in the Earth.Under this grant-in-aid, further recordings and analyzes were continued for increasing the database for large earthquakes and earthquakes occurring in different regions. The "J-Array" project should take into consideration the possible applications of the database and future prospects. A compilation of the seismic waveform data for the major earthquakes was published. This book most certainly plays an important role in further studies and education. A CD-ROM containing the seismic database (SAC format) was also published. It will be a big contribution from Japan to earth science in the world.Although the "J-Array" is large, it is still small compared to the size of the Earth. Therefore, the portion of the Earth's interior that can be observed by it is also limited. To overcome this problem, it is necessary to cooperate with other countries. Many seismic observation networks exist in the world today such as the network in California with 700 observation points, the North China network with 100 points, the network of Taiwan with 60 points, the Graefenburg Array of Germany, and the Warramunga Array of Australia. By collaborating with these networks, it will be possible to observe thee Earth's interior from all angles. These collaboration will be conducted in the next "New J-array Project". Less