Broad band seismological observation in the USSR Far East and Indonesia

这项研究是在1990和1991财政年度(1990年4月至1992年3月)期间进行的，目的是在苏联的Yuzhno-Sakhalinsk(YSS)和印度尼西亚苏门答腊岛的普拉帕特安装宽带高动态范围地震仪。(注：在本研究过程中，苏联的正式名称改为俄罗斯，但本报告使用的是以前的名称。)尽管在研究过程中发生了一些变化，但基本上成功地执行了原计划。上述两个台站的安装是安装波塞冬(太平洋东方地震数字观测)网络的第一步之一。由于这一网络尚未获得正式批准，我们目前将其称为“Pre-Poseidon”网络。根据这笔赠款获得的数据被存档在东京大学地震研究所波塞冬之前的数据中心，在那里它们都是公开的。海神号项目是由日本研究人员…提出的更多是在1987年，并于1988年在东京举行的一次国际会议上得到了潜在主办国的热烈支持。Pre-Poseidon项目目前涉及在印度尼西亚、苏联、韩国和菲律宾安装或肯定计划安装的空间站。这些空间站的资金是由日本政府为科学研究提供的赠款和其他赠款提供的。我们在这笔赠款下的活动细节如下：印度尼西亚：帕拉帕特的空间站是日本方面和印度尼西亚气象和地球物理机构(BMG)的合作努力。在1990财政年度，对帕拉帕特遗址进行了初步调查。1991年10月17日至25日，安装小组(Geller、Suetsugu、Gunawan)前往普拉帕特安装台站；主要部件是STS-2地震仪和用于记录数据的NEC FC-9801 PC。安装已成功完成。地震仪运行情况令人满意，BMG每月都会向日本发送数据。然而，仍有几项任务有待完成。(1)需要采取更好的措施使地震仪免受日常热波动的影响，以降低背景噪声水平。(2)必须纠正数据记录系统中的软件问题。(3)如果资金充足，应对A/D转换器进行升级。苏联：YSS站是日方、苏联科学院海洋地质与地球物理研究所(IMGG)和美国地质调查局(USGS)的合作成果。当我们最初的建议提交时，美国地质勘探局已同意向日方提供宽带设备，然后由日方在YSS安装。然而，应美国地质勘探局的要求，这一计划被更改为以下内容。USGS将在YSS安装宽带站，然后作为苏联、USGS和日本方面的三方合作努力运营。YSS站的数据将由苏联方面直接发送到日本和美国地质调查局。Geller和Moriya于1991年8月访问了YSS，并会见了IMGG和USGS的代表进行了现场勘察，并签署了一份备忘录，确认了上述安排。在编写本报告时(1992年3月中旬)，我们已确认该站将在1992年3月底之前安装在扬子江车站。较少

The purpose of this research, which was carried out during the 1990 and 1991 fiscal years (April 1990-March 1992) was to install broadband high dynamic range seismographs at Yuzhno-Sakhalinsk (YSS) in the USSR and Prapat, Sumatra, Indonesia. (Note : During the course of this research the official name of the USSR was changed to Russia, but the former name is used in this report.) Despite some changes during the course of the research, basically the original plan was successfully carried out. The installation of the above two stations is one of the first steps in installing the POSEIDON (Pacific Orient SEIsmic Digital Observation) Network. As this network has not yet been officially approved, we are currently referring to this as the "pre-POSEIDON" network. The data acquired under this grant are being archived in the pre-POSEIDON Data Center, Earthquake Research Institute, Tokyo University, where they are all publicly accessible.The POSEIDON Project was proposed by Japanese researchers … More in 1987, and was, enthusiastically endorsed by prospective host countries in 1988 at an international conference held in Tokyo. The pre-POSEIDON project currently involves stations installed or definitely scheduled to be installed in Indonesia, the USSR, Korea, and the Philippines. Funds for these stations are being provided by this and other grants-inaid for scientific research from the Japanese government. Details of our activities under this grant are as follows.Indonesia : The station at Prapat is a cooperative effort of the Japan side and the Indonesian Meteorological and Geophysical Agency (BMG). A preliminary survey of the Prapat site was carried out during the 1990 fiscal year. From Oct. 17-25, 1991, the installation team (Geller, Suetsugu, Gunawan) traveled to Prapat to install the station ; the main components are the STS-2 seismometer and the NEC FC-9801 PC used for recording the data. The installation was successfully completed. The seismometer is operating satisfactorily, and data are being sent every month to Japan by the BMG. However, several tasks remain. (1) Better measures to insulate the seismometer from daily heat fluctuations are required to reduce the background noise level. (2) Software problems in the data logging system must be corrected. (3) If funds are available, the A/D converters should be upgraded.USSR : The station at YSS is a cooperative effort between the Japan side, the Institute of Marine Geology and Geophysics (IMGG) of the USSR Academy of Sciences, and the U. S. Geological Survey (USGS). When our original proposal was submitted, the USGS had agreed to furnish to the Japan side broadband equipment which would then be installed by the Japan side at YSS. However, at the request of the USGS, this plan was changed to the following. The USGS would install the broadband station at YSS, and this would then be operated as a three-way cooperative effort by the USSR, USGS, and the Japan side. The data from the YSS station will be sent directly to Japan and the USGS by the USSR side. Geller and Moriya visited YSS in August, 1991 and met with IMGG and USGS representatives for a site survey and to sign a memo confirming the above arrangement. At the time of this report (mid-March, 1992), we have confirmed that the station will be installed at YSS by the end of March, 1992. Less