Evaluation of Potential Hazards related to Seismic Swarms

(1)小组成员收集了与大地震或火山喷发活动有关的震群的基本数据，并对数据文件输入进行了必要的分析。通过这些努力，我们编制了CA。2000年的swarm事件以软盘的格式，并对数据文件进行了概要发布。(2)在东京举行了震群研讨会，研究人员讨论了与震群数据文件有关的个别研究课题。(3)1995年，在纪念世界自然基金会成立50周年国际研讨会上，Showa-Shinzan组，举行了一次特别技术会议，讨论世界地震群。(4)讨论数据文件的出版大纲的未来计划，以及软盘中数据媒体的公开发行计划。(5)我们小组与美国阿拉斯加大学阿拉斯加火山观测站的火山地震学家交流了建立世界火山震群数据档案的信息。我们讨论了未来的计划，为世界范围内的贡献，我们的数据文件。(6)在几个场合，例如在松前地震群，我们的小组成员积极响应社会响应基于我们的新数据文件的援助。这些实例表明了数据文件作为未来应急管理和危险源评估科学背景的重要性和有效性。(7)指出了大规模地震群与地壳显著形变的一般关系，认为无论是地震群还是火山活动，都应从区域地壳共同活动的角度来看待个别现象，而在区域共同应力场的作用下，则应涉及更广泛、更综合的现象。

(1) Basic data collection of earthquake swarms associated with a large earthquake or an eruptive activity of volcanoes was conducted by the group members, and bessesary analyzes for the data file input were performed. By those efforts, we had compiled ca. 2000 swarm events on a floppy disc format, and outline of the data file were published.(2) Earthquake swarm workshop was held in Tokyo, and individual research topics related to the swarm data file were discussed amond research members.(3) At the occasion of the '95 International Workshop commemorating the 50th Anniversary of Mt. Showa-Shinzan Formation, held a special technical session discussing the world earthquake swarms.(4) Discussion for the future plan of publishing outline of the data file and also public release plan of the data media in a floppy disc.(5) Information for establishing the World Data File of Volcanic Earthquake Swarm was exchanged between our group and volcano seismologists at Alaska Volcano Observatory, Alaska University (USA) . We discussed for the future plan for world wide contribution of our data file.(6) At several occasion, for example at Matsumae Earthquake Swarm, our group member responded prompyly for the social responce based on the assistance of our new data file. Those examples indicate the importance and effectiveness of the data file as a scientific background at future emergency manadgement and hazard evaluation.(7) General relation between extensive earthquake swam and notable crustal deformation was noted, and it is concluded that individual phenomena should be treated from the view point of common regional crustal activity related more wide and comprehensive phenomena under curtain common regional stress field, whatever earthquakes swarms or any kinds of volcanic phenomena.