Trans Korean Peninsula-Japanese Islands Seismic Observation

横贯朝鲜半岛-日本列岛地震观测

• 批准号: 02041044
• 负责人: OIKE Kazuo
• 金额: $ 8.96万
• 依托单位: Faculty of Science, 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: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02041044/
• 关键词: Korea Peninsula; Seismicity; Active Fault; Broad-band Seismograph; Pohang Seismic Station; Microearthquake; Yansan Fault; 日本列島; 梁山断層; 地震観測; Yansan fault; 日本海; 地球内部構造

1.Seismological Nature in and around Korea Four plates are converging in East Asia where there are many large active faults and tectonic belts which generate large earthquakes. Recent seismicity in the Korea region is very low but historical records of Korean peninsula show that there occurred many large earthquakes including some disastrous ones. There are many fault systems in Korea peninsula. We must study that there are some active faults omong them or not.2.Purposes and plannings of project One of main purposes of this project is to establish a permanent seismic observation station of very broad band seismograph in Pohang. Another one is to observe microearthquake activity-in the Yansan fault region. In the second purpose we aimed to know the seismic activity in the region. to get some records of distant earthquakes and to get some records of deep earthquakes. By such observations we can analyze structures of the crust and upper mantle in the region and can study the crustal stres … More s state in the Korea region. Then we can compile these data with those in the other wide regions in East Asia.3.Results and further problems From very broad band seismic records at Pohang we have analyzed Reiley waves to determine the dispersion characteristics of group velocity. The results show that there is a low velocity region in the upper mantle beneath the Ryukyu basin. This result is an example showing that the Pohang station is an important station for seismology in East Asia.Temporary observation network of high sensitive seismometers for the study of microearthquakes was made in the Yansan fault region from 7th July 1993 to 20th August 1993. This observation was the second joint observation in the region. We have gotten many kinds of records by these observations. Several natural earthquakes in the Yansan fault region and many artificial explosions were recorded. This means that Yansan fault system is active fault which can generate big earthquakes in the future.Some large events in Japan with magnitudes larger than six could be recorded by the network. We are now analyzing the velocity structure using such records.Geomorphological study has also been done in the Yansan fault region. We have made a trench across the fault and discovered the clear evidenses indicating that there occurred holizontal dislocations along the fault during last 200 to 300 thousands years. The Yansan fault is the first active fault in Korea of which we found the clear evidences.It is necessary to establish permanent seismograph network to study the detailed natures of the seismic activity of this fault. And it is necessary to make geomorphological surveys in various regions along the fault to study the reccurrence time and slip rate of the fault. They are very important for the long term prediction of earthquakes in the region. Less

1.韩国及周边地区的地震性质东亚四个板块正在交汇，存在许多大型活动断层和构造带，会引发大地震。朝鲜半岛地区近期地震活动很低，但朝鲜半岛半岛的历史记录表明，该地区曾发生过多次大地震，其中不乏灾害性地震。朝鲜半岛断裂系统发育。2.项目的目的和规划本项目的主要目的之一是在浦项建立一个永久性的甚宽频带地震观测站。二是燕山断裂带的微震活动观测。第二个目的是了解该地区的地震活动。来获得一些远距离地震和深源地震的记录。通过这些观测，可以分析该区的地壳上地幔结构，研究地壳应力 ...更多信息 在韩国地区。3.结果和进一步的问题从浦项的甚宽频带地震记录中，我们分析了瑞利波，确定了群速度的频散特征。结果表明，琉球盆地下的上地幔存在一个低速区。1993年7月7日至8月20日，在燕山断裂带建立了高灵敏度地震仪临时观测网，用于研究微震。这是在该区域进行的第二次联合观察。通过这些观测，我们得到了多种记录。在燕山断裂带记录了几次天然地震和许多人工爆炸。这意味着燕山断裂系统是一条未来可能发生大地震的活动断裂，日本的一些6级以上的大地震可以被台网记录下来。我们正在利用这些记录分析速度结构，并在燕山断裂区进行地貌研究。我们在该断裂上做了一个探槽，发现了沿着该断裂二、三十万年来发生过霍氏位错的明显证据。燕山断层是朝鲜境内第一条有明确活动证据的活动断层，有必要建立永久性地震台网来研究该断层的地震活动性。因此，有必要对断层沿线沿着进行地貌调查，研究断层的重现时间和滑动速率。它们对该地区地震的长期预报是非常重要的。少

项目成果

K, Oike et al.: "Seismicity in Korea" Earthquakes and Active Faults in the Yangsan Fault Region in the Sothern Pard of Korea. (1993)

K, Oike 等：“韩国的地震活动”，韩国南部梁山断层区的地震和活动断层。

尾池 和夫ほか: "朝鮮半島の地震活動" 韓国南部梁山断層地域の地震と活断層. (1993)

Kazuo Oike 等：“朝鲜半岛的地震活动”韩国南部梁山断层区的地震和活动断层（1993）。

尾池 和夫: "自然災害科学のための国際協力ー日本の役割ー" 国際協力研究. 6. 13-24 (1990)

Kazuo Oike：“自然灾害科学的国际合作——日本的作用”国际合作研究。6. 13-24 (1990)。

岡田 篤正ほか: "梁山断層(韓国東南部)に伴う活断層 変位地形と断層露頭" 韓国南部梁山断層地域の地震と活断層. (1993)

Atsumasa Okada 等人：“与梁山断层相关的活动断层位移地形和断层露头（韩国南部）”韩国南部梁山断层地区的地震和活动断层（1993）。

尾池 和夫: "本格的に始まった地震学の日韓協力" 学術月報. (1993)

大池和夫：“日韩地震学合作已正式开始”学术月报（1993）。