{"_buckets": {"deposit": "c55d3044-198c-4529-a52f-8f555880e381"}, "_deposit": {"id": "5981", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "5981"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00005981", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2014", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "15", "bibliographicPageStart": "1", "bibliographicVolumeNumber": "18", "bibliographic_titles": [{"bibliographic_title": "JAMSTEC Report of Research and Development", "bibliographic_titleLang": "ja"}, {"bibliographic_title": "JAMSTEC Rep. Res. Dev.", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "海洋研究開発機構では，空間規模の異なる複数の観測網の地震計データを受信している．セミグローバルな規模とローカルな規模の観測網のデータを同時に効率よく取り扱う為に，既存の地震モニタリングシステムであるSeisComP3を導入した．SeisComP3はもともとグローバル規模の観測網を用いた津波の早期検知を目的として開発されたシステムであるが，その機能拡張性の高さから，近年ローカルな観測網における地震モニタリングにも広く利用されている．一方，海洋研究開発機構において，熊野灘に展開されるDONET海底ケーブル地震観測網により，南海トラフ軸付近で多くの微小地震が観測されることが知られている．これらの地震活動をリスト化することは海溝軸付近のダイナミクスを知る上で重要である．しかし，SeisComP3の既存の地震検出機能の主目的が，大きなサイズの地震の早期検知，及び誤検知の回避にある為，観測網の検出能力の限界に近いような小さな地震が，既存のSC3の機能では取り逃されてしまう問題があった．そこでDONETに記録される微小地震を，地震データのリアルタイムモニタリングシステムで効率よく検出する為に，近接する観測点で一定の時間内に検出される複数のシグナルを束ねる機能をもつ，データ処理モジュール「binder」の開発を行った．binderを一日長のDONETデータに適用し，2 Hzから30 Hzの間で検出されるシグナルの一覧を作成した．binderが微小地震の検出に有用であることを確認した．4種類のフィルタを試した結果，観測網近傍の地震のP波の検出には，コーナー周波数が4 Hzと20 Hzのバンドパスフィルタが最適であった．また，既存の速度構造に依存せずにシグナルを束ねるというbinderの特性により，DONETデータに熊野海盆を発信源として概ね1.5 km/sで伝播する海洋にエネルギーの卓越したレイリー波（表面波）がしばしば捉えられていることを見つけた．これらの波の発信源の素性は現時点では不明であるが，このことによりbinderが時系列データに記録されている種々のイベントの探索に活用出来ることを示した．", "subitem_description_language": "ja", "subitem_description_type": "Other"}, {"subitem_description": "Seismic data from local size networks and a semi-global size network are being received at JAMSTEC. In order to systematically handle the data of the different network sizes, we attempted to apply SeisComP3, which is an earthquake monitoring system originally designed for detecting earthquakes or tsunamis in global or semi-global scales. On the other hand, it has been reported that many micro earthquakes are recorded in one of the networks, DONET. DONET is a local size network of ocean bottom seismometers deployed offshore of Kii peninsula. It is important to efficiently detect and list these earthquakes for the full utilization of the network data toward understanding the dynamics of the shallow part of the Nankai Trough. However, since the earthquake detection algorithm used in SeisComP3 focuses more on locating relatively large size earthquakes and minimizing the chance of detecting false events, some of the micro earthquakes do not get detected by the existing function of SeisComP3. Here, we developed a new SeisComP3 module, which binds signals detected at multiple stations within a certain distance and time span. We applied this module, which we call \"binder\", to one daylong DONET data. We examined four types of bandpass filter, which have their bandwidth somewhere between 2 and 30 Hz, and concluded that the filter with corner frequencies at 4 and 20 Hz most efficiently detects the signal of the micro earthquakes. We confirmed that the binder is useful for detecting micro earthquakes. Moreover, one of the binders advantages is that it works without assumptions on the velocity profile, thus it detected enigmatic events whose epicenters are located on the Kumano Basin and whose signal propagates at the velocity of around 1.5 km/s throughout the stations placed on the basin. No clear P arrivals were observed for these events. The finding demonstrates the possibility of the binder to become a useful tool to further explore the data and to find out more of different types of events, which have not been identified yet.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "Japan Agency for Marine-Earth Science and Technology", "subitem_publisher_language": "ja"}, {"subitem_publisher": "Japan Agency for Marine-Earth Science and Technology", "subitem_publisher_language": "en"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.5918/jamstecr.18.1"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "1880-1153", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "藤 亜希子", "creatorNameLang": "ja"}, {"creatorName": "To Akiko", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Becker Jan", "creatorNameLang": "ja"}, {"creatorName": "Becker Jan", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Weber Bernd", "creatorNameLang": "ja"}, {"creatorName": "Weber Bernd", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "高江洲 盛史", "creatorNameLang": "ja"}, {"creatorName": "Takaesu Morifumi", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "高橋 成実", "creatorNameLang": "ja"}, {"creatorName": "Takahashi Narumi", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "深尾 良夫", "creatorNameLang": "ja"}, {"creatorName": "Fukao Yoshio", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "坪井 誠司", "creatorNameLang": "ja"}, {"creatorName": "Tsuboi Seiji", "creatorNameLang": "en"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_title": "微小地震検出の為のSeisComP3モジュールの開発，及び海底ケーブルデータへの適用", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "微小地震検出の為のSeisComP3モジュールの開発，及び海底ケーブルデータへの適用", "subitem_title_language": "ja"}, {"subitem_title": "Development of a SeisComP3 module for detecting micro earthquakes and its application to ocean bottom network data", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/5981", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-03-30"}, "publish_date": "2023-03-30", "publish_status": "0", "recid": "5981", "relation": {}, "relation_version_is_last": true, "title": ["微小地震検出の為のSeisComP3モジュールの開発，及び海底ケーブルデータへの適用"], "weko_shared_id": -1}