{"created":"2023-05-15T16:49:01.393495+00:00","id":26283,"links":{},"metadata":{"_buckets":{"deposit":"13db91f7-458a-49d4-af6c-eb16b792b0d4"},"_deposit":{"created_by":6,"id":"26283","owners":[6],"pid":{"revision_id":0,"type":"depid","value":"26283"},"status":"published"},"_oai":{"id":"oai:nagasaki-u.repo.nii.ac.jp:00026283","sets":["6:7"]},"author_link":["112368","112369","112367","112365","112366"],"item_2_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2020-12-31","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageStart":"43","bibliographicVolumeNumber":"11","bibliographic_titles":[{"bibliographic_title":"Minerals"}]}]},"item_2_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The 2016 Kumamoto earthquake had a significant impact on groundwater levels and quality. In some areas, the groundwater level increased significantly due to the release of groundwater from upstream mountainous regions. Conversely, the groundwater level in other areas greatly decreased due to the creation of new fracture networks by the earthquake. There were also significant changes in certain groundwater quality variables. In this study, we used clustering based SOM (self-organizing maps) analysis to improve the understanding of earthquake effects on groundwater quality. We were especially interested in effects on groundwater used for drinking purposes and in nitrate concentration. For this purpose, we studied groundwater nitrate (NO3 + NO2–N) concentrations for the period 2012–2017. Nitrate concentration changes were classified into seven typical SOM clusters. The clusters were distributed in three representative geographical regions: A high concentration region (>4 mg/L), a low concentration region (<1.6 mg/L) with minimal anthropogenic loading area, and an intermediate concentration region (2–4 mg/L). Depending on these regions, the nitrate concentration changes just before and after the earthquake had both increasing and decreasing trends between 2015–2017. This points to complex physiographical relationships for release of stored upstream groundwater, promotion of infiltration of shallow soil water/groundwater, and nitrate concentration as affected by earthquakes. We present an analysis of these complex relationships and a discussion of causes of nitrate concentration changes due to earthquakes.","subitem_description_type":"Abstract"}]},"item_2_description_63":{"attribute_name":"引用","attribute_value_mlt":[{"subitem_description":"Minerals, 11(1), art.no.43 ;2021","subitem_description_type":"Other"}]},"item_2_relation_12":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type":"isIdenticalTo","subitem_relation_type_id":{"subitem_relation_type_id_text":"10.3390/min11010043","subitem_relation_type_select":"DOI"}}]},"item_2_rights_13":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).                   "}]},"item_2_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"2075-163X","subitem_source_identifier_type":"ISSN"}]},"item_2_version_type_16":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Nakagawa, Kei"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Shimada, Jun"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Yu, Zhi-Qiang"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Ide, Kiyoshi"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Berndtsson, Ronny"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2021-01-27"}],"displaytype":"detail","filename":"Minerals11_43.pdf","filesize":[{"value":"9.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Minerals11_43.pdf","url":"https://nagasaki-u.repo.nii.ac.jp/record/26283/files/Minerals11_43.pdf"},"version_id":"05c2b2ae-a32a-4676-a6de-84c9b1140316"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"2016 Kumamoto earthquake","subitem_subject_scheme":"Other"},{"subitem_subject":"Groundwater","subitem_subject_scheme":"Other"},{"subitem_subject":"Nitrate","subitem_subject_scheme":"Other"},{"subitem_subject":"Self-organizing maps","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Effects of the Japanese 2016 Kumamoto Earthquake on Nitrate Content in Groundwater Supply","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Effects of the Japanese 2016 Kumamoto Earthquake on Nitrate Content in Groundwater Supply"}]},"item_type_id":"2","owner":"6","path":["7"],"pubdate":{"attribute_name":"公開日","attribute_value":"2021-01-27"},"publish_date":"2021-01-27","publish_status":"0","recid":"26283","relation_version_is_last":true,"title":["Effects of the Japanese 2016 Kumamoto Earthquake on Nitrate Content in Groundwater Supply"],"weko_creator_id":"6","weko_shared_id":-1},"updated":"2023-05-15T20:28:17.377598+00:00"}