{"created":"2023-12-25T05:16:48.032682+00:00","id":2000470,"links":{},"metadata":{"_buckets":{"deposit":"1a6f69b6-545c-47be-b867-7e02ddb3874d"},"_deposit":{"created_by":6,"id":"2000470","owner":"6","owners":[6],"pid":{"revision_id":0,"type":"depid","value":"2000470"},"status":"published"},"_oai":{"id":"oai:nagasaki-u.repo.nii.ac.jp:02000470","sets":["14:21"]},"author_link":[],"item_2_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2023-12-14","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageStart":"art. no. 22199","bibliographicVolumeNumber":"13","bibliographic_titles":[{"bibliographic_title":"Scientific Reports","bibliographic_titleLang":"en"}]}]},"item_2_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Marine natural gas hydrate (NGH) is a promising substitutive low‑carbon energy resource, whereas NGH‑production induced geoengineering concerns remain challenging. Advanced forecast of possible geoengineering risks is the fundamental for eco‑friendly NGH exploitation. Reservoir creep deformation is an early symptom of the geoengineering risks. However, whether the creep deformation behaviors of the NGH‑bearing strata is predictable remains controversial. In this study, a series of multi‑step loading creep test are conducted for sandy gas hydrate bearing sediment (GHBS) samples, during which the ultrasonic responses are recorded simultaneously. The acoustic velocity, compression‑to‑shear velocity ratio, Poission’s ratio, main frequency, and main frequency amplitude are used to characterize creep failures of the GHBS for the first time. Combining analyses of the creep behaviors and acoustic responses yield the following conclusions. Firstly, the long‑term strength derived from creeping test is 0.45–0.60 times of the shear strength derived from triaxial shearing. Ignoring the creep effect might underestimate the scale and intensity of possible geoengineering risks during long‑term NGH exploitation. Secondly, the acoustic velocity increases gently and then decreases continuously during creeping. Once the accelerated creep appears, the acoustic velocity plummets significantly, together with a sudden decrease in the compression‑to‑shear velocity ratio, and fluctuations in the main frequency and its amplitude. Furthermore, the main frequency and its amplitude shall fluctuate abruptly prior to the emergence of the accelerated creep. Therefore, we anticipate that the combination of abnormal fluctuations of main frequency and its amplitude can be used as early‑warning indicators for possible creep failure of the GHBS. The results might have great significance for in‑situ detection and prediction of possible reservoir failure during long‑term NGH exploitation.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_2_description_63":{"attribute_name":"引用","attribute_value_mlt":[{"subitem_description":"Scientific Reports, 13(1), art. no. 22199; 2023","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_2_publisher_33":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Springer Nature","subitem_publisher_language":"en"}]},"item_2_relation_12":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type":"isIdenticalTo","subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1038/s41598-023-49523-1","subitem_relation_type_select":"DOI"}}]},"item_2_rights_13":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2023","subitem_rights_language":"en"}]},"item_2_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"20452322","subitem_source_identifier_type":"EISSN"}]},"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":"Li, Yanlong","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Hu, Qiaobo","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Wu, Nengyou","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Wang, Hongbin","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Sun, Xiaofeng","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Hu, Gaowei","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Sun, Zhiwen","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Jiang, Yujing","creatorNameLang":"en"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2023-12-25"}],"filename":"SR13_22199.pdf","filesize":[{"value":"2.5 MB"}],"format":"application/pdf","url":{"url":"https://nagasaki-u.repo.nii.ac.jp/record/2000470/files/SR13_22199.pdf"},"version_id":"80dd7dfd-97d8-422e-8e50-6001365570cc"}]},"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":"Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment","subitem_title_language":"en"}]},"item_type_id":"2","owner":"6","path":["21"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-12-25"},"publish_date":"2023-12-25","publish_status":"0","recid":"2000470","relation_version_is_last":true,"title":["Acoustic characterization for creep behaviors of marine sandy hydrate-bearing sediment"],"weko_creator_id":"6","weko_shared_id":-1},"updated":"2023-12-25T05:22:10.924743+00:00"}