{"created":"2023-07-25T11:07:07.937005+00:00","id":10746,"links":{},"metadata":{"_buckets":{"deposit":"ad3e3d33-1703-44c2-b5ea-eb1b65c11610"},"_deposit":{"created_by":27,"id":"10746","owners":[27],"pid":{"revision_id":0,"type":"depid","value":"10746"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00010746","sets":[]},"author_link":["23175","23176","23177","23174"],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2015-03","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"145","bibliographicPageStart":"130","bibliographicVolumeNumber":"9","bibliographic_titles":[{"bibliographic_title":"Polar Science"},{"bibliographic_title":"Polar Science","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Observation of Lg seismic waves at regional distances has long been considered indicative of continental crust that is 30–40 km thick. This study updates an earlier assessment of Lg propagation efficiency to characterize continental or non-continental crust and related structures across the Amerasia Basin and surrounding continental areas of the high Arctic. Recent refraction surveys and receiver function studies provide crustal thickness estimates of 18–41 km for comparison. Among 7000 candidate earthquake–station pairs considered, no classic Lg phases (0.14–2 Hz) are observed to cross the Amerasia Basin (Canada Basin, Alpha-Mendeleev Ridge) efficiently, but lower frequency (0.035–0.17 Hz) arrivals with group velocities intermediate between Lg and Sn (sometimes called early Lg) are observed along many ray paths crossing the basin. The characteristic frequencies of these observed arrivals match well with those of synthetic waves propagated within models with thinned or pinched continental crust, such as crust characteristic of the North Sea, and thus suggest that most parts of the Amerasia Basin have a crustal thickness intermediate between that typical of thin continental and oceanic crust.","subitem_description_type":"Abstract"}]},"item_10001_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"地域的スケールでLg地震波が観測されることは、30?40 kmの厚さを持つ大陸地殻の存在を示唆すると長い間考えられてきた。この研究では、これまでのLg波の伝搬効果を再評価した。 最近の屈折法地震探査やレシーバ関数の研究によると、比較の対象となる地殻の厚さは推定18?41 kmである。本研究では7000の地震・観測点の組み合わせを考慮したが、アメラシア盆地（カナダ盆地とアルファ・メンデレエフ海嶺）を効果的に横切る通常のLg波(0.14?2 Hz)は観測されなかった。しかし、Lg 波とSn 波 (初期 Lg波と呼ばれることもある)の中間の群速度をもつ低周波数(0.035?0.17 Hz)の波が、アメラシア盆地を横切る多くの地震波経路で観測された。 観測されたこれら波群に特徴的な周波数は、北海（North Sea）で特徴的な地殻のように、薄化または挟まれた大陸地殻モデルを伝搬する理論波形と非常によく合っている。このことはアメラシア盆地の大部分が、薄化した大陸地殻と海洋地殻のそれぞれに典型的な厚さの、中間的な値を持つことを示唆している。","subitem_description_type":"Other"}]},"item_10001_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"10.1016/j.polar.2014.09.001"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://doi.org/10.1016/j.polar.2014.09.001","subitem_relation_type_select":"DOI"}}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Karen Chiu"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"David B. Snyder"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Karen Chiu","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"David B. Snyder","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Amerasia Basin","subitem_subject_scheme":"Other"},{"subitem_subject":"Arctic Ocean crust","subitem_subject_scheme":"Other"},{"subitem_subject":"Lg propagation","subitem_subject_scheme":"Other"},{"subitem_subject":"Amerasia Basin","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Arctic Ocean crust","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Lg propagation","subitem_subject_language":"en","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":"Regional seismic wave propagation (Lg & Sn phases) in the Amerasia Basin and High Arctic","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Regional seismic wave propagation (Lg & Sn phases) in the Amerasia Basin and High Arctic"},{"subitem_title":"Regional seismic wave propagation (Lg & Sn phases) in the Amerasia Basin and High Arctic","subitem_title_language":"en"}]},"item_type_id":"10001","owner":"27","path":["1397"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-04-02"},"publish_date":"2015-04-02","publish_status":"0","recid":"10746","relation_version_is_last":true,"title":["Regional seismic wave propagation (Lg & Sn phases) in the Amerasia Basin and High Arctic"],"weko_creator_id":"27","weko_shared_id":27},"updated":"2023-07-25T16:22:26.237158+00:00"}