{"_buckets": {"deposit": "6556e469-c091-464b-b178-8a43f6ee6697"}, "_deposit": {"id": "2933", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "2933"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00002933", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2018-09", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "2", "bibliographicPageEnd": "1214", "bibliographicPageStart": "1200", "bibliographicVolumeNumber": "215", "bibliographic_titles": [{"bibliographic_title": "Geophysical Journal International", "bibliographic_titleLang": "ja"}, {"bibliographic_title": "Geophysical Journal International", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "Offshore ocean bottom pressure gauges (OBPs) are often used to estimate the spatial distribution of the initial sea-surface height associated with offshore earthquakes (the tsunami source model). However, the sensors sometimes record pressure changes that are neither related to tsunamis nor seafloor coseismic displacements (the non-tsunami components) due to sensor rotation or tilt associated with ground shaking or due to long-term mechanical drift. These non-tsunami components can be a source of error when accurately estimating the tsunami source model and thus need to be removed to provide reliable coastal tsunami forecasts. This paper proposes a new method that uses time-derivative waveforms of the pressure time-series from OBP records to robustly estimate the tsunami source model, even when OBP data are perturbed by non-tsunami components. Using OBP data associated with the 2011 Off-Miyagi earthquake (Mw 7.2) and the 2016 Off-Mie earthquake (Mw 5.9), the performance of the method was evaluated when reducing artefacts due to non-tsunami components. The tsunami source model was found to be largely distorted when a conventional inversion method was used (because of the non-tsunami components). However, the artefact was dramatically reduced when using time-derivative waveforms, and the predicted coastal tsunami waveforms fitted reasonably with those of observations, thereby suggesting that the new method effectively suppresses artefacts caused by non-tsunami components. As the tsunami source models estimated from pressure and time-derivative waveforms should be similar when OBP data are not perturbed by non-tsunami components, we would be able to assess whether OBP data are perturbed by non-tsunami components by evaluating that the tsunami source models estimated from pressure waveforms and from time-derivative waveforms are similar to each other.", "subitem_description_language": "ja", "subitem_description_type": "Other"}, {"subitem_description": "Offshore ocean bottom pressure gauges (OBPs) are often used to estimate the spatial distribution of the initial sea-surface height associated with offshore earthquakes (the tsunami source model). However, the sensors sometimes record pressure changes that are neither related to tsunamis nor seafloor coseismic displacements (the non-tsunami components) due to sensor rotation or tilt associated with ground shaking or due to long-term mechanical drift. These non-tsunami components can be a source of error when accurately estimating the tsunami source model and thus need to be removed to provide reliable coastal tsunami forecasts. This paper proposes a new method that uses time-derivative waveforms of the pressure time-series from OBP records to robustly estimate the tsunami source model, even when OBP data are perturbed by non-tsunami components. Using OBP data associated with the 2011 Off-Miyagi earthquake (Mw 7.2) and the 2016 Off-Mie earthquake (Mw 5.9), the performance of the method was evaluated when reducing artefacts due to non-tsunami components. The tsunami source model was found to be largely distorted when a conventional inversion method was used (because of the non-tsunami components). However, the artefact was dramatically reduced when using time-derivative waveforms, and the predicted coastal tsunami waveforms fitted reasonably with those of observations, thereby suggesting that the new method effectively suppresses artefacts caused by non-tsunami components. As the tsunami source models estimated from pressure and time-derivative waveforms should be similar when OBP data are not perturbed by non-tsunami components, we would be able to assess whether OBP data are perturbed by non-tsunami components by evaluating that the tsunami source models estimated from pressure waveforms and from time-derivative waveforms are similar to each other.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "OXFORD UNIV PRESS", "subitem_publisher_language": "en"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.1093/gji/ggy345"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "1365-246X", "subitem_source_identifier_type": "EISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Tatsuya Kubota", "creatorNameLang": "ja"}, {"creatorName": "Tatsuya Kubota", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Wataru Suzuki", "creatorNameLang": "ja"}, {"creatorName": "Wataru Suzuki", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Takeshi Nakamura", "creatorNameLang": "ja"}, {"creatorName": "Takeshi Nakamura", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Naotaka Y. Chikasada", "creatorNameLang": "ja"}, {"creatorName": "Naotaka Y. Chikasada", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Shin Aoi", "creatorNameLang": "ja"}, {"creatorName": "Shin Aoi", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Narumi Takahashi", "creatorNameLang": "ja"}, {"creatorName": "Narumi Takahashi", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Ryota Hino", "creatorNameLang": "ja"}, {"creatorName": "Ryota Hino", "creatorNameLang": "en"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_title": "Tsunami source inversion using time-derivative waveform of offshore pressure records to reduce the effects of non-tsunami components", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Tsunami source inversion using time-derivative waveform of offshore pressure records to reduce the effects of non-tsunami components", "subitem_title_language": "ja"}, {"subitem_title": "Tsunami source inversion using time-derivative waveform of offshore pressure records to reduce the effects of non-tsunami components", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/2933", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-03-30"}, "publish_date": "2023-03-30", "publish_status": "0", "recid": "2933", "relation": {}, "relation_version_is_last": true, "title": ["Tsunami source inversion using time-derivative waveform of offshore pressure records to reduce the effects of non-tsunami components"], "weko_shared_id": -1}