{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1363670319927519488.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/s0031-9201(96)03258-x"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S003192019603258X?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S003192019603258X?httpAccept=text/plain"}},{"identifier":{"@type":"NAID","@value":"30003875390"}}],"dc:title":[{"@value":"Morphology of the subducting slab boundary in the northeastern Japan arc"}],"description":[{"notation":[{"@value":"Abstract   The detection and location of the subducting slab boundary is crucial for a better understanding of the mechanical coupling between the subducting oceanic plate and the overlying continental plate, and of the occurrence of large and destructive earthquakes on the main thrust zone in the forearc region of subduction zones. It is also important for the understanding of the dehydration of the subducting slab and the genesis of island arc magmatism and volcanism. In this study we have estimated the morphology of the upper surface of the subducting Pacific plate under northeastern (NE) Japan by using 1372 SP converted waves at the slab boundary, and 666 earthquakes beneath the Pacific Ocean that are well located with sP depth phases. We found that the Pacific slab beneath NE Japan subducts at a small dip angle of less than 10° for the first descent to about 20 km depth and has a steeper dip angle of 15°–25° at 30–50 km depth and about 30° at deeper areas. The slab depth is approximately 50 km under the Pacific coast, 150 km under the Japan Sea coast, and nearly 100 km beneath the volcanic front. At 60–150 km depths, earthquakes in the lower plane of the double seismic zone occur in the central part of the slab, while the upper-plane events occur within 10–15 km beneath the slab boundary.  There is a change in the slab surface geometry around 38°N which corresponds to the landward extension of an oceanic fracture zone. The strike of the slab is NNE in the north and becomes NE in the south. The southern part of the slab has a steeper dip angle than the northern part. We believe that these features are related to the different patterns of interplate seismicity and mechanical coupling between the northern and southern parts of NE Japan. Many great (M8.0–8.5) interplate earthquakes have occured in northern NE Japan during recorded history (830–1995), and microearthquakes show a wide distribution in the forearc region from the Japan Trench to the Pacific coast, suggesting strong interplate seismic coupling in that region. In contrast, only a few M7.0–7.5 class earthquakes have occurred in southern NE Japan in the same period, and microearthquakes tend to cluster in many small areas, suggesting weaker interplate coupling there. The subducted slab may be segmented by the oceanic fracture zones, and the degree of seismic coupling changes from segment to segment. The behavior of the segment in southern NE Japan might be affected by the subducted seamounts so that the slab subducts at a steeper dip angle. This interpretation is supported by geomagnetic, topographic and geological studies which show that many small-sized seamounts were subducted in the past from the southern part of the Japan Trench, but almost no seamounts were subducted beneath the northern part."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1383670319927519488","@type":"Researcher","foaf:name":[{"@value":"Dapeng Zhao"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670319927519360","@type":"Researcher","foaf:name":[{"@value":"Toru Matsuzawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670319927519361","@type":"Researcher","foaf:name":[{"@value":"Akira Hasegawa"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00319201"}],"prism:publicationName":[{"@value":"Physics of the Earth and Planetary Interiors"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"1997-06","prism:volume":"102","prism:number":"1-2","prism:startingPage":"89","prism:endingPage":"104"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S003192019603258X?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S003192019603258X?httpAccept=text/plain"}],"createdAt":"2002-07-25","modifiedAt":"2023-04-15","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360002214349883520","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Stress‐driven relaxation of heterogeneous upper mantle and time‐dependent afterslip following the 2011 Tohoku earthquake"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004229801701248","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Along‐arc variation in the 3‐D thermal structure around the junction between the Japan and Kurile arcs"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004229807707136","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Temporal variation of intermediate‐depth earthquakes around the time of the <i>M</i>9.0 Tohoku‐oki earthquake"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232425620224","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Detection of metastable olivine wedge in the western Pacific slab and its geodynamic implications"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004240202138112","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Thermal structure and intermediate-depth seismicity in the Tohoku-Hokkaido subduction zones"}]},{"@id":"https://cir.nii.ac.jp/crid/1360022305564539392","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"2D resistivity model around the rupture area of the 2011 Tohoku-oki earthquake (Mw 9.0)"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285707500020224","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Autocorrelation analysis of ambient noise in northeastern Japan subduction zone"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285708262632832","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Supraslab earthquake clusters above the subduction plate boundary offshore Sanriku, northeastern Japan: Seismogenesis in a graveyard of detached seamounts?"}]},{"@id":"https://cir.nii.ac.jp/crid/1360286992174537856","@type":"Article","resourceType":"学術雑誌論文(journal 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Petrology"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567182379054336","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"P and S wave tomography of Japan subduction zone from joint inversions of local and teleseismic travel times and surface-wave data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567183443309824","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Physical mechanisms of oceanic mantle earthquakes: Comparison of natural and experimental events"}]},{"@id":"https://cir.nii.ac.jp/crid/1360580232380379648","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"The Moho, slab and tomography of the East Japan forearc derived from seafloor S-net data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360846640846254592","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Anomalous deepening of a seismic belt in the upper-plane of the double seismic zone in the Pacific slab beneath the Hokkaido corner: Possible evidence for thermal shielding caused by subducted forearc crust materials"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848657065441664","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Pre- and postseismic slow slip surrounding the 2011 Tohoku-oki earthquake rupture"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848657254682240","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Complex slab structure and arc magmatism beneath the Japanese Islands"}]},{"@id":"https://cir.nii.ac.jp/crid/1360869855114417536","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Stress drops of intermediate-depth intraslab earthquakes beneath Tohoku, northern Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1361412893259515776","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Arc-arc collision caused the 2018 Eastern Iburi earthquake (M 6.7) in Hokkaido, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204303022336","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Aftershock Distribution of the 2005 Miyagi-oki Earthquake (<I>M</I> 7.2) Revealed by Ocean Bottom Seismological Observation: Preliminary Results"},{"@language":"ja","@value":"海底地震観測による2005年宮城県沖地震 (<I>M</I> 7.2)の余震分布 (速報)"},{"@value":"海底地震観測による2005年宮城県沖地震(M7.2)の余震分布(速報)"},{"@language":"ja-Kana","@value":"カイテイ ジシン カンソク ニ ヨル 2005ネン ミヤギケンオキ ジシン M7 2 ノ ヨシン ブンプ ソクホウ"},{"@value":"Aftershock Distribution of the 2005 Miyagi-oki Earthquake (M 7.2) Revealed by Ocean Bottom Seismological Observation: Preliminary Results"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206511885696","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Crustal heterogeneity around the Nagamachi-Rifu fault, northeastern Japan, as inferred from travel-time tomography"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206512429696","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"The M7.1 May 26, 2003 off-shore Miyagi Prefecture Earthquake in northeast Japan"},{"@value":"The M7.1 May 26, 2003 off-shore Miyagi Prefecture Earthquake in northeast Japan: Source process and aftershock distribution of an intra-slab event"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679206692480","@type":"Article","resourceType":"学術雑誌論文(journal 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タヨウセイ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679279685888","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"A Study of Relation between Asperities of the Miyagi-oki Earthquake and Geometry of the Plate Boundary Estimated by the Distribution of JMA’s Integrated Hypocenters"},{"@language":"ja","@value":"宮城県沖地震のアスペリティとプレート境界面の形状に関する考察"},{"@value":"宮城県沖地震のアスペリティとプレート境界面の形状に関する考察--一元化震源による推定"},{"@language":"ja-Kana","@value":"ミヤギケンオキ ジシン ノ アスペリティ ト プレート キョウカイメン ノ ケイジョウ ニ カンスル コウサツ イチゲンカ シンゲン ニ ヨル スイテイ"},{"@value":"A Study of Relation between Asperities of the Miyagi-oki Earthquake and Geometry of the Plate Boundary Estimated by the Distribution of JMA^|^rsquo;s Integrated Hypocenters"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679281458432","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Relocation of Intermediate-depth Earthquakes beneath the NE Japan Arc by Double-Difference Location Method"},{"@language":"ja","@value":"Double-Difference Location 法による東北日本弧下の稍深発地震の震源再決定"},{"@language":"ja-Kana","@value":"Double-Difference Locationホウ ニ ヨル トウホク ニホン コ カ ノ ショウシンパツ ジシン ノ シンゲン サイケッテイ"}]},{"@id":"https://cir.nii.ac.jp/crid/1520009409040766848","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"2003年5月26日宮城県沖地震(M7.1)と二重深発地震面上面の地震活動--スラブ内大地震震源域における地震活動の特徴抽出"},{"@language":"ja-Kana","@value":"2003ネン 5ガツ 26ニチ ミヤギケンオキ ジシン M7 1 ト ニジュウ シンパツ ジシンメン ジョウメン ノ ジシン カツドウ スラブ ナイ ダイジシン シンゲンイキ ニ オケル ジシン カツドウ ノ トクチョウ チュウシュツ"}]},{"@id":"https://cir.nii.ac.jp/crid/1520573329756303488","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@value":"The M7.1 May 26, 2003 off-shore Miyagi Prefecture Earthquake in northeast Japan: Source process and aftershock distribution of an intra-slab event"},{"@language":"ja-Kana","@value":"M7 1 May 26 2003 off shore Miyagi Prefecture Earthquake 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