Collision and fan‐shaped compressional stress pattern in the Izu Block at the northern edge of the Philippine Sea Plate
Identifieur interne : 001304 ( Istex/Corpus ); précédent : 001303; suivant : 001305Collision and fan‐shaped compressional stress pattern in the Izu Block at the northern edge of the Philippine Sea Plate
Auteurs : Motoo UkawaSource :
- Journal of Geophysical Research: Solid Earth [ 0148-0227 ] ; 1991-01-10.
Abstract
The Izu block in central Japan, which is surrounded by the Nankai‐Suruga trough and the Sagami trough, is considered to be colliding with the Eurasian (EUR) plate at the northern edge of the Philippine Sea (PHS) plate. The stress state in the Izu block is investigated from focal mechanism data mainly obtained by the seismic network of the National Research Institute for Earth Science and Disaster Prevention. The predominant focal mechanisms in the central to eastern part of the Izu block indicate strike‐slip faulting with P axes oriented N–S to NW–SE and T axes oriented E–W to NE–SW, whereas focal mechanisms in the western part are strike‐slip and reverse faulting with P axes oriented N–S to NE–SW, indicating that the compressional axes remain horizontal throughout the region. The compressional stress trajectories estimated from the P axes show a fan‐shaped pattern, radiating from the northern edge of the Izu block where the collision is considered to be occurring. The fan‐shaped pattern of compressional stress trajectories is interpreted to be the result of the collision of the Izu block with EUR plate. Plane stress analysis by the finite element method supports this conclusion. The stable distribution of the T axis directions in the central to eastern part is basically interpreted as resulting from the slab pull force by the subducting PHS plate along the Sagami trough. Furthermore this model can explain the seismic quiescence in the northern part of the Suruga Bay region.
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DOI: 10.1029/90JB02142
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Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="1991-01-10">1991-01-10</date><biblScope unit="volume">96</biblScope><biblScope unit="issue">B1</biblScope><biblScope unit="page" from="713">713</biblScope><biblScope unit="page" to="728">728</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">322F54566991124613CC42111446FBA933E198EA</idno><idno type="DOI">10.1029/90JB02142</idno><idno type="ArticleID">90JB02142</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">The Izu block in central Japan, which is surrounded by the Nankai‐Suruga trough and the Sagami trough, is considered to be colliding with the Eurasian (EUR) plate at the northern edge of the Philippine Sea (PHS) plate. The stress state in the Izu block is investigated from focal mechanism data mainly obtained by the seismic network of the National Research Institute for Earth Science and Disaster Prevention. The predominant focal mechanisms in the central to eastern part of the Izu block indicate strike‐slip faulting with P axes oriented N–S to NW–SE and T axes oriented E–W to NE–SW, whereas focal mechanisms in the western part are strike‐slip and reverse faulting with P axes oriented N–S to NE–SW, indicating that the compressional axes remain horizontal throughout the region. The compressional stress trajectories estimated from the P axes show a fan‐shaped pattern, radiating from the northern edge of the Izu block where the collision is considered to be occurring. The fan‐shaped pattern of compressional stress trajectories is interpreted to be the result of the collision of the Izu block with EUR plate. Plane stress analysis by the finite element method supports this conclusion. The stable distribution of the T axis directions in the central to eastern part is basically interpreted as resulting from the slab pull force by the subducting PHS plate along the Sagami trough. Furthermore this model can explain the seismic quiescence in the northern part of the Suruga Bay region.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Motoo Ukawa</name></json:item></author><articleId><json:string>90JB02142</json:string></articleId><language><json:string>eng</json:string></language><abstract>The Izu block in central Japan, which is surrounded by the Nankai‐Suruga trough and the Sagami trough, is considered to be colliding with the Eurasian (EUR) plate at the northern edge of the Philippine Sea (PHS) plate. The stress state in the Izu block is investigated from focal mechanism data mainly obtained by the seismic network of the National Research Institute for Earth Science and Disaster Prevention. The predominant focal mechanisms in the central to eastern part of the Izu block indicate strike‐slip faulting with P axes oriented N–S to NW–SE and T axes oriented E–W to NE–SW, whereas focal mechanisms in the western part are strike‐slip and reverse faulting with P axes oriented N–S to NE–SW, indicating that the compressional axes remain horizontal throughout the region. The compressional stress trajectories estimated from the P axes show a fan‐shaped pattern, radiating from the northern edge of the Izu block where the collision is considered to be occurring. The fan‐shaped pattern of compressional stress trajectories is interpreted to be the result of the collision of the Izu block with EUR plate. Plane stress analysis by the finite element method supports this conclusion. The stable distribution of the T axis directions in the central to eastern part is basically interpreted as resulting from the slab pull force by the subducting PHS plate along the Sagami trough. 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The stable distribution of the T axis directions in the central to eastern part is basically interpreted as resulting from the slab pull force by the subducting PHS plate along the Sagami trough. Furthermore this model can explain the seismic quiescence in the northern part of the Suruga Bay region.</p></abstract><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>MARINE GEOLOGY AND GEOPHYSICS</term></item><item><term>Plate tectonics</term></item><item><term>TECTONOPHYSICS</term></item><item><term>Plate boundary: general</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>article-category</head><item><term>Papers on Geodesy and Gravity Tectonophysics</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1989-09-11">Received</change><change when="1990-09-25">Registration</change><change when="1991-01-10">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/322F54566991124613CC42111446FBA933E198EA/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component type="serialArticle" version="2.0" xml:lang="en" xml:id="jgrb7985"><header><publicationMeta level="product"><doi>10.1002/(ISSN)2156-2202b</doi><issn type="print">0148-0227</issn><issn type="electronic">2156-2202</issn><idGroup><id type="product" value="JGRB"></id><id type="coden" value="JGREA2"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH">Journal of Geophysical Research: Solid Earth</title><title type="short">J. 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Geophys. Res.</journalTitle>, <vol>96</vol>(<issue>B1</issue>), <pageFirst>713</pageFirst>–<pageLast>728</pageLast>, doi:<accessionId ref="info:doi/10.1029/90JB02142">10.1029/90JB02142</accessionId>.</citation></selfCitationGroup><linkGroup><link type="toTypesetVersion" href="file:JGRB.JGRB7985.pdf"></link></linkGroup></publicationMeta><contentMeta><titleGroup><title type="main">Collision and fan‐shaped compressional stress pattern in the Izu Block at the northern edge of the Philippine Sea Plate</title><title type="shortAuthors">Ukawa</title></titleGroup><creators><creator xml:id="jgrb7985-cr-0001"><personName><givenNames>Motoo</givenNames><familyName>Ukawa</familyName></personName></creator></creators><abstractGroup><abstract type="main"><p xml:id="jgrb7985-para-0001">The Izu block in central Japan, which is surrounded by the Nankai‐Suruga trough and the Sagami trough, is considered to be colliding with the Eurasian (EUR) plate at the northern edge of the Philippine Sea (PHS) plate. The stress state in the Izu block is investigated from focal mechanism data mainly obtained by the seismic network of the National Research Institute for Earth Science and Disaster Prevention. The predominant focal mechanisms in the central to eastern part of the Izu block indicate strike‐slip faulting with <i>P</i> axes oriented N–S to NW–SE and <i>T</i> axes oriented E–W to NE–SW, whereas focal mechanisms in the western part are strike‐slip and reverse faulting with <i>P</i> axes oriented N–S to NE–SW, indicating that the compressional axes remain horizontal throughout the region. The compressional stress trajectories estimated from the <i>P</i> axes show a fan‐shaped pattern, radiating from the northern edge of the Izu block where the collision is considered to be occurring. The fan‐shaped pattern of compressional stress trajectories is interpreted to be the result of the collision of the Izu block with EUR plate. Plane stress analysis by the finite element method supports this conclusion. The stable distribution of the <i>T</i> axis directions in the central to eastern part is basically interpreted as resulting from the slab pull force by the subducting PHS plate along the Sagami trough. Furthermore this model can explain the seismic quiescence in the northern part of the Suruga Bay region.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Collision and fan‐shaped compressional stress pattern in the Izu Block at the northern edge of the Philippine Sea Plate</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Collision and fan‐shaped compressional stress pattern in the Izu Block at the northern edge of the Philippine Sea Plate</title></titleInfo><name type="personal"><namePart type="given">Motoo</namePart><namePart type="family">Ukawa</namePart></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><dateIssued encoding="w3cdtf">1991-01-10</dateIssued><dateCaptured encoding="w3cdtf">1989-09-11</dateCaptured><dateValid encoding="w3cdtf">1990-09-25</dateValid><edition>Ukawa, M. (1991), Collision and fan‐shaped compressional stress pattern in the Izu Block at the northern edge of the Philippine Sea Plate, J. Geophys. Res., 96(B1), 713–728, doi:10.1029/90JB02142.</edition><copyrightDate encoding="w3cdtf">1991</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract>The Izu block in central Japan, which is surrounded by the Nankai‐Suruga trough and the Sagami trough, is considered to be colliding with the Eurasian (EUR) plate at the northern edge of the Philippine Sea (PHS) plate. The stress state in the Izu block is investigated from focal mechanism data mainly obtained by the seismic network of the National Research Institute for Earth Science and Disaster Prevention. The predominant focal mechanisms in the central to eastern part of the Izu block indicate strike‐slip faulting with P axes oriented N–S to NW–SE and T axes oriented E–W to NE–SW, whereas focal mechanisms in the western part are strike‐slip and reverse faulting with P axes oriented N–S to NE–SW, indicating that the compressional axes remain horizontal throughout the region. The compressional stress trajectories estimated from the P axes show a fan‐shaped pattern, radiating from the northern edge of the Izu block where the collision is considered to be occurring. The fan‐shaped pattern of compressional stress trajectories is interpreted to be the result of the collision of the Izu block with EUR plate. Plane stress analysis by the finite element method supports this conclusion. The stable distribution of the T axis directions in the central to eastern part is basically interpreted as resulting from the slab pull force by the subducting PHS plate along the Sagami trough. Furthermore this model can explain the seismic quiescence in the northern part of the Suruga Bay region.</abstract><relatedItem type="host"><titleInfo><title>Journal of Geophysical Research: Solid Earth</title></titleInfo><titleInfo type="abbreviated"><title>J. Geophys. 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