ESR detection of seismic frictional heating events in the Nojima fault drill core samples, Japan
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| Title: | ESR detection of seismic frictional heating events in the Nojima fault drill core samples, Japan |
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| Authors: | Fukuchi, Tatsuro1 fukuchi@po.cc.yamaguchi-u.ac.jp, Yurugi, Jun-ichiro1, Imai, Noboru2 |
| Source: | Tectonophysics. Oct2007, Vol. 443 Issue 3/4, p127-138. 12p. |
| Subjects: | Electron paramagnetic resonance, Planes (Hand tools), Earthquakes, Particles (Nuclear physics) |
| Abstract: | Abstract: We have analyzed the Nojima fault NIED 1800 m drill core samples by ESR (Electron Spin Resonance) to detect seismic frictional heating events, especially during the 1995 Kobe Earthquake. Dark gray fault gouge with foliation >10 cm away from the fault plane at about 1140 m in depth, which was produced by ancient fault movements, has a FMR (ferrimagnetic resonance) signal. Heating experiments show that this FMR signal is derived from ferrimagnetic trivalent ion oxides (γ-Fe2O3: maghemite) with imperfect crystallinity, which is produced by thermal dehydration of γ-FeOOH (lepidocrocite) or Fe(OH)3 (limonite). The existence of the FMR signal means that dry heating such as frictional heating once occurred, and that the frictional heat temperature along the dark gray fault gouge may have risen to over 350 °C during ancient seismic fault slip. In order to detect frictional heating events in fault zones, the increase of the FMR signal and the color change of fault gouge into dark gray or black are important indexes. On the other hand, no FMR signal is detected from the fault gouges just on two fault planes at about 1140 m and 1300 m in depth, which are considered to be possible main fault planes in the 1995 Kobe Earthquake. These two fault planes may not have played an important role of fault slip in the Earthquake. [Copyright &y& Elsevier] |
| Copyright of Tectonophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 26836122 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: ESR detection of seismic frictional heating events in the Nojima fault drill core samples, Japan – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Fukuchi%2C+Tatsuro%22">Fukuchi, Tatsuro</searchLink><relatesTo>1</relatesTo><i> fukuchi@po.cc.yamaguchi-u.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Yurugi%2C+Jun-ichiro%22">Yurugi, Jun-ichiro</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Imai%2C+Noboru%22">Imai, Noboru</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Tectonophysics%22">Tectonophysics</searchLink>. Oct2007, Vol. 443 Issue 3/4, p127-138. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Electron+paramagnetic+resonance%22">Electron paramagnetic resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Planes+%28Hand+tools%29%22">Planes (Hand tools)</searchLink><br /><searchLink fieldCode="DE" term="%22Earthquakes%22">Earthquakes</searchLink><br /><searchLink fieldCode="DE" term="%22Particles+%28Nuclear+physics%29%22">Particles (Nuclear physics)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: We have analyzed the Nojima fault NIED 1800 m drill core samples by ESR (Electron Spin Resonance) to detect seismic frictional heating events, especially during the 1995 Kobe Earthquake. Dark gray fault gouge with foliation >10 cm away from the fault plane at about 1140 m in depth, which was produced by ancient fault movements, has a FMR (ferrimagnetic resonance) signal. Heating experiments show that this FMR signal is derived from ferrimagnetic trivalent ion oxides (γ-Fe2O3: maghemite) with imperfect crystallinity, which is produced by thermal dehydration of γ-FeOOH (lepidocrocite) or Fe(OH)3 (limonite). The existence of the FMR signal means that dry heating such as frictional heating once occurred, and that the frictional heat temperature along the dark gray fault gouge may have risen to over 350 °C during ancient seismic fault slip. In order to detect frictional heating events in fault zones, the increase of the FMR signal and the color change of fault gouge into dark gray or black are important indexes. On the other hand, no FMR signal is detected from the fault gouges just on two fault planes at about 1140 m and 1300 m in depth, which are considered to be possible main fault planes in the 1995 Kobe Earthquake. These two fault planes may not have played an important role of fault slip in the Earthquake. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Tectonophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.tecto.2007.01.020 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 127 Subjects: – SubjectFull: Electron paramagnetic resonance Type: general – SubjectFull: Planes (Hand tools) Type: general – SubjectFull: Earthquakes Type: general – SubjectFull: Particles (Nuclear physics) Type: general Titles: – TitleFull: ESR detection of seismic frictional heating events in the Nojima fault drill core samples, Japan Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Fukuchi, Tatsuro – PersonEntity: Name: NameFull: Yurugi, Jun-ichiro – PersonEntity: Name: NameFull: Imai, Noboru IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 10 Text: Oct2007 Type: published Y: 2007 Identifiers: – Type: issn-print Value: 00401951 Numbering: – Type: volume Value: 443 – Type: issue Value: 3/4 Titles: – TitleFull: Tectonophysics Type: main |
| ResultId | 1 |
