Evidence for fault lubrication during the 1999 Chi‐Chi, Taiwan, earthquake (Mw7.6)
Identifieur interne : 000384 ( Main/Exploration ); précédent : 000383; suivant : 000385Evidence for fault lubrication during the 1999 Chi‐Chi, Taiwan, earthquake (Mw7.6)
Auteurs : Kuo-Fong Ma [Taïwan] ; Emily E. Brodsky [États-Unis] ; Jim Mori [Japon] ; Chen Ji [États-Unis] ; Teh-Ru A. Song [États-Unis] ; Hiroo Kanamori [États-Unis]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2003-03.
Abstract
The ground motion data of the 1999 Chi‐Chi, Taiwan, earthquake exhibit a striking difference in frequency content between the north and south portions of the rupture zone. In the north, the ground motion is dominated by large low‐frequency displacements with relatively small high‐frequency accelerations. The pattern is opposite in the south, with smaller displacements and larger accelerations. We analyze the fault dynamics in light of a fault lubrication mechanism using near‐field seismograms and a detailed rupture model. The fault zone contains viscous material (e.g., gouge), in which pressure increases following the Reynolds lubrication equation. When the displacement exceeds a threshold, lubrication pressure becomes high enough to widen the gap, thereby reducing the area of asperity contact. With less asperity contact, the fault slips more smoothly, suppressing high‐frequency radiation.
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DOI: 10.1029/2002GL015380
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Lett.</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2003-03">2003-03</date><biblScope unit="volume">30</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0094-8276</idno></series><idno type="istex">E7881F312C9E5D7B976A36394DDE7F863311D2AC</idno><idno type="DOI">10.1029/2002GL015380</idno><idno type="ArticleID">2002GL015380</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">The ground motion data of the 1999 Chi‐Chi, Taiwan, earthquake exhibit a striking difference in frequency content between the north and south portions of the rupture zone. In the north, the ground motion is dominated by large low‐frequency displacements with relatively small high‐frequency accelerations. The pattern is opposite in the south, with smaller displacements and larger accelerations. We analyze the fault dynamics in light of a fault lubrication mechanism using near‐field seismograms and a detailed rupture model. The fault zone contains viscous material (e.g., gouge), in which pressure increases following the Reynolds lubrication equation. When the displacement exceeds a threshold, lubrication pressure becomes high enough to widen the gap, thereby reducing the area of asperity contact. With less asperity contact, the fault slips more smoothly, suppressing high‐frequency radiation.</div></front></TEI><affiliations><list><country><li>Japon</li><li>Taïwan</li><li>États-Unis</li></country><region><li>Région du Kansai</li></region><settlement><li>Kyoto</li></settlement><orgName><li>Université de Kyoto</li></orgName></list><tree><country name="Taïwan"><noRegion><name sortKey="Ma, Kuo Ong" sort="Ma, Kuo Ong" uniqKey="Ma K" first="Kuo-Fong" last="Ma">Kuo-Fong Ma</name></noRegion></country><country name="États-Unis"><noRegion><name sortKey="Brodsky, Emily E" sort="Brodsky, Emily E" uniqKey="Brodsky E" first="Emily E." last="Brodsky">Emily E. Brodsky</name></noRegion><name sortKey="Ji, Chen" sort="Ji, Chen" uniqKey="Ji C" first="Chen" last="Ji">Chen Ji</name><name sortKey="Kanamori, Hiroo" sort="Kanamori, Hiroo" uniqKey="Kanamori H" first="Hiroo" last="Kanamori">Hiroo Kanamori</name><name sortKey="Song, Teh U A" sort="Song, Teh U A" uniqKey="Song T" first="Teh-Ru A." last="Song">Teh-Ru A. Song</name></country><country name="Japon"><region name="Région du Kansai"><name sortKey="Mori, Jim" sort="Mori, Jim" uniqKey="Mori J" first="Jim" last="Mori">Jim Mori</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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