Slow slip events in Mexico revised from the processing of 11 year GPS observations
Identifieur interne : 002537 ( Istex/Curation ); précédent : 002536; suivant : 002538Slow slip events in Mexico revised from the processing of 11 year GPS observations
Auteurs : M. Vergnolle [France] ; A. Walpersdorf [France] ; V. Kostoglodov [Mexique] ; P. Tregoning [Australie] ; J. A. Santiago [Mexique] ; N. Cotte [France] ; S. I. Franco [Mexique]Source :
- Journal of Geophysical Research: Solid Earth [ 0148-0227 ] ; 2010-08.
English descriptors
- KwdEn :
- Acap, American plate reference frame, American plates, Anomalous, Anomalous displacement, Anomalous displacements, Anomaly, Aseismic, Atmospheric loading, Boehm, Brudzinski, Caya, Central guerrero, Central mexico, Central oaxaca, Coastal stations, Cotte, Cumulative displacement, Cumulative displacements, Data gaps, Dislocation model, Displacement, Earth planet, East component, Fault plane, Franco, Geophys, Global, Global pressure, Global solution, Grace data, Guerrero, Guerrero area, Guerrero stations, Guerrero subduction zone, Horizontal components, Horizontal displacement, Horizontal displacements, Hydrologic, Hydrological, Hydrological loading, Iglesias, Instantaneous velocity, Interface, Kostoglodov, Large sses, Larson, Lett, Level model, Loading, Lowry, Main phase, Mapping function, Mexico city, Numerical weather models, Oaxaca, Oaxaca state, Oaxaca stations, Oaxaca subduction zone, Observation level, Ocean tide loading, Pino, Position estimates, Position time series, Processing strategy, Reference frame, Schuh, Seismogenic, Seismogenic zone, Silent earthquake, Singh, Small sses, Southern mexico, Spatiotemporal, Spatiotemporal evolution, Spectral analysis, Ss, Standard strategy, Station acap, Station caya, Station zihp, Statistical parameters, Subduction, Subduction interface, Subduction zone, Surface displacement, Surface displacements, Surface loads, Tectonic, Time evolution, Time series, Transition zone, Tregoning, Trench, Universidad nacional, Vergnolle, Vertical component, Vertical components, Vertical displacements, Vertical position time series, Wrms, Zihp, Zone.
- Teeft :
- Acap, American plate reference frame, American plates, Anomalous, Anomalous displacement, Anomalous displacements, Anomaly, Aseismic, Atmospheric loading, Boehm, Brudzinski, Caya, Central guerrero, Central mexico, Central oaxaca, Coastal stations, Cotte, Cumulative displacement, Cumulative displacements, Data gaps, Dislocation model, Displacement, Earth planet, East component, Fault plane, Franco, Geophys, Global, Global pressure, Global solution, Grace data, Guerrero, Guerrero area, Guerrero stations, Guerrero subduction zone, Horizontal components, Horizontal displacement, Horizontal displacements, Hydrologic, Hydrological, Hydrological loading, Iglesias, Instantaneous velocity, Interface, Kostoglodov, Large sses, Larson, Lett, Level model, Loading, Lowry, Main phase, Mapping function, Mexico city, Numerical weather models, Oaxaca, Oaxaca state, Oaxaca stations, Oaxaca subduction zone, Observation level, Ocean tide loading, Pino, Position estimates, Position time series, Processing strategy, Reference frame, Schuh, Seismogenic, Seismogenic zone, Silent earthquake, Singh, Small sses, Southern mexico, Spatiotemporal, Spatiotemporal evolution, Spectral analysis, Ss, Standard strategy, Station acap, Station caya, Station zihp, Statistical parameters, Subduction, Subduction interface, Subduction zone, Surface displacement, Surface displacements, Surface loads, Tectonic, Time evolution, Time series, Transition zone, Tregoning, Trench, Universidad nacional, Vergnolle, Vertical component, Vertical components, Vertical displacements, Vertical position time series, Wrms, Zihp, Zone.
Abstract
The world's largest observed Slow Slip Events (SSE) occurred in 2001–2002 and 2006 in the Guerrero subduction zone, Mexico. Using an improved GPS processing that accounts for time‐varying atmospheric phenomena as well as oceanic, atmospheric and hydrologic loading corrections, the 11 year GPS position time series in Guerrero show a noise reduction of ∼50% with respect to previous studies. Thanks to the improved position time series and, in particular, the simultaneous analysis of the three‐dimensional GPS observations, we can provide new information about SSEs in the studied area. First, we detect seven nonperiodic anomalous displacements with subcentimeter amplitude, but no quasi‐annual anomalies as proposed previously. The displacements seem to occur simultaneously with the observed peaks of non‐volcanic tremor activity in the area. Second, we refine the characteristics of the two major SSEs in terms of timing, duration, and cumulative displacements, and highlight the complex surface spatiotemporal evolution of the displacements during these SSEs. In particular, we observe a clear initiation phase for the 2006 SSE as well as ending phases for both large SSEs. The ending phase shows a strong deceleration of the anomalous displacements with respect to the main displacement phase already observed, for the 2001–2002 and 2006 SSEs. The duration of the SSEs increases by 30–40% including the initiation and ending phases. For the 2006 SSE, the main displacement phase also shows spatiotemporal complexity. Our results demonstrate the need for improved three‐dimensional GPS processing technique in order to undertake detailed studies of SSEs.
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DOI: 10.1029/2009JB006852
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Vergnolle</name><affiliation wicri:level="1"><mods:affiliation>E-mail: mathilde.vergnolle@obs.ujf-grenoble.fr</mods:affiliation><country wicri:rule="url">France</country></affiliation><affiliation wicri:level="1"><mods:affiliation>Laboratoire de Géophysique Interne et Tectonophysique, CNRS, Observatoire de Grenoble, Université Joseph Fourier, Grenoble, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Géophysique Interne et Tectonophysique, CNRS, Observatoire de Grenoble, Université Joseph Fourier, Grenoble</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Now at Géoazur, UMR6526, University of Nice, CNRS, Valbonne, France.</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Now at Géoazur, UMR6526, University of Nice, CNRS, Valbonne</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: mathilde.vergnolle@obs.ujf-grenoble.fr</mods:affiliation><country wicri:rule="url">France</country></affiliation></author><author><name sortKey="Walpersdorf, A" sort="Walpersdorf, A" uniqKey="Walpersdorf A" first="A." last="Walpersdorf">A. 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Vergnolle</name><affiliation wicri:level="1"><mods:affiliation>E-mail: mathilde.vergnolle@obs.ujf-grenoble.fr</mods:affiliation><country wicri:rule="url">France</country></affiliation><affiliation wicri:level="1"><mods:affiliation>Laboratoire de Géophysique Interne et Tectonophysique, CNRS, Observatoire de Grenoble, Université Joseph Fourier, Grenoble, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Géophysique Interne et Tectonophysique, CNRS, Observatoire de Grenoble, Université Joseph Fourier, Grenoble</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Now at Géoazur, UMR6526, University of Nice, CNRS, Valbonne, France.</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Now at Géoazur, UMR6526, University of Nice, CNRS, Valbonne</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: mathilde.vergnolle@obs.ujf-grenoble.fr</mods:affiliation><country wicri:rule="url">France</country></affiliation></author><author><name sortKey="Walpersdorf, A" sort="Walpersdorf, A" uniqKey="Walpersdorf A" first="A." last="Walpersdorf">A. 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Kostoglodov</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico</mods:affiliation><country xml:lang="fr">Mexique</country><wicri:regionArea>Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City</wicri:regionArea></affiliation></author><author><name sortKey="Tregoning, P" sort="Tregoning, P" uniqKey="Tregoning P" first="P." last="Tregoning">P. Tregoning</name><affiliation wicri:level="1"><mods:affiliation>Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Earth Sciences, Australian National University, Canberra, ACT</wicri:regionArea></affiliation></author><author><name sortKey="Santiago, J A" sort="Santiago, J A" uniqKey="Santiago J" first="J. A." last="Santiago">J. A. Santiago</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico</mods:affiliation><country xml:lang="fr">Mexique</country><wicri:regionArea>Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City</wicri:regionArea></affiliation></author><author><name sortKey="Cotte, N" sort="Cotte, N" uniqKey="Cotte N" first="N." last="Cotte">N. Cotte</name><affiliation wicri:level="1"><mods:affiliation>Laboratoire de Géophysique Interne et Tectonophysique, CNRS, Observatoire de Grenoble, Université Joseph Fourier, Grenoble, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Géophysique Interne et Tectonophysique, CNRS, Observatoire de Grenoble, Université Joseph Fourier, Grenoble</wicri:regionArea></affiliation></author><author><name sortKey="Franco, S I" sort="Franco, S I" uniqKey="Franco S" first="S. I." last="Franco">S. I. Franco</name><affiliation wicri:level="1"><mods:affiliation>Servicio Sismológico Nacional, Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico</mods:affiliation><country xml:lang="fr">Mexique</country><wicri:regionArea>Servicio Sismológico Nacional, Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Geophysical Research: Solid Earth</title><title level="j" type="alt">JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><biblScope unit="vol">115</biblScope><biblScope unit="issue">B8</biblScope><biblScope unit="page-count">18</biblScope><date type="published" when="2010-08">2010-08</date></imprint><idno type="ISSN">0148-0227</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acap</term><term>American plate reference frame</term><term>American plates</term><term>Anomalous</term><term>Anomalous displacement</term><term>Anomalous displacements</term><term>Anomaly</term><term>Aseismic</term><term>Atmospheric loading</term><term>Boehm</term><term>Brudzinski</term><term>Caya</term><term>Central guerrero</term><term>Central mexico</term><term>Central oaxaca</term><term>Coastal stations</term><term>Cotte</term><term>Cumulative displacement</term><term>Cumulative displacements</term><term>Data gaps</term><term>Dislocation model</term><term>Displacement</term><term>Earth planet</term><term>East component</term><term>Fault plane</term><term>Franco</term><term>Geophys</term><term>Global</term><term>Global pressure</term><term>Global solution</term><term>Grace data</term><term>Guerrero</term><term>Guerrero area</term><term>Guerrero stations</term><term>Guerrero subduction zone</term><term>Horizontal components</term><term>Horizontal displacement</term><term>Horizontal displacements</term><term>Hydrologic</term><term>Hydrological</term><term>Hydrological loading</term><term>Iglesias</term><term>Instantaneous velocity</term><term>Interface</term><term>Kostoglodov</term><term>Large sses</term><term>Larson</term><term>Lett</term><term>Level model</term><term>Loading</term><term>Lowry</term><term>Main phase</term><term>Mapping function</term><term>Mexico city</term><term>Numerical weather models</term><term>Oaxaca</term><term>Oaxaca state</term><term>Oaxaca stations</term><term>Oaxaca subduction zone</term><term>Observation level</term><term>Ocean tide loading</term><term>Pino</term><term>Position estimates</term><term>Position time series</term><term>Processing strategy</term><term>Reference frame</term><term>Schuh</term><term>Seismogenic</term><term>Seismogenic zone</term><term>Silent earthquake</term><term>Singh</term><term>Small sses</term><term>Southern mexico</term><term>Spatiotemporal</term><term>Spatiotemporal evolution</term><term>Spectral analysis</term><term>Ss</term><term>Standard strategy</term><term>Station acap</term><term>Station caya</term><term>Station zihp</term><term>Statistical parameters</term><term>Subduction</term><term>Subduction interface</term><term>Subduction zone</term><term>Surface displacement</term><term>Surface displacements</term><term>Surface loads</term><term>Tectonic</term><term>Time evolution</term><term>Time series</term><term>Transition zone</term><term>Tregoning</term><term>Trench</term><term>Universidad nacional</term><term>Vergnolle</term><term>Vertical component</term><term>Vertical components</term><term>Vertical displacements</term><term>Vertical position time series</term><term>Wrms</term><term>Zihp</term><term>Zone</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Acap</term><term>American plate reference frame</term><term>American plates</term><term>Anomalous</term><term>Anomalous displacement</term><term>Anomalous displacements</term><term>Anomaly</term><term>Aseismic</term><term>Atmospheric loading</term><term>Boehm</term><term>Brudzinski</term><term>Caya</term><term>Central guerrero</term><term>Central mexico</term><term>Central oaxaca</term><term>Coastal stations</term><term>Cotte</term><term>Cumulative displacement</term><term>Cumulative displacements</term><term>Data gaps</term><term>Dislocation model</term><term>Displacement</term><term>Earth planet</term><term>East component</term><term>Fault plane</term><term>Franco</term><term>Geophys</term><term>Global</term><term>Global pressure</term><term>Global solution</term><term>Grace data</term><term>Guerrero</term><term>Guerrero area</term><term>Guerrero stations</term><term>Guerrero subduction zone</term><term>Horizontal components</term><term>Horizontal displacement</term><term>Horizontal displacements</term><term>Hydrologic</term><term>Hydrological</term><term>Hydrological loading</term><term>Iglesias</term><term>Instantaneous velocity</term><term>Interface</term><term>Kostoglodov</term><term>Large sses</term><term>Larson</term><term>Lett</term><term>Level model</term><term>Loading</term><term>Lowry</term><term>Main phase</term><term>Mapping function</term><term>Mexico city</term><term>Numerical weather models</term><term>Oaxaca</term><term>Oaxaca state</term><term>Oaxaca stations</term><term>Oaxaca subduction zone</term><term>Observation level</term><term>Ocean tide loading</term><term>Pino</term><term>Position estimates</term><term>Position time series</term><term>Processing strategy</term><term>Reference frame</term><term>Schuh</term><term>Seismogenic</term><term>Seismogenic zone</term><term>Silent earthquake</term><term>Singh</term><term>Small sses</term><term>Southern mexico</term><term>Spatiotemporal</term><term>Spatiotemporal evolution</term><term>Spectral analysis</term><term>Ss</term><term>Standard strategy</term><term>Station acap</term><term>Station caya</term><term>Station zihp</term><term>Statistical parameters</term><term>Subduction</term><term>Subduction interface</term><term>Subduction zone</term><term>Surface displacement</term><term>Surface displacements</term><term>Surface loads</term><term>Tectonic</term><term>Time evolution</term><term>Time series</term><term>Transition zone</term><term>Tregoning</term><term>Trench</term><term>Universidad nacional</term><term>Vergnolle</term><term>Vertical component</term><term>Vertical components</term><term>Vertical displacements</term><term>Vertical position time series</term><term>Wrms</term><term>Zihp</term><term>Zone</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">The world's largest observed Slow Slip Events (SSE) occurred in 2001–2002 and 2006 in the Guerrero subduction zone, Mexico. Using an improved GPS processing that accounts for time‐varying atmospheric phenomena as well as oceanic, atmospheric and hydrologic loading corrections, the 11 year GPS position time series in Guerrero show a noise reduction of ∼50% with respect to previous studies. Thanks to the improved position time series and, in particular, the simultaneous analysis of the three‐dimensional GPS observations, we can provide new information about SSEs in the studied area. First, we detect seven nonperiodic anomalous displacements with subcentimeter amplitude, but no quasi‐annual anomalies as proposed previously. The displacements seem to occur simultaneously with the observed peaks of non‐volcanic tremor activity in the area. Second, we refine the characteristics of the two major SSEs in terms of timing, duration, and cumulative displacements, and highlight the complex surface spatiotemporal evolution of the displacements during these SSEs. In particular, we observe a clear initiation phase for the 2006 SSE as well as ending phases for both large SSEs. The ending phase shows a strong deceleration of the anomalous displacements with respect to the main displacement phase already observed, for the 2001–2002 and 2006 SSEs. The duration of the SSEs increases by 30–40% including the initiation and ending phases. For the 2006 SSE, the main displacement phase also shows spatiotemporal complexity. Our results demonstrate the need for improved three‐dimensional GPS processing technique in order to undertake detailed studies of SSEs.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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