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dc.contributor.authorMouyen, M.en_US
dc.contributor.authorSimoes, M.en_US
dc.contributor.authorMouthereau, F.en_US
dc.contributor.authorMasson, F.en_US
dc.contributor.authorHwang, C.en_US
dc.contributor.authorCheng, C. -C.en_US
dc.date.accessioned2014-12-08T15:36:33Z-
dc.date.available2014-12-08T15:36:33Z-
dc.date.issued2014-07-01en_US
dc.identifier.issn0956-540Xen_US
dc.identifier.urihttp://dx.doi.org/10.1093/gji/ggu133en_US
dc.identifier.urihttp://hdl.handle.net/11536/24895-
dc.description.abstractWe propose to test if gravimetry can prove useful in discriminating different models of long-term deep crustal processes in the case of the Taiwan mountain belt. We discuss two existing tectonic models that differ in the deep processes proposed to sustain the long-term growth of the orogen. One model assumes underplating of the uppermost Eurasian crust with subduction of the deeper part of the crust into the mantle. The other one suggests the accretion of the whole Eurasian crust above crustal-scale ramps, the lower crust being accreted into the collisional orogen. We compute the temporal gravity changes caused only by long-term rock mass transfers at depth for each of them. We show that the underplating model implies a rate of gravity change of -6 x 10(-2) mu Gal yr(-1), a value that increases to 2 x 10(-2) mu Gal yr(-1) if crustal subduction is neglected. If the accretion of the whole Eurasian crust occurs, a rate of 7 x 10(-2) mu Gal yr(-1) is obtained. The two models tested differ both in signal amplitude and spatial distribution. The yearly gravity changes expected by long-term deep crustal mass processes in Taiwan are two orders of magnitude below the present-day uncertainty of land-based gravity measurements. Assuming that these annually averaged long-term gravity changes will linearly accumulate with ongoing mountain building, multidecadal time-series are needed to identify comparable rates of gravity change. However, as gravity is sensitive to any mass redistribution, effects of short-term processes such as seismicity and surface mass transfers (erosion, sedimentation, ground-water) may prevent from detecting any long-term deep signal. This study indicates that temporal gravity is not appropriate for deciphering the long-term deep crustal processes involved in the Taiwan mountain belt.en_US
dc.language.isoen_USen_US
dc.subjectNumerical approximations and analysisen_US
dc.subjectTime variable gravityen_US
dc.subjectDynamics: gravity and tectonicsen_US
dc.titleInvestigating possible gravity change rates expected from long-term deep crustal processes in Taiwanen_US
dc.typeArticleen_US
dc.identifier.doi10.1093/gji/ggu133en_US
dc.identifier.journalGEOPHYSICAL JOURNAL INTERNATIONALen_US
dc.citation.volume198en_US
dc.citation.issue1en_US
dc.citation.spage187en_US
dc.citation.epage197en_US
dc.contributor.department土木工程學系zh_TW
dc.contributor.departmentDepartment of Civil Engineeringen_US
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