SKS/SKKS splitting and Taiwan orogeny
We determine 58 sets of splitting parameters, fast direction (φ) and delay time (δt), from broadband SKS/SKKS waves recorded at temporary and permanent stations in Taiwan. These and earlier results, from S and ScS as well as SKS, show an island‐wide pattern of φ alignment with N–NNE structural trend...
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| Veröffentlicht in: | Geophysical research letters 2009-06, Vol.36 (12), p.n/a |
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| creator | Kuo-Chen, Hao Wu, Francis T. Okaya, David Huang, Bor-Shouh Liang, Wen-Tzong |
| description | We determine 58 sets of splitting parameters, fast direction (φ) and delay time (δt), from broadband SKS/SKKS waves recorded at temporary and permanent stations in Taiwan. These and earlier results, from S and ScS as well as SKS, show an island‐wide pattern of φ alignment with N–NNE structural trends in southern and central Taiwan and then turn smoothly to EW following the structural bight in northern Taiwan. Remarkable differences in δt for eastern and southwestern events are found, resulting probably from a more anisotropic upper mantle in the east, under the Central Range. With δt an average of 1.3 seconds our observations are consistent with the hypothesis that the orogeny involves shear or flow in the upper mantle in central and southern Taiwan. In northern Taiwan, near the ends of the collision and subduction zones, the extrusion and the hydration of olivine may contribute to the orientation of φ. |
| doi_str_mv | 10.1029/2009GL038148 |
| format | Article |
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These and earlier results, from S and ScS as well as SKS, show an island‐wide pattern of φ alignment with N–NNE structural trends in southern and central Taiwan and then turn smoothly to EW following the structural bight in northern Taiwan. Remarkable differences in δt for eastern and southwestern events are found, resulting probably from a more anisotropic upper mantle in the east, under the Central Range. With δt an average of 1.3 seconds our observations are consistent with the hypothesis that the orogeny involves shear or flow in the upper mantle in central and southern Taiwan. 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Res. Lett</addtitle><description>We determine 58 sets of splitting parameters, fast direction (φ) and delay time (δt), from broadband SKS/SKKS waves recorded at temporary and permanent stations in Taiwan. These and earlier results, from S and ScS as well as SKS, show an island‐wide pattern of φ alignment with N–NNE structural trends in southern and central Taiwan and then turn smoothly to EW following the structural bight in northern Taiwan. Remarkable differences in δt for eastern and southwestern events are found, resulting probably from a more anisotropic upper mantle in the east, under the Central Range. With δt an average of 1.3 seconds our observations are consistent with the hypothesis that the orogeny involves shear or flow in the upper mantle in central and southern Taiwan. 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Res. Lett</addtitle><date>2009-06</date><risdate>2009</risdate><volume>36</volume><issue>12</issue><epage>n/a</epage><issn>0094-8276</issn><eissn>1944-8007</eissn><coden>GPRLAJ</coden><abstract>We determine 58 sets of splitting parameters, fast direction (φ) and delay time (δt), from broadband SKS/SKKS waves recorded at temporary and permanent stations in Taiwan. These and earlier results, from S and ScS as well as SKS, show an island‐wide pattern of φ alignment with N–NNE structural trends in southern and central Taiwan and then turn smoothly to EW following the structural bight in northern Taiwan. Remarkable differences in δt for eastern and southwestern events are found, resulting probably from a more anisotropic upper mantle in the east, under the Central Range. With δt an average of 1.3 seconds our observations are consistent with the hypothesis that the orogeny involves shear or flow in the upper mantle in central and southern Taiwan. In northern Taiwan, near the ends of the collision and subduction zones, the extrusion and the hydration of olivine may contribute to the orientation of φ.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2009GL038148</doi><tpages>5</tpages></addata></record> |
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| subjects | Continental dynamics Earth sciences Earth, ocean, space Exact sciences and technology Orogeny plate boundary Plate tectonics seismic anistropy Taiwan orogeny Upper mantle |
| title | SKS/SKKS splitting and Taiwan orogeny |
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