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<title lang=en>Upper mantle anisotropy beneath Australia and Tahiti from P wave polarization: Implications for real-time earthquake location</title>
<creator>Fontaine, Fabrice, </creator>
<creator>Barruol, Guilhem</creator>
<creator>Kennett, Brian, </creator>
<creator>Bokelmann, Goetz, </creator>
<creator>Reymond, Dominique, </creator>
<contributor>Laboratoire GéoSciences Réunion (LGSR) ; Université de la Réunion (UR) - Institut de Physique du Globe de Paris</contributor>
<contributor>Laboratoire Terre et Océan ; Université de la Polynésie Française (UPF)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Research School of Earth Sciences [Canberra] (RSES) ; Australian National University (ANU)</contributor>
<contributor>Laboratoire de Détection et de Géophysique ; Commissariat à l’Energie Atomique</contributor>
<description>International audience</description>
<source>ISSN: 2169-9313</source>
<source>EISSN: 2169-9356</source>
<source>Journal of Geophysical Research : Solid Earth</source>
<publisher>American Geophysical Union</publisher>
<identifier>hal-01389113</identifier>
<identifier>http://hal.univ-reunion.fr/hal-01389113</identifier>
<identifier>http://hal.univ-reunion.fr/hal-01389113/document</identifier>
<identifier>http://hal.univ-reunion.fr/hal-01389113/file/Fontaine_Ppol_JGR2009.pdf</identifier>
<source>http://hal.univ-reunion.fr/hal-01389113</source>
<source>Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2009, 114 (B3), pp.B03306. 〈10.1029/2008JB005709〉</source>
<identifier>DOI : 10.1029/2008JB005709</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1029/2008JB005709</relation>
<language>en</language>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We report measurements of long-period P wave polarization (P pol) in Australia and Tahiti made by combining modeling of the polarization deviation and harmonic analysis. The analysis of the deviation of the horizontal polarization of the P wave as a function of event back azimuth may be used to obtain information about (1) sensor misorientation, (2) dipping discontinuities, (3) seismic anisotropy, and (4) velocity heterogeneities beneath a seismic station. The results from harmonic analysis and a grid search using Snell's law suggest the presence of a dipping seismic discontinuity beneath stations CTAO and CAN in Australia. These results are consistent with published receiver function studies for these stations. The P pol fast axis orientation is close to the N–S absolute plate motion direction at station TAU (Tasmania), which may be due to plate-motion-driven alignment of olivine crystals in the asthenosphere. Interestingly, measurements of SKS splitting at Tahiti (French Polynesia) show an apparent isotropy, whereas an inversion of P pol observations at PPTL seismic station located in Tahiti suggests the presence of two anisotropic layers. The fast axis azimuth is oriented E–W in the upper layer, and it is close to the NW–SE orientation in the lower layer. Since P pol orientations are used for real-time earthquake locations, especially in poorly instrumented areas such as the South Pacific, we show that the bias from anisotropy and sensor misorientation determined here can be corrected to improve the location accuracy, which yields fundamental data for rapid location necessary for effective tsunami warning.</description>
<date>2009</date>
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