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<identifier>oai:HAL:hal-00486367v1</identifier>
<datestamp>2018-01-11</datestamp>
<setSpec>type:ART</setSpec>
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<setSpec>subject:phys</setSpec>
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<title lang=en>Remarks on the relationship between the tectonic regime, the rake of the slip vectors, the dip of the nodal planes, and the plunges of the P, B, and T axes of earthquake focal mechanisms</title>
<creator>Celerier, Bernard</creator>
<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>
<source>ISSN: 0040-1951</source>
<source>EISSN: 1879-3266</source>
<source>Tectonophysics</source>
<publisher>Elsevier</publisher>
<identifier>hal-00486367</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00486367</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00486367</source>
<source>Tectonophysics, Elsevier, 2010, 482 (1-4), pp.42-49. 〈10.1016/j.tecto.2009.03.006〉</source>
<identifier>DOI : 10.1016/j.tecto.2009.03.006</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2009.03.006</relation>
<language>en</language>
<subject lang=en>T axes</subject>
<subject lang=en>Slip rake</subject>
<subject lang=en>Nodal planes</subject>
<subject lang=en>Focal mechanisms</subject>
<subject lang=en>Tectonic regime</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We use a triangular representation of the plunges of P, B, and Taxes to compare the different ways tectonic regime is inferred from earthquake focal mechanisms in recent works. We argue that P, B, and Taxes provide a reasonable estimate of principal stress directions when faulting is close to Andersonian conditions, and that this can be estimated from the location on a triangular diagram. We analyze the geometrical relationship between the plunges of P, B, and Taxes on one hand, and the rake of slip and dip of nodal planes on the other hand. We show that the rake and dip level curves correspond to trajectories of the vertical direction along great and small circles with respect to the frame of the P, B. and Taxes. This shows that dip-slip faulting is compatible with vertical P or Taxes, but does not require it, and instead requires horizontal B axes. It also shows that strike-slip faulting does not require vertical B axes, but P and Taxes with equal plunges. This also reveals that focal mechanisms where P, B, and Taxes all have moderate plunge correspond to two very different types of nodal planes: a steeply dipping one with oblique slip and a moderately dipping one with strike-slip. Seismically active and moderately dipping strike-slip faults are to be found among these events.</description>
<date>2010</date>
</dc>
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