Low-velocity zone atop the 410-km seismic discontinuity in the northwestern United States T.-R.A. Song, D.V. Helmberger, S.P. Grand Nature 427, 2004 Pei-Ying.

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Presentation transcript:

Low-velocity zone atop the 410-km seismic discontinuity in the northwestern United States T.-R.A. Song, D.V. Helmberger, S.P. Grand Nature 427, 2004 Pei-Ying Patty Lin Earthscope Seminar, Feb.12, 2007

DATA Song et al., Nature 427, 530 (2004). XL XK XM TriNet

Method Song et al., Nature 427, 530 (2004).

Profile A(d:14~17 o ) Song et al., Nature 427, 530 (2004). Thickness of LVZ(km) Topography depression(km) TriNet

Triplication curves Song et al., Nature 427, 530 (2004). record section B record section A

Profile C,F,D,E(d:21~24 o ) Song et al., Nature 427, 530 (2004). H of LVZ(km) Topo (km)

Results Song et al., Nature 427, 530 (2004). Patches: White: no detected LVZ Red with dashed outline: a possible LVZ Red with solid outline: clear LVZ dots: (receiver functions) White: no negative pulse above 410 and relative strong simple 410 peaks Red: strong negative pulse above o ~115 o W 41.5 o 40.2 o 116 o ~114 o W 38.9 o 37.5 o Preferred model 20~90 km thick with 5% S-wave velocity reduction

Interpretation Bercovici and Karato, Nature 425, 39 (2003). high Water solubility low Water solubility low Water solubility

Additional Thoughts  Which one is the best-fit velocity model?  A  LVZ atop the 410 exists in some regions but may be too thin to be detected.  Is there a possibility of detecting the LVZ with short-period data?