Three-dimensional image of the anisotropic bodies beneath central Honshu, Japan

Details Three-dimensional image of the anisotropic bodies beneath central Honshu, Japan Three-dimensional image of the anisotropic bodies beneath central Honshu, Japan

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.135..801h&link_type=abstract

Geophysical Journal International, Volume 135, Issue 3, pp. 801-816.

Astronomy and Astrophysics

Astronomy

6

Anisotropy, Cracks, Mantle, S Waves

Scientific paper

Shear-wave splitting from local deep earthquakes is investigated to clarify the volume and the location of two anisotropic bodies in the mantle wedge beneath central Honshu, Japan. We observe a spatial variation in splitting parameters depending on the combination of sources and receivers, nearly N-S fast in the northern region, nearly E-W fast in the southern region and small time delays in the eastern region. Using forward modelling, two models with 30 and 10 per cent anisotropy are tested by means of a global search for the locations of anisotropic bodies with various volumes. The optimum model is obtained for 30 per cent anisotropy, which means a 5 per cent velocity difference between fast and slow polarized waves. The northern anisotropic body has a volume of 1.00° (longitude) × 0.5° (latitude) × 75 km (depth), with the orientation of the symmetry axis being N20°E. The southern anisotropic body has a volume of 1.25° × 1.25° × 100 km with the symmetry axis along N95°E. Our results show that the anisotropic bodies are located in low-velocity and low-Q regions of the mantle. This, together with petrological data and the location of volcanoes in the arc, suggests that the possible cause of the anisotropy is the preferred alignment of cracks filled with melt.

Affiliated with

Also associated with

No associations

Rating

Three-dimensional image of the anisotropic bodies beneath central Honshu, Japan does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Three-dimensional image of the anisotropic bodies beneath central Honshu, Japan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Three-dimensional image of the anisotropic bodies beneath central Honshu, Japan will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1292004