High resolution receiver function imaging of the seismic velocity discontinuities in the crust and the uppermost mantle beneath southwest Japan

Yamauchi, Makiko; Hirahara, Kazuro; Shibutani, Takuo

doi:10.1186/bf03352463

Cited by 72 publications

(73 citation statements)

References 8 publications

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“…Site locations are indicated along the top of the figure. Location of the Conrad discontinuity and the upper surface of the PHS slab, which were defined by Yamauchi et al (2003) based on a receiver function analysis, are indicated by thick and thin dashed lines, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…In interpreting such features of the obtained conductivity model, it is useful to compare them with the results of seismological studies. Yamauchi et al (2003) imaged seismicvelocity discontinuities in the crust and uppermost mantle beneath SWJ based on a receiver function analysis. They showed that the upper surface of the PHS slab is located at depths of ∼30 and ∼60 km beneath the southern tip of the Kii Peninsula and northern end of our transect, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Details of the measurements performed at the temporal station can be found in Kasaya et al (2003). (Yamauchi et al, 2003), and the dash-dot line Y-Y indicates the eastern boundary of the area in which high-3 He/ 4 He well gas (> twice the air value of 1.4 × 10 −6 ) is observed (Matsumoto et al, 2003). Black and gray circles indicate the Sites used and not used for the 2-D analysis, respectively (see also Fig.…”

Section: Mt Response Functionsmentioning

confidence: 99%

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Modification of the Network-MT method and its first application in imaging the deep conductivity structure beneath the Kii Peninsula, southwestern Japan

et al. 2009

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The Network-Magnetotelluric (NMT) method is well-suited for investigating deep and large-scale conductivity structure; however, application of the method is strongly dependent on the availability of telecommunication facilities (specifically, metallic transmission cables). To overcome the problem posed by the progressive replacement of metallic transmission cables with fiber cables, we developed a modified NMT (modified NMT) method consisting of purpose-built electrodes, making use of local metallic telecommunication lines, without a transmission cable. We first applied this modified NMT method over the Kii Peninsula, southwestern Japan, undertaking two-dimensional conductivity modeling along a transect across the central part of the peninsula. The model is characterized by a large (∼20 km wide and depths of 10-60 km) and highly conductive (<10 m) zone in the central part of the peninsula between the Conrad discontinuity and the upper surface of the Philippine Sea slab. This zone contains the hypocenters of many deep low-frequency tremors but regular earthquakes are rare. The zone also corresponds to a high-V p /V s area. The presence of fluid in the zone plays a key role in the absence of regular earthquakes, occurrence of deep low-frequency tremors, and elevated V p /V s values, as well as enhancing conductivity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Mt Response Functionsmentioning

confidence: 99%

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Modification of the Network-MT method and its first application in imaging the deep conductivity structure beneath the Kii Peninsula, southwestern Japan

et al. 2009

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“…We used a cell size of 1×1×10 km and two widths of ±40 km and ±100 km from the line of the cross-section. See Yamauchi et al (2003) and Tonegawa et al (2005) for a detailed explanation of the above analysis. Figure 6 shows the stacked RFs applied 0.16-Hz lowpass filter for the profile A-A shown in Fig.…”

Section: Stacked Rf Image In Cross-sectionmentioning

confidence: 99%

Upper mantle imaging beneath the Japan Islands by Hi-net tiltmeter recordings

et al. 2006

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We present a novel receiver-function image of the upper mantle structure around the Japan subduction zone. To increase the amount of available waveform data containing the relatively lower frequency component, we examined whether the Hi-net tiltmeter recordings are usable for imaging the upper mantle discontinuities by comparing them with broadband seismograms in different frequency bands. We found that the two are comparable at a frequency band between 0.02 and 0.16 Hz. To make receiver functions from tiltmeter data, stacked vertical components of broadband seismograms were used as source-time functions. Since such source-time functions may include biases from local structure, we also produced regional stacked source-time functions. The receiver function with the above frequency band does not seem to be affected by local structure. In the images derived from the receiver-function gathers, we were able to visualize both the oceanic Moho and the lower slab boundary, which could be traced down to depths of 400 km and 600 km, respectively. These images also show an uplift of the 410-km discontinuity and a depression of the 660-km discontinuity in the regions that are probably affected by the cold subducting Pacific slab.

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“…Also, Nakanishi (1980) suggested there was an aseismic PHS slab in western Chugoku by analyzing ScSp phases. Yamauchi et al (2003) and Shiomi et al (2004) obtained depth contour maps of the PHS slab in southwest Japan by receiver function analyses for the recent seismic network data. They interpreted the PHS slab image as the oceanic Moho discontinuity of the PHS plate.…”

Section: Introductionmentioning

confidence: 99%

Subsurface structures derived from receiver function analysis and relation to hypocenter distributions in the region from the eastern Shikoku to the northern Chugoku districts, Southwest Japan

2008

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We carried out receiver function imaging to estimate detailed configurations of the Philippine Sea (PHS) slab beneath the Shikoku and Chugoku districts and crustal structures in the region. We used two temporary seismic arrays with an average station spacing of about 10 km in the Chugoku district. Beneath Shikoku a clear northward dipping discontinuity at about 20-40 km depth was found, with other discontinuities below. We present a new interpretation that the clear boundary corresponds to the under surface of a low velocity layer in the upper part of the PHS slab. We also found a discontinuity at about 60 km depth beneath the Chugoku district, which is thought to be the aseismic PHS slab. Small scale discontinuities were found in the crust beneath the source area of the 2000 western Tottori Earthquake and around the Median Tectonic Line. The discontinuities might relate to the occurrence of large inland earthquakes.

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High resolution receiver function imaging of the seismic velocity discontinuities in the crust and the uppermost mantle beneath southwest Japan

Cited by 72 publications

References 8 publications

Modification of the Network-MT method and its first application in imaging the deep conductivity structure beneath the Kii Peninsula, southwestern Japan

Modification of the Network-MT method and its first application in imaging the deep conductivity structure beneath the Kii Peninsula, southwestern Japan

Upper mantle imaging beneath the Japan Islands by Hi-net tiltmeter recordings

Subsurface structures derived from receiver function analysis and relation to hypocenter distributions in the region from the eastern Shikoku to the northern Chugoku districts, Southwest Japan

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