Science Links Japan | Estimation of Underground Structures Beneath Southwest Japan Derived from Receiver Function analysis

Estimation of Underground Structures Beneath Southwest Japan Derived from Receiver Function analysis

Accession number;07A0041914

Title;Estimation of Underground Structures Beneath Southwest Japan Derived from Receiver Function analysis

Author; UENO TOMOTAKE (Kyoto Univ., Disaster Prev. Res. Inst., JPN) SHIBUTANI TAKUO (Kyoto Univ., Disaster Prev. Res. Inst., JPN) ITO KIYOSHI (Kyoto Univ., Disaster Prev. Res. Inst., JPN)

Journal Title;Abstracts for Annuals. Disaster Prevention Research Institute, Kyoto University (CD-ROM)

Journal Code:S0431B

ISSN:

VOL.;NO.49;PAGE.NO.49B,323-330(2006)

Figure&Table&Reference;FIG.7, REF.25

Pub. Country;Japan

Language;Japanese

Abstract;We imaged S wave velocity discontinuities by analyzing Ps converted waves in receiver functions with data from the Joint Seismic Observation of Japan Universities in Southwest Japan. The source area of the 2000 Western Tottori Earthquake is located in the observation area. The Moho discontinuity is clearly imaged in the result. It is possibly deduced that the clear Moho discontinuity in the Shikoku district is the continental Moho discontinuity rather than the oceanic one. Furthermore, earthquakes may occur at the boundary of the Philippine Sea Plate (PHP) or in the oceanic crust rather than in the uppermost mantle of the oceanic plate. The Moho discontinuity is located at -30 km deep in the northern Chugoku district. A discontinuity was also found at -60 km in the region. This discontinuity may be an extension of the PHP. Discontinuities in the crust are intermittent and they seem to be located just below the seismogenic zone. (author abst.)

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