Abstract. The seismogram of a deep earthquake, C050296F, has been analyzed at various stations around the quake’s epicenter, that are HNR, MSVF, CTAO and SNZO, to investigate the S speed structure below the Ontong-Java Plateau (OJP) in Pacific West Equator. The synthetic seismogram is calculated using GEMINI method, whose input consists of PREMAN earth model, the earthquake's CMT solution and coordinates of observation stations. Wave phases namely S, Love and Rayleigh, and depth phases ScS, ScS2 and by the earth surface reflected depth phases are used in this research. The seismogram comparison between the measured and the synthetic shows various discrepancies in values of each azimuth direction of hypocenter. The OJP to southeast has a negative anomaly, which is the same as the previous seismological results in the same area. Southeast to station MSVF, the area of OJP has a positive anomaly, which is different from the result of previous seismological researches. Anomalies occur not only in upper mantle, but also at layers below it, until CMB.
Keywords: seismogram comparison; S wave; S wave velocity structure from the upper mantle down to CMB.
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