Model P Wave Multipathing at Regional Distances in Southeast Asia

Abstract

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Array Analysis of Regional-Distance P-Coda in South Asia

“…Many previous studies have used seismic arrays to study regional-distance P-coda and in particular to detect later arriving phases associated with upper mantle triplications (Niazi and Anderson, 1965;Johnson, 1967;Simpson et al, 1974;King and Calcagnile, 1976;England et al, 1977;Ram and Mereu, 1977;England et al, 1978;Ram et al, 1978). A comprehensive review of these and related studies is given in Koper and Fatehi (2008). Here we briefly describe wave propagation in the transition zone to determine at what distances and with what properties triplicated phases are most likely to be observed in short-period P-coda.…”

Calibrating the Chiang Mai Seismic Array (CMAR) for Improved Event Location

“…There is a need for calibration at the International Monitoring System array CMAR (Chiang Mai, Thailand). First mentioned by Koch and Kraundofer (1997) and Bondar et al (1999), then by Guilbert et al (2005) and Koper and Fatehi (2008), significant effort was devoted to study-specific, empirical corrections of bias in back-azimuth observed at CMAR. However, even though dipping Mohorovičić discontinuity beneath CMAR was mentioned by Bondar et al, 1999 as a possible explanation of the observed parameter residuals, no further research was devoted to solving this hypothesis.…”