CRUSTAL STRUCTURE BENEATH NORTHWEST IRAN USING TELESEISMIC CONVERTED WAVES

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TAGHIZADEH FARAHMAND F.; SODOUDI F.; GHEITANCHI M.R.; KAVIANI A.

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Journal: GEOSCIENCES Year:2010 | Volume:19 | Issue:74 Page(s): 131-136

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Title

CRUSTAL STRUCTURE BENEATH NORTHWEST IRAN USING TELESEISMIC CONVERTED WAVES

Author(s)

TAGHIZADEH FARAHMAND F. | SODOUDI F. | GHEITANCHI M.R. | KAVIANI A. | Issue Writer Certificate

Keywords

RECEIVER FUNCTION (RF)Q2

SHORT PERIODQ3

CRUSTAL THICKNESSQ3

TELESEISMICQ3

MOHO DISCONTINUITYQ3

VP/VS RATIOQ3

Abstract

We compute p receiver functions (RF) to investigate the CRUSTAL THICKNESS and VP/VS RATIO beneath the northwest of Iran and map out the lateral variation of Moho depth under this region. We selected data from TELESEISMIC events (Mb ³5.5, 30o<D<95o) recorded since 2000 to present at 8 three component SHORT PERIOD stations from Tabriz TELESEISMIC network. RF method is now a well-known tool for studying CRUSTAL THICKNESS when such a complete data set is available. As the p-to-s conversion points at the Moho is laterally close to the stations, the Moho depth estimation is less affected by lateral velocity variations and thus provides a good point measurement. First of all, we calculated RFs for each station and then the Moho depth will be estimated only from the delay time of the Moho p-to-s conversion phases. Then we used an H-Vp/Vs stacking algorithm (Zhu & Kanamori, 2000) to estimate CRUSTAL THICKNESS and VP/VS RATIO under each station from P-to-S converted waves in receiver functions. The best value for H and VP/VS RATIO is found when the three phases (Ps and crustal multiples) are stacked coherently. The average Moho depth is approximately 48 km and varies from 38.5±1 to 53.5±1 km. Deeper and shallower Moho is found under the western and eastern stations beneath SHB and SRB stations respectively. The northwest Iran's crust has an average VP/VS RATIO of 1.76, with higher ratio of 1.82±0.03 in Tabriz station and lower ratio of 1.73±0.03 in Azarshahr station.

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APA: Copy

TAGHIZADEH FARAHMAND, F., SODOUDI, F., GHEITANCHI, M.R., & KAVIANI, A.. (2010). CRUSTAL STRUCTURE BENEATH NORTHWEST IRAN USING TELESEISMIC CONVERTED WAVES. GEOSCIENCES, 19(74), 131-136. SID. https://sid.ir/paper/31639/en

Vancouver: Copy

TAGHIZADEH FARAHMAND F., SODOUDI F., GHEITANCHI M.R., KAVIANI A.. CRUSTAL STRUCTURE BENEATH NORTHWEST IRAN USING TELESEISMIC CONVERTED WAVES. GEOSCIENCES[Internet]. 2010;19(74):131-136. Available from: https://sid.ir/paper/31639/en

IEEE: Copy

F. TAGHIZADEH FARAHMAND, F. SODOUDI, M.R. GHEITANCHI, and A. KAVIANI, “CRUSTAL STRUCTURE BENEATH NORTHWEST IRAN USING TELESEISMIC CONVERTED WAVES,” GEOSCIENCES, vol. 19, no. 74, pp. 131–136, 2010, [Online]. Available: https://sid.ir/paper/31639/en

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