Erratum to: Lithospheric structure of NW Iran from P and S receiver functions |
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| Authors: | Fataneh Taghizadeh-Farahmand Forough Sodoudi Narges Afsari Mohammad R Ghassemi |
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| Institution: | (1) Department of Physics, Qom Branch, Islamic Azad University, Qom, Iran;(2) Helmholtz Center Potsdam, GFZ Research Center for Geosciences, Telegrafenberg 14473, Potsdam, Germany;(3) Department of Physics, Islamshahr Branch, Islamic Azad University, Tehran, Iran;(4) Research Institute for Earth Sciences, Geological Survey of Iran, Azadi Sq., Meraj Ave., P.O.Box: 13185-1494, Tehran, Iran |
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| Abstract: | We computed P and S receiver functions to investigate the lithospheric structure beneath the northwest Iran and compute the
Vp/Vs ratio within the crust of this seismologically active area. Our results enabled us to map the lateral variations of
the Moho as well as those of the lithosphere–asthenosphere boundary (LAB) beneath this region. We selected data from teleseismic
events (Mb > 5.5, epicentral distance between 30° and 95° for P receiver functions and Mb > 5.7, epicentral distance between 60° and 85° for S receiver functions) recorded from 1995 to 2008 at 8 three-component
short-period stations of Tabriz Telemetry Seismic Network. Our results obtained from P receiver functions indicate clear conversions
at the Moho boundary. The Moho depth was firstly estimated from the delay time of the Moho converted phase relative to the
direct P wave. Then we used the H-Vp/Vs stacking algorithm of Zhu and Kanamori to estimate the crustal thickness and Vp/Vs
ratio underneath the stations with clear Moho multiples. We found an average Moho depth of 48 km, which varies between 38.5
and 53 km. The Moho boundary showed a significant deepening towards east and north. This may reveal a crustal thickening towards
northeast possibly due to the collision between the Central Iran and South Caspian plates. The obtained average Vp/Vs ratio
was estimated to be 1.76, which varies between 1.73 and 1.82. The crustal structure was also determined by modeling of P receiver
functions. We obtained a three-layered model for the crust beneath this area. The thickness of the layers is estimated to
be 6–11, 18–35, and 38–53 km, respectively. The average of the shear wave velocity was calculated to be 3.4 km/s in the crust
and reaches 4.3 km/s below the Moho discontinuity. The crustal thickness values obtained from P receiver functions are in
good agreement with those derived by S receiver functions. In addition, clear conversions with negative polarity were observed
at ~8.7 s in S receiver functions, which could be related to the conversion at the LAB. This may show a relatively thin continental
lithosphere of about 85 km implying that the lithosphere was influenced by various geodynamical reworking processes in the
past. |
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