Paper Information

Title: 

CRUSTAL VELOCITY STRUCTURE OF BINALUD REGION USING TELESEISMIC P WAVE RECEIVER FUNCTIONS

Type: PAPER
Author(s): NOWROUZI G.R.*,PRIESTLEY K.F.,GHAFOURY ASHTIANYA M.,DOLOEIA G.J.
 
 *INTERNATIONAL INSTITUTE OF EARTHQUAKE ENGINEERING AND SEISMOLOGY (IIEES)
 
Name of Seminar: CONFRANCE ZHEOFIZIKE IRAN
Type of Seminar:  CONFERENCE
Sponsor:  ANJOMANE MELI ZHEOFIZIK IRAN
Date:  2006Volume 12
 
 
Abstract: 

THE CRUSTAL STRUCTURE BENEATH THREE SEISMIC STATIONS, DEPLOYED IN TEMPORARY KOPET-DAGH (KD) SEISMIC NETWORK, IN NORTH EASTERN OF IRAN IS DETERMINED USING RECEIVER FUNCTIONS ANALYSIS. IN THIS STUDY, 40 TELESEISMIC EARTHQUAKES THAT WERE RECORDED AT THE STATIONS OF KD NETWORK WERE USED TO CALCULATE RECEIVER FUNCTIONS. BY COMBINING THE RADIAL COMPONENT OF TELESEISMIC P WAVES WITH THE VERTICAL COMPONENT, IT IS POSSIBLE TO IDENTIFY S PHASE WITHIN THE P WAVEFORM. THESE PHASES ARE GENERATED BY THE MECHANISM OF P TO S CONVERSION AT DISCONTINUITIES IN VELOCITY UNDER THE RECEIVING STATION. CRUSTAL STRUCTURE MODELS CAN BE TESTED BY RECEIVER FUNCTIONS GENERATED OF SYNTHETIC SEISMOGRAMS AND COMPARING WITH THE OBSERVED DATA. A COMPLICATED CRUSTAL STRUCTURE IS SUGGESTED FOR THE BINALUD, WITH A MOHO DEPTH OF 52±1 KM THE RESULTS ARE PRESENTING THE THREE MAIN LAYERS: THE UPPER CRUST HAS A S WAVE VELOCITY BETWEEN 2.6–3.6 KM/S AND A 13±1 KM THICKNESS. THE MIDDLE CRUST HAS S WAVE VELOCITY BETWEEN 3.2– 3.9 KM/S AND A 21±1 KM THICKNESS. THE LOWER CRUST HAS S WAVE VELOCITY BETWEEN 3.6 – 4.6 KM/S AND A 18±1KM THICKNESS. THE UPPER CRUST IS DIVIDED TO TWO PARTS. TOP LAYER HAS A POSITIVE SHEAR WAVE VELOCITY GRADIENT FROM 2.6- 3.6 KM/S FROM SURFACE TO A DEPTH OF 7±1 AND BOTTOM LAYER HAS A NEGATIVE SHEAR WAVE VELOCITY GRADIENT FROM 3.6- 3.2 KM/S AND 5KM THICKNESS. THE MIDDLE CRUST ALSO IS DIVIDED TO TWO PARTS. TOP LAYER OF MIDDLE CRUST HAS 9±1 KM THICKNESS AND A 3.2-3.3 KM/S SHEAR WAVE VELOCITY. BOTTOM LAYER OF MIDDLE CRUST HAS 12±1 KM THICKNESS AND 3.4-3.9 KM/S SHEAR WAVE VELOCITY. A S WAVE VELOCITY BETWEEN 4.6– 4.7 KM/S INDICATES THE LOWER CRUST WITH MOHO AT 52±1 KM.

 
Keyword(s): NORTH-EAST OF IRAN, BINALUD, CRUSTAL STRUCTURE, MOHO DISCONTINUITY, RECEIVER FUNCTION, P WAVES
 
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