VELOCITY STRUCTURE OF THE CRUST AND UPPER MANTLE IN TEHRAN REGION USING TRAVEL-TIME CURVES OF THE LOCAL EARTHQUAKES

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JAVADI F.; SIAHKOUHI H.R.

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Journal: Journal of the Earth and Space Physics Year:2000 | Volume:26 | Issue:1 Page(s): 47-60

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Title

VELOCITY STRUCTURE OF THE CRUST AND UPPER MANTLE IN TEHRAN REGION USING TRAVEL-TIME CURVES OF THE LOCAL EARTHQUAKES

Author(s)

JAVADI F. | SIAHKOUHI H.R. | Issue Writer Certificate

Keywords

TRAVEL-TIME CURVEQ4

CRUSTQ4

3-D FORWARD MODELINGQ4

RAY TRACINGQ4

Abstract

Institute of Geophysics has established a digital telemetric seismic network in Tehran region since 1997. Wealth of data from recorded local earthquakes create an opportunity to image CRUST and upper mantle in the region. We proposed to study velocity and interface structure of the CRUST and upper mantle in the Tehran region using local earthquakes. As a first step we obtained a 1-D velocity model by analysis of the TRAVEL-TIME CURVEs for nearly 20000 P-wave arrival times from 2900 local earthquakes. Recorded earthquakes were classified along the five separate profiles, and corresponding TRAVEL-TIME CURVEs were analyzed. In addition, a 3-D RAY TRACING forward modeling code was written in order to refine model parameters. The results indicate a two-layer CRUST in the study area. Compressional wave velocity of the first layer is 6.05 km/s and that of second layer is 7.01 km/s. Depths for Conrad and Moho discontinuities were obtained 16 and 46 km respectively, which well correlates with the results of the previous gravimetric CRUSTal studies. Since, it was difficult to pick arrival time of the direct shear waves, we could not determined the shear wave velocity for the first layer in the CRUST, but it found to be 3.90 and 5.20 km/s for the second layer of the CRUST and the Moho, respectively.

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APA: Copy

JAVADI, F., & SIAHKOUHI, H.R.. (2000). VELOCITY STRUCTURE OF THE CRUST AND UPPER MANTLE IN TEHRAN REGION USING TRAVEL-TIME CURVES OF THE LOCAL EARTHQUAKES. JOURNAL OF THE EARTH AND SPACE PHYSICS, 26(1), 47-60. SID. https://sid.ir/paper/80541/en

Vancouver: Copy

JAVADI F., SIAHKOUHI H.R.. VELOCITY STRUCTURE OF THE CRUST AND UPPER MANTLE IN TEHRAN REGION USING TRAVEL-TIME CURVES OF THE LOCAL EARTHQUAKES. JOURNAL OF THE EARTH AND SPACE PHYSICS[Internet]. 2000;26(1):47-60. Available from: https://sid.ir/paper/80541/en

IEEE: Copy

F. JAVADI, and H.R. SIAHKOUHI, “VELOCITY STRUCTURE OF THE CRUST AND UPPER MANTLE IN TEHRAN REGION USING TRAVEL-TIME CURVES OF THE LOCAL EARTHQUAKES,” JOURNAL OF THE EARTH AND SPACE PHYSICS, vol. 26, no. 1, pp. 47–60, 2000, [Online]. Available: https://sid.ir/paper/80541/en

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