1-D VELOCITY MODEL FOR CENTRAL ALBORZ REVEALED FROM LOCAL EARTHQUAKE DATA

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JAFARIZADEH MOHAMMAD REZA; GHEITANCHI MOHAMMAD REZA

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Journal: JOURNAL OF THE EARTH Year:2011 | Volume:5 | Issue:4 Page(s): 139-155

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Title

1-D VELOCITY MODEL FOR CENTRAL ALBORZ REVEALED FROM LOCAL EARTHQUAKE DATA

Author(s)

JAFARIZADEH MOHAMMAD REZA | GHEITANCHI MOHAMMAD REZA | Issue Writer Certificate

Keywords

TOMOGRAPHYQ2

CRUSTAL VELOCITY STRUCTUREQ2

SEISMOTECTONICS OF CENTRAL ALBORZQ3

Abstract

The Central Alborz is located in a range of active faulting and deformation running mostly along the southern part of the Caspian Sea.Central Alborz is the convergence point of the eastern and the western parts of the Alborz Mountains where great earthquakes have made a lot of fatalities. The events recorded have been used to estimate, crustal thickness, Moho depth and its geometry in the Central Alborz.1-D inversion so-called "minimum 1-D model" defined as the 1-D velocity model with station corrections and hypocenter parameters that minimizes the RMS residual of the full data set.Initial data are the phase arrival times of P and S waves from 11529 events, consisting of local events, from 1996 to 2006 recorded at 18 stations in central Alborz. From the set of recorted events, 3450 of them selected with RMS less than 0.5 s and ERH and ERZ smaller that 5 km and a maximum gap of 180 degree. In data selecting process, only those events are selected that include at least 10 P-wave observations and 6 S-wave observations. This restricted the data set to 648 events. In this study, we present 1D minimum P and S velocity model of the central Alborz using VELEST program. In our calculations each model is splited into 16 layers between 3 km over the sea level and 56 km depth. With a Moho located at 44 km depth, Maximal investigated depth is 60 km. Separate P and S waves velocity models has been determined. The new models show overall improvement in locations in comparison with previous models.

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APA: Copy

JAFARIZADEH, MOHAMMAD REZA, & GHEITANCHI, MOHAMMAD REZA. (2011). 1-D VELOCITY MODEL FOR CENTRAL ALBORZ REVEALED FROM LOCAL EARTHQUAKE DATA. JOURNAL OF THE EARTH, 5(4), 139-155. SID. https://sid.ir/paper/192908/en

Vancouver: Copy

JAFARIZADEH MOHAMMAD REZA, GHEITANCHI MOHAMMAD REZA. 1-D VELOCITY MODEL FOR CENTRAL ALBORZ REVEALED FROM LOCAL EARTHQUAKE DATA. JOURNAL OF THE EARTH[Internet]. 2011;5(4):139-155. Available from: https://sid.ir/paper/192908/en

IEEE: Copy

MOHAMMAD REZA JAFARIZADEH, and MOHAMMAD REZA GHEITANCHI, “1-D VELOCITY MODEL FOR CENTRAL ALBORZ REVEALED FROM LOCAL EARTHQUAKE DATA,” JOURNAL OF THE EARTH, vol. 5, no. 4, pp. 139–155, 2011, [Online]. Available: https://sid.ir/paper/192908/en

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