THE VELOCITY STRUCTURE OF THE NORTH OF IRAN FROM SEISMIC TRAVEL TIMES

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RIAZI RAD Z.S.; JAVAN DOLOEI G.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2009 | Volume:19 | Issue:73 (GEOLOGY ISSUE) Page(s): 163-175

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Title

THE VELOCITY STRUCTURE OF THE NORTH OF IRAN FROM SEISMIC TRAVEL TIMES

Author(s)

RIAZI RAD Z.S. | JAVAN DOLOEI G. | Issue Writer Certificate

Keywords

VELOCITY STRUCTUREQ3

ALBORZQ3

TRAVEL TIMEQ3

Abstract

Introduction: Body and Surfer waves have been produced with earthquake. So that regional seismic Networks have been recorded all local events. TRAVEL TIME of body waves, between source and stations, to be used for crustal study and Joint Inversion modeling.Aim: TRAVEL TIMEs of earthquakes between sources and stations in the north of Iran are used to develop P- and S-wave velocity models across southern Caspian. Errors in TRAVEL TIMEs are minimized using sources for which locations and origin times are constrained by local data (Sari Network).Material and Methods: The method at this survey base on recorded earthquake in the seismic network, North of Iran. There are the minimum errors of the TRAVEL TIME for local data. The body waves do exist with avalute in the Sari seismic four stations. So that, the TRAVEL TIME curves have been calculated for crustal (Pg, Sg) and Mantel (Pn, Sn) waves. Then we can evaluate the velocity of the wave, with use of modeling of body wave. This study determined Conrad and Moho discontinue depth.Results: Apparent velocities are calculated between 10 and 150 km for P (6.25 km/sec) and S (3.55 km/sec). The value of velocity for P (8.05 km/sec) and S (4.71 km/sec) are calculated in distance ranges of 200-1000 km, which is correspond to depth of Conrad discontinuity, 17-18 km. Moho discontinuity is determined to be at a depth of 36-40 km.Conclusion: We use times from stations in Sari north of Iran and published local summary times as a guide for interpretation at greater ranges. Allowing for known differences in local travel-time residuals between the southern and northern of Iran, the P times are best fit by a model that has a small velocity forward at the base of the crust, and the S times are best fit by a model with a more substantial reduction in velocities. Both P- and S-wave traveltimes are concordant with global averages such as the 1-D earth model AK135. Thus, the velocities inferred beneath the crust are relatively low than those of the crust but not necessarily low relative to global averages.

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APA: Copy

RIAZI RAD, Z.S., & JAVAN DOLOEI, G.. (2009). THE VELOCITY STRUCTURE OF THE NORTH OF IRAN FROM SEISMIC TRAVEL TIMES. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 19(73 (GEOLOGY ISSUE)), 163-175. SID. https://sid.ir/paper/70299/en

Vancouver: Copy

RIAZI RAD Z.S., JAVAN DOLOEI G.. THE VELOCITY STRUCTURE OF THE NORTH OF IRAN FROM SEISMIC TRAVEL TIMES. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2009;19(73 (GEOLOGY ISSUE)):163-175. Available from: https://sid.ir/paper/70299/en

IEEE: Copy

Z.S. RIAZI RAD, and G. JAVAN DOLOEI, “THE VELOCITY STRUCTURE OF THE NORTH OF IRAN FROM SEISMIC TRAVEL TIMES,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 19, no. 73 (GEOLOGY ISSUE), pp. 163–175, 2009, [Online]. Available: https://sid.ir/paper/70299/en

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