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2nd EAGE International Conference KazGeo
- Conference date: 29 Oct 2012 - 31 Oct 2012
- Location: Almaty, Kazakhstan
- ISBN: 978-90-73834-37-8
- Published: 29 October 2012
81 - 84 of 84 results
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Empirical Spectral Ground Motion Prediction Equations for Iran
Authors F. Mehrabi, N. Mirzaei, H. Hamzehloo and A. MoradiUsing qualified accelerograms of the Iranian Strong Motion Network (ISMN), ground motion prediction equations for 5%-damped elastic response spectral acceleration in the period range of 0 to 3 seconds are developed for the purpose of seismic hazard analysis. The coefficients are included to model the effects of magnitude, source-to-site distance, local site effects and faulting mechanisms on the observed ground motions. Along with comparison to other ground motion models, the validity of the proposed equations is assessed by testing their applicability and investigating the distribution of residuals against the explanatory variables.
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Local Earthquake Tomography in the Central Alboz-Iran to Determining Upper Crust Velocity Anomaly
Authors T. Akbari, H. Shomali and A. TryggvasonSeismic inversion for three-dimensional variations of velocity is often used to delineate velocity anomalies including magma bodies in the crust and upper mantle. A 3-D Vp and Vs model is obtained for the upper crust in the Central Alborz Mountains using the local travel-time earthquake tomography method. About 350 seismic events distributed around Alborz Mountain Ranges from surface down to a depth of about 30 km have been used to elucidate the P and S wave velocity structure. The seismic arrival times are directly inverted using a 1D velocity model as the starting model in the inversion. The simultaneous inversion of hypocentral and velocity model parameters had a remarkable impact on improving the location of the earthquakes. The optimal gridding and regularization parameters are estimated via synthetic modeling. Tomography results show considerable velocity anomaly in Damavand cone nearby the region. Both the P- and S-wave velocities are reduced compared to the surrounding below 10 km depth.
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Variations of Moho Depth in Zagros, Central Iran and Alborz Zones Using P and S Receiver Functions
Authors N. Mohammadi, F. Sodoudi and A. GholamiThe current tectonics of the Iranian plateau resulted from the collision of the Arabian and Eurasian Plates have made different seismotectonic zones with various geological formations within Iranian plateau. The study of the Moho depth variations leads us to determine tectonic setting process in the study region. P and S receiver functions techniques were used in this work as popular methods to detect the Moho depth variations within Iranian plateau. Due to the different deformation zones existed in the study region, our results show significant variations of the Moho beneath the Iranian plateau. Moho depth beneath Central Alborz is observed around 55±2 km, which is interpreted related to the shortening of the collision of Arabian–Eurasian plate. Moho depth decreases to 37±2 km beneath Central Iranian Plateau indicating less affected by the lithospheric thickening resulted from the collision. Our observations depict the increasing of the crustal thickness beneath the UDAM and SSZ zones along the lower latitudes, which implies that the convergent rate increases from NW to SE across the Zagros collision zone.
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Drilling Waste Sub-surface Re-Injection: Worldwide and in CIS
Authors S.M. Gumarov, T.A. Shokanov, P.V. Khudorozhkov, L. Mcleod and D.V. Blyusrill cuttings, waste mud, brine, oily drains, pits residuals, etc. is generated. This waste is required to be disposed in a responsible and environmentally friendly manner. Over the years, environmental regulations governing the disposal of such waste have tightened and each day regulatory agencies are demanding more stringent policies, especially for remote and environmentally sensitive areas. As a solution for drilling waste management in expanding offshore operations, in early 1990’s, a process of sub-surface disposal via high pressure injecting above the disposal formation’s fracture gradient emerged. While the technique was called differently in different countries and literature – Waste Injection (WI), Cuttings Re-Injection (CRI), DCI (Drill Cuttings Injections), SFI (Slurry Fracture Injection) – the common essence has been creating hydraulic fractures in the selected disposal formation to accommodate solids and while liquids leaked-off into formation. This paper describes the technology in brief and reviews history of its emerging and global implementation as well as discusses risks and historical failures. The second part of the paper is devoted to WI projects in CIS region and sub-surface assurance practices applied by M-I SWACO.
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