NW Iran-eastern Turkey present-day kinematics: Results from the Iranian permanent GPS network

Djamour, Y.; Vernant, Philippe; Nankali, H.; Tavakoli, F.

doi:10.1016/j.epsl.2011.04.029

Cited by 136 publications

(112 citation statements)

References 31 publications

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“…Figure 5. (a) Precise leveling network (black circles) (NCC, National Cartographic Center) and (b) GPS stations (Djamour et al, 2011) in the area. Figure 6.…”

Section: Results Of the Processing Of Insar And Integration Datamentioning

confidence: 99%

“…We used 13 new survey sites installed on two profiles in the region with an average spacing on the order of 10 km. Since our sites are only survey sites, we use the values determined (Djamour et al 2011) for the continuous GPS in NW of Iran. Finally, velocities and their 1s confidence uncertainties were estimated in ITRF2008 and then the Eurasian reference frame was defined by minimizing the horizontal velocities of IGS stations located in Europe and central Asia (Djamour et al 2011).…”

Section: Data-setmentioning

confidence: 99%

“…Since our sites are only survey sites, we use the values determined (Djamour et al 2011) for the continuous GPS in NW of Iran. Finally, velocities and their 1s confidence uncertainties were estimated in ITRF2008 and then the Eurasian reference frame was defined by minimizing the horizontal velocities of IGS stations located in Europe and central Asia (Djamour et al 2011). Despite the high accuracy in the calculation of horizontal displacement, GPS can't measure vertical displacement with high accuracy.…”

Section: Data-setmentioning

confidence: 99%

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Estimation of north Tabriz fault parameters using neural networks and 3D tropospherically corrected surface displacement field

Haji-Aghajany

Voosoghi

Yazdian

2017

Geomatics, Natural Hazards and Risk

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In this paper, parameters of north Tabriz fault are studied using 3D displacement field and artificial neural networks (ANNs). We provide the 3D surface displacement along the north Tabriz fault using an integration of tropospherically corrected InSAR, GPS and precise levelling data. To perform the InSAR analysis, we use the 17 ENVISAT radar acquisitions. The line of sight (LOS) displacement field was corrected using the ERA-Interim global meteorological reanalysis models. In order to calculate the 3D displacement, we use a Simultaneous and Integrated Strain Tensor Estimation from Geodetic and Satellite Deformation Measurements approach. ANNs used to estimate the parameters. 3D displacement field and ANN algorithm yields an average slip rate of 6.1 § 0.01 mm/year with a locking depth of 13.4 § 0.01 km. This rate is consistent with previous geodetic estimates based on recent global positioning system measurements and InSAR analysis. In addition, the length, width and dip angle of fault are about 101.2 § 0.01 km, 25.06 § 0.03 km and 63 § 0.05 deg. This study demonstrates that interseismic displacement with a sub-centimetre rate can be successfully detected by integration of multi temporal InSAR techniques, GPS and precise leveling data and shows that ANN algorithm is suitable for estimating the parameters of north Tabriz fault.

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“…Figure 5. (a) Precise leveling network (black circles) (NCC, National Cartographic Center) and (b) GPS stations (Djamour et al, 2011) in the area. Figure 6.…”

Section: Results Of the Processing Of Insar And Integration Datamentioning

confidence: 99%

Section: Data-setmentioning

confidence: 99%

Section: Data-setmentioning

confidence: 99%

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Estimation of north Tabriz fault parameters using neural networks and 3D tropospherically corrected surface displacement field

Haji-Aghajany

Voosoghi

Yazdian

2017

Geomatics, Natural Hazards and Risk

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“…GPS vectors at the NTF indicates a mainly north-northeast tectonic movement. Close to Ahar, the average slip (between 1999 and 2009) along the segment is of about 11 mm/year (Djamour et al 2011). Right after the doublet a surface rupture was occurred in the area (Fig.…”

Section: Introductionmentioning

confidence: 99%

Stress Transfere and Statistical Analysis of 2012 Ahar-Varzeghan Seismic Sequnce, Northwestern Iran

Yazdi¹,

Escribano²,

Santoyo³

2017

Proceedings - 1st Congress in Geomatics Engineering - CIGeo

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Abstract:In 11 of August 2012, two destructive earthquakes with Mw= 6.4 and 6.2 occurred between cities Ahar and Varzeghan (Northwest Iran). They had a close epicentral distance of 6 Km and also had a short time lag of 11 minutes. Following that, a high-rate of aftershock activity began where during the first month more than 2000 events (M≥0.7) affected several villages in the area. The seismic released energy induced significant damage and losses in an extensive zone. Right after the seismic doublet occurrence, a surface rupture with a primarily east-west orientation was observed. The idea of having an almost vertically dipped fault plane for the first shock is more consistent with the trace of the upper edge on the surface and the focal mechanism solutions which propose a steady dipping EW. Previous studies propose different geometries for the generating faults of the second earthquake. In this study, we associate the surface rupture with the first mainshock and both nodal plane explaining the relationship between the two main seismic events are discussed after Coulomb failure stress calculation due to the first shock. Then the stress transfer because of the doublet is analyzed in order to determine its consistency with the statistical modeling prediction for the aftershock population and spatial distribution. For statistical modeling a temporal version of Epidemic Type Aftershock Sequence (ETAS) is applied on one-year seismicity including events with minimum magnitude of 2.5. Key words: Statistical Seismology, ETAS, Coulomb Failure stress, IRAN Resumen:Dos terremotos destructivos, de magnitudes Mw=6.4 y 6.2, ocurrieron el 11 de agosto de 2012 entre las ciudades iraníes de Ahar y Varzeghan. Los epicentros se situaron cerca entre sí, a una distancia de 6 km, y con un intervalo temporal de 11 muinutos. La serie de réplicas subsiguiente se desarrollo con una tasa alta, de más de 2000 eventos en el primer mes (M≥0.7). El movimiento sísmico produjo considerable daño y pérdidas en una zona extensa. El primer evento causó una ruptura semi-vertical, consistente con uno de los planos nodales del mecanismo focal y con una ruptura en superficie con orientación este-oeste. En cuanta a la falla causante del segundo evento principal, existen varias hipótesis. En este trabajo se realiza un modelo de transferencia de esfuerzos estáticos de Coulomb debidos al primer evento para delimitar las zonas cargadas de esfuerzos en las que es más plausible que se haya desencadenado el segundo evento principal. Seguidamente, se considera el cambio de esfuerzos producido por los dos eventos a fin de determinar cuales son las zonas cargadas positiva y negativamente de esfuerzos. De forma complementaria, se desarrolla un modelado estadístico de la población de réplicas y su distribución espacial. Se usa la versión temporal del modelo ETAS (Epidemic Type Aftreshock Sequence) para identificar los eventos que son réplicas y se analiza su distribución espacial en relación a la distribución de los incrementos / decrementos de esfuerzos de Coulom...

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“…Tectonically, NW Iran is an intracontinental collision zone, and one of the main features in this region is the North Tabriz Fault accommodating several millimeters per year of right lateral strike slip motion, on the basis of GPS studies (e.g., Vernant et al, 2004;Djamour et al, 2011). NW Iran has been affected by seismic activity during historical and instrumental time periods.…”

Section: Introductionmentioning

confidence: 99%

Spatial-temporal analysis of seismicity before the 2012 Varzeghan, Iran, Mw 6.5 earthquake

Talebi¹,

Zaré²,

Zadeh³

et al. 2015

Turkish J Earth Sci

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NW Iran-eastern Turkey present-day kinematics: Results from the Iranian permanent GPS network

Cited by 136 publications

References 31 publications

Estimation of north Tabriz fault parameters using neural networks and 3D tropospherically corrected surface displacement field

Estimation of north Tabriz fault parameters using neural networks and 3D tropospherically corrected surface displacement field

Stress Transfere and Statistical Analysis of 2012 Ahar-Varzeghan Seismic Sequnce, Northwestern Iran

Spatial-temporal analysis of seismicity before the 2012 Varzeghan, Iran, Mw 6.5 earthquake

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