Hydrogeological Studies to Identify the Trend of Concealed Section of the North Tabriz Fault (Iran)

Ground Water ◽  
2016 ◽  
Vol 55 (3) ◽  
pp. 327-333 ◽  
Author(s):  
Hossein Rajabpour ◽  
Abdorreza Vaezihir
Keyword(s):  
The North ◽  
North Tabriz Fault ◽  
Hydrogeological Studies

scholarly journals Paleoearthquakes and slip rates of the North Tabriz Fault, NW Iran: preliminary results

2009 ◽  
Vol 46 (5) ◽  
Author(s):  
K. Hessami ◽  
D. Pantosti ◽  
H. Tabassi ◽  
E. Shabanian ◽  
M. R. Abbassi ◽  
...  
Keyword(s):  
Slip Rates ◽  
Nw Iran ◽  
Preliminary Results ◽  
The North ◽  
North Tabriz Fault

Triggering of the 2012 Ahar-Varzaghan earthquake doublet (Mw6.5&6.3) by the Sahand Volcano and North Tabriz fault (NW-Iran); Implications on the seismic hazard of Tabriz city

2021 ◽  
Author(s):  
Seyyedmaalek Momeni
Keyword(s):  
Creep Behaviour ◽  
Fluid Pressure ◽  
Fault System ◽  
High Mountain ◽  
Low Velocity ◽  
Nw Iran ◽  
The North ◽  
North Tabriz Fault ◽  
Earthquake Doublet ◽  
Tabriz City

<div><span>Seismic history of the North Tabriz fault (NTF), the main active fault of Northwestern Iran near Tabriz city, and its relation to the Sahand active Volcano (SND), the second high mountain of the NW Iran, and to the 11 August 2012 Ahar-Varzaghan earthquake doublet (Mw6.5&6.3) (AVD), is investigated. I infer that before AVD seismicity of the central segment of NTF close to SND was very low compared to its neighbor segments. Magmatic activities and thermal springs near central NTF close to Bostan-Abad city and low-velocity anomalies reported beneath SND toward NTF in tomography studies suggest that the existing heat due to SND magma chamber has increased the pore-fluid pressure that overcomes the effective normal stress on the central NTF, resulting in its creep behaviour. Two peaks of cumulative scalar seismic moments of earthquakes observed on both lobes of the creeping segment, confirming the strong difference in the deformation rate between these segments. On 2012, AVD struck in the 50 km North of NTF, in the same longitude range to SND and with the same right-lateral strike-slip mechanism to NTF, as a result of partial transfer of the right-lateral deformation of NW Iran toward the North of NTF on the Ahar-Varzaghan fault system. A cumulative aseismic slip equal to an Mw6.8 event is estimated for the creeping segment of NTF, posing half of the 7mmy-1 geodetic deformation has happened in the creep mode. This event has transferred a positive Coulomb stress field of >1 bar on the AVD and triggered them. Also, the western and eastern NTF segments received >4 bar of positive Coulomb stresses from the creeping segment and are probable nucleation locations for future earthquakes on NTF. The observed creep may be the reason for the NTF segmentation during the 1721AD M7.6 and 1780 AD M7.4 historical earthquakes.</span></div>

Interseismic strain accumulation across the North Tabriz Fault (NW Iran) deduced from InSAR time series

2013 ◽  
Vol 66 ◽  
pp. 53-58 ◽  
Author(s):  
Sadra Karimzadeh ◽  
Ziyadin Cakir ◽  
Batuhan Osmanoğlu ◽  
Gina Schmalzle ◽  
Masakatsu Miyajima ◽  
...  
Keyword(s):  
Time Series ◽  
Strain Accumulation ◽  
Nw Iran ◽  
The North ◽  
North Tabriz Fault

scholarly journals Probabilistic Fault Displacement Hazard Analysis for North Tabriz Fault

2021 ◽  
Author(s):  
Mohamadreza Hosseyni ◽  
Habib Rahimi
Keyword(s):  
Return Period ◽  
Hazard Analysis ◽  
Probabilistic Approach ◽  
Surface Displacement ◽  
Return Periods ◽  
Surface Rupture ◽  
Slip Mechanism ◽  
The North ◽  
North Tabriz Fault ◽  
Fault Displacement

Abstract. The probabilistic fault displacement hazard analysis is one of the new methods in estimating the amount of possible displacement in the area at the hazard of causal fault rupture. In this study, using the probabilistic approach and earthquake method introduced by Youngs et al., 2003, the surface displacement of the North Tabriz fault has been investigated, and the possible displacement in different scenarios has been estimated. By considering the strike-slip mechanism of the North Tabriz fault and using the earthquake method, the probability of displacement due to surface ruptures caused by 1721 and 1780 North Tabriz fault earthquakes has been explored. These events were associated with 50 and 60 km of surface rupture, respectively. The 50–60 km long section of the North Tabriz fault was selected as the source of possible surface rupture. We considered two scenarios according to possible displacements, return periods, and magnitudes which are reported in paleoseismic studies of the North Tabriz fault. As the first scenario, possible displacement, return period, and magnitude was selected between zero to 4.5; 645 years and Mw~7.7, respectively. In the second scenario, possible displacement, return period and magnitude were selected between zero to 7.1, 300 years, and Mw~7.3, respectively. For both mentioned scenarios, the probabilistic displacements for the rate of exceedance 5 % in 50, 475, and 2475 years for the principle possible displacements (on fault) of the North Tabriz fault have been estimated. For the first and second scenarios, the maximum probabilistic displacement of the North Tabriz fault at a rate of 5 % in 50 years is estimated to be 186 and 230 cm. Also, mentioned displacements for 5 % exceedance in 475 years and 2475 years in both return periods of 645 and 300 years, are estimated at 469 and 655 cm.

scholarly journals Paleoseismological and morphological evidence of slip rate variations along the North Tabriz fault (NW Iran)

2015 ◽  
Vol 640-641 ◽  
pp. 20-38 ◽  
Author(s):  
Shahryar Solaymani Azad ◽  
Hervé Philip ◽  
Stéphane Dominguez ◽  
Khaled Hessami ◽  
Majid Shahpasandzadeh ◽  
...  
Keyword(s):  
Slip Rate ◽  
Morphological Evidence ◽  
Nw Iran ◽  
The North ◽  
North Tabriz Fault

scholarly journals Geophysical investigations in the Radovna River Spring area (Julian Alps, NW Slovenia)

Geologija ◽  
2021 ◽  
Vol 64 (2) ◽  
pp. 253-266
Author(s):  
Anja TORKAR ◽  
Marjana ZAJC ◽  
Jure ATANACKOV ◽  
Andrej GOSAR ◽  
Mihael BRENČIČ
Keyword(s):  
Groundwater Level ◽  
River Discharge ◽  
Geophysical Methods ◽  
Low Frequency ◽  
The North ◽  
Hydrogeological Parameters ◽  
Seismic Reflection Method ◽  
Julian Alps ◽  
Hydrogeological Studies ◽  
Ground Penetrating

The Radovna River Valley is located in the north-western part of Slovenia in the Julian Alps, where there is an extensive intergranular aquifer whose depth to pre-Quaternary bedrock is unknown. Therefore, to obtain information about the depth of the valley and the geometry of the aquifer two geophysical methods were used in our study; ground penetrating radar (GPR) and seismic reflection method. The low-frequency GPR method has shown to be useful for determining the depth of the groundwater and the predominant groundwater recharge. Also, the high-resolution seismic method provided an insight about the morphology of the pre-Quaternary basement with the deepest point at 141 meters below surface. Measurements of hydrogeological parameters such as groundwater level and river discharge measurements were carried out in the study area. Both data analyses showed that groundwater level and river discharge are highly fluctuating and rapidly changing, indicating a well-permeable aquifer, implying that such an aquifer is extremely sensitive and vulnerable to extreme climate events. Both the geophysical methods and the hydrogeological information have provided important information about the morphology of the valley and the alluvial aquifer, as well as increasing the knowledge about the Radovna springs system, which will contribute very important information for future hydrogeological studies.

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