Microseismicity and seismotectonics of the Firuzkuh and Astaneh faults (East Alborz, Iran)

Nemati, Majid; Hatzfeld, Denis; Gheitanchi, Mohammad Reza; Sadidkhouy, A.; Mirzaei, Noorbakhsh

doi:10.1016/j.tecto.2011.04.007

Cited by 27 publications

(10 citation statements)

References 32 publications

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“…In fact, using a regional velocity model to localize the events leads to high, inacceptable rms values (acceptable values being commonly considered as <0.30 s; e.g. Hatzfeld et al, 2000;Nemati et al, 2011). Therefore, we selected a local velocity model with the aim of minimizing rms values.…”

Section: Seismotectonic Settingmentioning

confidence: 99%

Active tectonics of the outer northern Apennines: Adriatic vs. Po Plain seismicity and stress fields

Mazzoli

Santini

Macchiavelli

et al. 2015

Journal of Geodynamics

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Section: Seismotectonic Settingmentioning

confidence: 99%

Active tectonics of the outer northern Apennines: Adriatic vs. Po Plain seismicity and stress fields

Mazzoli

Santini

Macchiavelli

et al. 2015

Journal of Geodynamics

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“…However, the interaction between the asymmetric “V” shape structure of Central Alborz and the rotational motion of the South Caspian Basin relative to Eurasia produces a more complex velocity field [ Djamour et al , 2010]. At the southern side of the Alborz, left‐lateral faulting is well documented by focal mechanisms of earthquakes within both the western part, along WNW‐striking faults, such as the Mosha Fault [e.g., Hedayati et al , 1976; Jackson et al , 2002; Ashtari et al , 2005], and the eastern part of Central Alborz along NE‐striking Firuzkuh and Astaneh faults [ Nemati et al , 2011] (Figure 11a). This left‐lateral kinematics is also supported by tectonic geomorphology [e.g., Trifonov et al , 1996; Allen et al , 2003b; Hessami et al , 2003; Ritz et al , 2003; Solaymani et al , 2003; Bachmanov et al , 2004; Solaymani Azad et al , 2011b] and InSAR [ Shirzaei et al , 2011] investigations carried out along the Mosha Fault, Taleghan and Firuzkuh faults [ Nazari , 2006; Nazari et al , 2009], and the Shahrud fault system comprising the Astaneh Fault [ Hollingsworth et al , 2010; Javidfakhr et al , 2011b] (Figure 11b).…”

Section: Overview Of the Tectono‐magmatic Features Of Ararat And Damamentioning

confidence: 99%

“…As reported above, Damavand is located at the junction between two distinct (eastern and western) tectonic domains (Figures 11a, 11b, and 11d). At this boundary, predominant shortening in the western transpressional regime [e.g., Tatar et al , 2007; Djamour et al , 2010] turns into an eastern transtensional regime, with NE‐trending left‐lateral faulting [e.g., Jackson et al , 2002; Nazari , 2006; Nemati et al , 2011]. The boundary between the two domains is parallel to the regional NE‐SW σ 1 stress axis [ Abbassi and Shabanian , 1999; Abbassi et al , 2003; Zanchi et al , 2006; Abbassi and Farbod , 2009; Javidfakhr et al , 2011a] and to the relative block motion between the South Caspian Basin and Central Iran [ Djamour et al , 2010].…”

Section: Overview Of the Tectono‐magmatic Features Of Ararat And Damamentioning

confidence: 99%

Structural control on volcanism in intraplate post collisional settings: Late Cenozoic to Quaternary examples of Iran and Eastern Turkey

Shabanian¹,

Acocella²,

Gioncada³

et al. 2012

Tectonics

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[1] Volcanic activity focuses along plate boundaries. However, large volcanoes are also found in intraplate settings. For these volcanoes, geodynamic processes responsible for magma generation and structural controls on magma rise and extrusion need to be evaluated. We merge original (field and remote sensing) and available (geodetic, geophysical, and petrological) data to consider the tectono-magmatic relationships of three large intraplate volcanoes in the E-Anatolian-Iranian plateau; Sar'akhor (NE Iran), Damavand (Central Alborz) and Ararat (E Anatolia). In NE Iran, a Miocene-Pliocene NW-trending compression activated E-W dextral faults to the NW of Sar'akhor and N-S sinistral faults to the SE, creating an extruding wedge to the west of this volcano. Since Quaternary, NE-trending compression inverted fault movement, hindering further block extrusion and volcanism terminated. The adakitic composition of the Sar'akhor rocks suggests post-collisional melting of oceanic slab and/or mafic lower crust, possibly triggered by an asthenospheric rise after slab break-off or intramantle delamination. For the active Damavand and Ararat volcanoes, available data suggest magma generation due to rising hot asthenosphere, following lithospheric delamination or slab break-off in a transtensional environment. The features common to Sar'akhor, Damavand and Ararat allow proposing a model, where transtension focuses the rise of magma in intraplate settings overlying hot asthenosphere produced by delamination or slab break-off.

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“…Previous studies have shownthat earthquakes that occur in the Zagros can also be located within the ~10 km width sedimentary cover(Mcquarrie 2004). Recent studies show that sedimentary cover could also be seismic (e.g Nemati et al 2011(Hatzfeld et al 2010).…”

mentioning

confidence: 99%

“…5, 6,[10][11][12][13][14][15] shows dominant reverse mechanisms in accordance to the related local fault systems in their locations. Event #10 displayed a reverse mechanism related to HZF (NW-SE) with a small right lateral motion.…”

mentioning

confidence: 99%

The November 2021 Fin (SE Zagros, Iran) doublet earthquakes of reverse faults in a transpressional tectonic regime

Nemati

2022

Preprint

Self Cite

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Doublet earthquakes with magnitudes of 6.2 (12:07) and 6.3 (12:08 GMT) on December 14, 2021 struck the SE Zagros in the range of the Mountain Frontal Fault (MFF) in south of Iran. By combining and processing the records of the seismic networks, mechanism of some of background seismicity and the aftershocks were solved and Coulomb stress maps of epicentral area were drawn. Reverse mechanism with a small strike slip component in some earthquakes were dominant, if north dipping E-W oriented plane is the active plane. Statistical investigation of the earthquakes parameters demonstrated that no considerable seismic gap was seen before the first mainshock. The 12:08 Fin earthquake, like other Mountain Frontal Fault dependent earthquakes, is associated with the probable development of anticlines in its vicinity, which is accompanied by a faulting process in and around the core. A small area of fractures with a maximum length of hundred meters and few centimeters opening were seen in the nearest main road. No coseismic mature fault related to this magnitude was observed in prospecting in high quality satellite images. The coulomb stress field revealed that the second shock and majority of aftershocks happened in area of increased stress produced by the first mainshock and second earthquake, respectively. Dimension and strike of coseismic rupture of the second event are estimated ~50 km and near ENE-WSW, respectively using both aftershocks elongation and special-temporal diagram of micro earthquakes. Northward directivity was seen for both shocks in their accelerograms of northeast and south of the epicenters. If MFF fault is supposed as causative fault for the second shock, second rupture was probability propagated from the south to the north, unilaterally. Based on northward dipping of the MFF, the rupture of second event could propagate from shallow depth (10 km, hypocenter) toward deep area (12 km, centroid) of the fault along N-S direction. If causative faults of the shocks are back thrusts, the first rupture should be south dipping, and propagate from depth (20 km, hypocenter) toward surface (13 km, centroid) in N-S direction.

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Microseismicity and seismotectonics of the Firuzkuh and Astaneh faults (East Alborz, Iran)

Cited by 27 publications

References 32 publications

Active tectonics of the outer northern Apennines: Adriatic vs. Po Plain seismicity and stress fields

Active tectonics of the outer northern Apennines: Adriatic vs. Po Plain seismicity and stress fields

Structural control on volcanism in intraplate post collisional settings: Late Cenozoic to Quaternary examples of Iran and Eastern Turkey

The November 2021 Fin (SE Zagros, Iran) doublet earthquakes of reverse faults in a transpressional tectonic regime

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