Options
Shabanian, E.
Loading...
4 results
Now showing 1 - 4 of 4
- PublicationOpen AccessPaleoearthquakes and slip rates of the North Tabriz Fault, NW Iran: preliminary results(2003)
; ; ; ; ; ; ; ;Hessami, K.; International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran ;Pantosti, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Tabassi, H.; International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran ;Shabanian, E.; International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran ;Abbassi, M. R.; International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran ;Feghhi, K.; International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran ;Solaymani, S.; International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran; ; ; ; ; ; The North Tabriz Fault is a major seismogenic fault in NW Iran. The last damaging earthquakes on this fault occurred in 1721, rupturing the southeastern fault segment, and in 1780, rupturing the northwestern one. The understanding of the seismic behavior of this fault is critical for assessing the hazard in Tabriz, one of the major cities of Iran; the city suffered major damage in both the 1721 and 1780 events. Our study area is located on the northwestern fault segment, west of the city of Tabriz. We performed geomorphic and trenching investigations, which allowed us to recognize evidence for repeated faulting events since the Late Pleistocene. From the trenches, we found evidence for at least four events during the past 3.6 ka, the most recent one being the 1780 earthquake. On the basis of different approaches, horizontal slip per event and slip rates are found in the ranges of 4 ± 0.5 m and 3.1-6.4 mm/yr, respectively. We also attempted an estimate of the average recurrence intervals which appears to be in the range 350-1430 years, with a mean recurrence interval of 821 ± 176 years. On the basis of these results, the northwestern segment of the North Tabriz Fault does not appear to present a major seismic potential for the near future, however, not enough is known about the southeastern segment of the fault to make a comparable conclusion.461 3051 - PublicationRestrictedThe south Zagros suture zone in teleseismic images(2017)
; ; ; ; ; ; ; ; ;The geometry of intra-continental lithosphere boundaries along the Zagros orogenic belt in the Arabia-Eurasia collision is investigated bymeans of teleseismic data. The data are gathered over a seismic linear profile extending across south Zagros, the Sanandaj–Sirjan metamorphic zone, the Urumieh–Dokhtar magmatic arc, Central Iran, and the Kopeh Dagh - Binalud mountains. We exploit the P and S receiver functions leading tomap the geometry of the crustal and subcrustal interfaces. The migrated depth sections reveal an abrupt crustal thickening and a gentle crustal thinning ~60km north and ~30 kmsouth of the Zagros suture, respectively. Associated to the buckled antiformalMoho south of the suture, a deeper synform in the lithospheric lid of the lower Arabia plate is shown by migrated depth sections affecting the lithospheric mantle of the Arabia plate beneath the suture zone. This geometry implies an unexpected intra-lid decoupling. These features imply that the Central Iran lithosphere acts as a relatively strong backstop producing significant internal deformation expressed by shortening and thickening at the edge of the Arabian lithosphere. The 410 km and 660 km transition zones are imaged by P to S converted phases and showed lateral continuity implying an originally lowdip angle subduction of the oceanic Arabian plate beneath Central Iran.78 1 - PublicationRestrictedNew kinematic constraints of the western Doruneh fault, north-eastern Iran, from interseismic deformation analysis(2012-05-21)
; ; ; ; ; ; ; ;Pezzo, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Tolomei, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Atzori, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Salvi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Shabanian, E.; CEREGE - AIX-MARSEILLE UNIVERSITE ;Bellier, O.; CEREGE - AIX-MARSEILLE UNIVERSITE ;Farbod, Y.; CEREGE - AIX-MARSEILLE UNIVERSITE; ; ; ; ; ; We used the SBAS DInSAR analysis technique to estimate the interseismic deformation along the western part of the Doruneh fault system (DFS), northeastern Iran. We processed 90 ENVISAT images from four different frames from ascending and descending orbits. Three of the ground velocity maps show a significant interseismic signal. Using a simple dislocation approach we model 2-D velocity profiles concerning three InSAR data set relative to the western part of the DFS, obtaining a good fit to the observations. The resulting model indicates that a slip rate of ∼5mmyr−1 accumulates on the fault below 10 km depth, and that in its western sector the Doruneh fault is not purely strike-slip (left-lateral) as in its central part, but shows a significant thrust component. Based on published geological observations, and assuming that all interseismic deformation is recovered with a single event, we can estimate a characteristic recurrence interval between 630 and 1400 yr.241 25 - PublicationOpen AccessCrustal scale imaging of the Arabia – Central Iran collision boundary across the Zagros suture zone, west of Iran(2020-04)
; ; ; ; ; ; ; ; ; ; ; ; ; We calculate seismic velocity structure of the north Zagros suture zone, west Iran, to resolve the crustal features at the boundary of Arabian – Central Iranian collision. We compute teleseismic receiver functions (RFs) for 46 stations along a transect crossing the suture. Through harmonic analysis and inversion of the RF data, we obtain information on the characteristics of the suture zone at depth. The RFs and their harmonics show a low angle NE dipping boundary between the overriding layer and a mid‐crustal low velocity zone which corresponds to the suture zone. The overriding high velocity feature (Vs~3.8 km/s) is interpreted as an intermediate depth crustal complex exhumed close to the surface through imbricate thrust faulting and enhanced by crustal buoyancy due to continental underthrusting. Significant anisotropy is found above and below the suture zone: we interpret it in terms of slow‐symmetry‐axis anisotropy and derive clues on the ongoing deformation processes.146 47