Ahmad Rashidi

International Institute of Earthquake Engineering and Seismology | iiees

In this study, the active tectonics, paleoseismicity, and seismic hazards of the Doroud Fault are examined through high-resolution satellite image interpretations, field investigations, outcrop and trench excavations, and the dating of geochronology samples. The Doroud Fault (DF), one of the essential segments of the Main Recent Fault in the northe...

This study examines the evidence and effects of young tectonic activities based on the calculation of vertical changes in folds and thrusts in the western part of the Horst Shotori. Quantitative analyses of vertical changes in the western part of the Shotori and the study of factors affecting the extent of these changes have been the objectives of...

This research assessed stress regimes and fields in eastern Iran using fault-slip data and the tectonic events associated with these changes. Our stress analysis of the brittle structures in the Shekarab Mountains revealed significant changes in stress regimes from the late Cretaceous to the Quaternary. Reconstructing stress fields using the age an...

The opposite-sense fault block rotation across the continental strike-slip faulting plays an important role in accommodating crustal deformation in the north of the East Iran orogen. This research constrains the post-Neogene kinematics of the NW-SE to E-W left-lateral transpressional zones at the northern termination of the N-S striking right-later...

In this paper, faults, one of the most important causes of geohazards, were investigated from a kinematic and geometric viewpoint in the northern part of the Sistan suture zone (SSZ), which serves as the boundary between the Afghan and Lut blocks. Furthermore, field evidence was analyzed in order to assess the structural type and deformation mechan...

This study provides a multi-disciplinary overview of the seismology and geodetic data with tectonics analysis in order to provide an evaluation of stress trajectories, and probabilistic fault rupture hazard assessment. Based on the different scenarios obtained from the comparison of several overviews and their interpretation, we investigated the ki...

Earth fissure structures are a common type of geohazard associated with geotechnical surface ruptures that can occur almost anywhere on the ground surface due to a variety of different mechanisms, and in most cases, these hazardous cracks have resulted in severe damage to infrastructure. Investigation of the structural characteristics of fissures i...

Geodetic and seismological data are crucial for examining the kinematics and active tectonics in structural zones. The current tectonic stress field can be inferred from the focal mechanism stress inversion (FMSI) and the seismic and geodetic strain rates (SSR and GSR). In this study, a reliable focal mechanism solution for earthquakes from 1968 to...

Interferometric Synthetic Aperture Radar (InSAR) monitors surface change and displacement over a large area with millimeter-level precision and meter-level resolution. Anar fault, with a length of ~200 km, is located in central Iran. Recent seismological studies on the fault indicated that it is approaching the end of its seismic cycle. Although a...

Geometric-kinematic characteristics of the Khazar fault, roughly 600 km long along the North Alborz- South Caspian boundary, are investigated using field evidence and satellite images. The fault trace along the strike and the fault zone architecture has been determined. This study indicates the northern margin of the Alborz mountains is complicated...

We used satellite images, earthquake catalogues and field observations to study several active fault systems and their interactions in Sabzevaran Area in SE Iran. The focus of this study is to verify the link between the active faults, their kinematics and seismic activity. Field observations and geomorphological analysis highlight the interaction...

Three moderate earthquakes on 1 and 12 December 2017 with MN magnitudes of 6.0–6.1 (MS1, MS2 and MS3) occurred in the SE Iran. They happened in the area between Nayband and Kuh Banan fault systems, NE of the Kerman metropolice. We combined satellite imagery, seismicity, focal mechanism solutions, strong motions, and Coulomb stress to investigate th...

The active tectonic deformation and hazardous earthquakes in the south and west of the Lut block have been investigated for a long time. In this study, we compute the geodetic and seismic strain rates using focal mechanism data from the Harvard CMT catalogue and various other sources including the published GPS velocities. Moreover, we also perform...

A triplet of M w ∼6 earthquakes on 2017 December 1-12 occurred ∼50 km north of Kerman, Iran, in an area of mountainous topography where several major right-lateral strike-slip fault systems - the Gowk, Nayband, Lakar Kuh and Kuh Banan faults - converge. Here we assess their source parameters and surficial expression using regional and teleseismic w...

The Khazar fault in the northern part of the Alborz mountains has changed the topography by making an obvious terrace in which along that the mountain drainage lines is ended where it is impossible to observe the geology structures due to the severe erosion and massive vegetation. Simultaneous of the strike-slip and thrust movements, parallel to th...

Morphotectonic evidences in the southern part of Anar fault show a high risk of seismicity. In this area, Anar fault located in the plain (Anar plain). Due to activity of the fault tilting of the young rock units, trace of active fault, folds with different strick in axial surface, fault scarps, pressure zones and etc are created in the area. Young...

The East of Kerman lies in vicinity of the SAHEB ALZAMAN mountain range and severely faulted. Fault of SAHEB ALZAMAN Mountain is not unique and composed of two fault segment. In the case of re-rupturing of these faults a serious disaster, perhaps financial and life losses may be occurred. Therefore revision of suitable building and observation of b...

The East of Kerman lies in vicinity of the SAHEB ALZAMAN mountain range and severely faulted. Fault of SAHEB ALZAMAN Mountain is not unique and composed of two fault segment. In the case of re-rupturing of these faults a serious disaster, perhaps financial and life losses may be occurred. Therefore revision of suitable building and observation of b...

In the S,W Lut Block, Geodetic Moment Rate is more than Seismic Moment Rate. In this area, Geodetic and Seismic moment rates are respectively: 1.07E+19 Nm.yr, 1.54E+18 Nm.yr. Maximum seismic moment rate was along the Gowk, Shahdad, Bam, Kahourak, Kuhbanan and Behabad. These faults are responsible for large earthquakes in the study area. Southern br...

The area to the W-SW of the Lut Block in Iran has experienced numerous historical and recent destructive earthquakes. We examined a number of faults in this area that have high potential for generating destructive earthquakes. In this study a number of faults are introduced and named for the first time. These new faults are Takdar, Dehno, Suru, Hoj...

This research show that the age of diapirs formation is upper Jurassic (Kimerijian age). Ravar salts are related to the lower parts of the limestones that have pektens and the cover rocks are the upper and middel parts of the limestones facies. Thickness of these facies (350 m) and compression on the east of Iran (due to rifting of East Iran, show...

In the South and West Lut block; Dynamic parameters of the earthquakes and geodetic moment rate (during 2006-2015) indicates interseismic deformation and risk of seismicity in this area. By studieng more than 280 frequency records of 28 earthquakes; moment magnitude (Mw) is between 3.7 to 6.4, seismic moment is between 4.16869E + 14 (Nm) to 5.01187...

Geotourism, as a species of sustainable tourism, seeking to use the Geological and geomorphological landforms attractions to economic and social development and sustainable development in the local community. To achieve this aim, Geotourism evaluates collection of scientific criteria, conservation and tourism and formulateplanning for sustainable d...

In the S,W Lut Block, geodetic moment rate is more than seismic and geological moment rates. Depending on the type of deformation and geometry of the faults, the study area divided to the 4 parts : northern, central, southern and southeastern (South Lut Block) parts. Values of three types of moment rates in these area are comparing with each other....

Based on, different mechanisms of earthquakes, type of deformation and geometry of the faults, the study area divided to 4 parts : North, Central, South and southeast (South Lut Block). Values of three types of moment rates in these regions are comparing with each other. Seismic moment rate in the Central part is 5.62316E+17 Nm.yr, Southeast part i...

Study structural elements in Lardgarm area show a region of sinistral shearـcompresional. Direction of late maximum stress that applied to the area is southwest (S40W). This regime created open space so that hydrothermal solutions followed them and cased magnezite veins. Magnezite veins formed in direction of σ1 , but also crated in faults, tension...

Geomorphic evidence in the study area shows a very high tectonic activity. This study show the major active faults that so far have not been reported. Active earthquake faults that are causing earthquakes include Anjirak, Dehno, Halilroud, Hyderabad, Hojatabad, Jabalebarez, Khatonabad, Kuhesuzgazi, North Faryab, South Faryab, North Kahnoj, Abbasaba...

In Kamarhaji mountain, NW Birjand there are geological structures such as: Duplex, Pop-Up, Triangle zone, Flower structures, Folding and etc. Duplexes in Kamarhaji mountain have east-west trend. Duplexes are parallel to the Shekarab fault system. Shekarab fault is a reverse fault with sinistral component That located is in the southern of area, It...

In Kamarhaji mountain, NW Birjand, there are folds with different geometry and axial surface. Folds are seen in rock units Et,Mr. These rock have been folding in compressional shear zones and have formed of the anticline and syncline that have been together, them have different axial surface. Dip slip faulting with strike-slip displacement caused l...

In the Kamarhaji mountain, there are various structural elements such as folds with of different geometry and mechanism. According to the analysis made, the amount of shortening in this part of the Sistan suture zone, studied in different direction. In the survey as far as was possible, have been harvest all parameters related to folding and cross...

Nayband, Kalmard, Ferdows faults are seismic sources in study area. Fracture intensity maps show the high intensity of fractures in the Northern(Location of connection Kalmard V doruneh faults) part, West(Location of connection Kalmard V Nayband faults) and SouthEast(Ferdows fault) parts. Rose diagram shows that faults are growthing with Azimuth No...

Petrology of rain thousand mountain include volcanic rocks(lava and pyroclastic) and the sedimentary rocks. Lava of view the field include different kinds of intermediate until basic(andesit-basalitic, basalt andesit , basalt). Pyroclastic deposits including volcanic bresh and volcanic sandstone rocks and sedimentary rock and limestone. Alteration...

In the Kamarhaji area in Northwest of Birjand there are structural elements such as: Duplex,Pop-Up,Triangle zone. Structural elements were created in rock units of Et,Eo ab,Mr. They are parallel to the Shekarab fault system. Shekarab fault is a revers fault system with sinstral component. That is located in the south of study area, it is considered...