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 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

Recent and active deformation in the North Evia domain, a diffuse plate boundary between Eurasia and Aegean plates in the Western termination of the North Anatolian Fault. 

2021 ◽  
Author(s):  
Fabien Caroir ◽  
Frank Chanier ◽  
Virginie Gaullier ◽  
Julien Bailleul ◽  
Agnès Maillard-Lenoir ◽  
...  
Keyword(s):  
Fault Zone ◽  
Plate Boundary ◽  
Fault Zones ◽  
North Anatolian Fault ◽  
Fault System ◽  
Eurasian Plate ◽  
Slip Rates ◽  
The North ◽  
South West ◽  
North Aegean

<p>The Anatolia-Aegean microplate is currently extruding toward the South and the South-West. This extrusion is classically attributed to the southward retreat of the Aegean subduction zone together with the northward displacement of the Arabian plate. The displacement of Aegean-Anatolian block relative to Eurasia is accommodated by dextral motion along the North Anatolian Fault (NAF), with current slip rates of about 20 mm/yr. The NAF is propagating westward within the North Aegean domain where it gets separated into two main branches, one of them bordering the North Aegean Trough (NAT). This particular context is responsible for dextral and normal stress regimes between the Aegean plate and the Eurasian plate. South-West of the NAT, there is no identified major faults in the continuity of the NAF major branch and the plate boundary deformation is apparently distributed within a wide domain. This area is characterised by slip rates of 20 to 25 mm/yr relative to Eurasian plate but also by clockwise rotation of about 10° since ca 4 Myr. It constitutes a major extensional area involving three large rift basins: the Corinth Gulf, the Almiros Basin and the Sperchios-North Evia Gulf. The latter develops in the axis of the western termination of the NAT, and is therefore a key area to understand the present-day dynamics and the evolution of deformation within this diffuse plate boundary area.</p><p>Our study is mainly based on new structural data from field analysis and from very high resolution seismic reflexion profiles (Sparker 50-300 Joules) acquired during the WATER survey in July-August 2017 onboard the R/V “Téthys II”, but also on existing data on recent to active tectonics (i.e. earthquakes distribution, focal mechanisms, GPS data, etc.). The results from our new marine data emphasize the structural organisation and the evolution of the deformation within the North Evia region, SW of the NAT.</p><p>The combination of our structural analysis (offshore and onshore data) with available data on active/recent deformation led us to define several structural domains within the North Evia region, at the western termination of the North Anatolian Fault. The North Evia Gulf shows four main fault zones, among them the Central Basin Fault Zone (CBFZ) which is obliquely cross-cutting the rift basin and represents the continuity of the onshore Kamena Vourla - Arkitsa Fault System (KVAFS). Other major fault zones, such as the Aedipsos Politika Fault System (APFS) and the Melouna Fault Zone (MFZ) played an important role in the rift initiation but evolved recently with a left-lateral strike-slip motion. Moreover, our seismic dataset allowed to identify several faults in the Skopelos Basin including a large NW-dipping fault which affects the bathymetry and shows an important total vertical offset (>300m). Finally, we propose an update of the deformation pattern in the North Evia region including two lineaments with dextral motion that extend southwestward the North Anatolian Fault system into the Oreoi Channel and the Skopelos Basin. Moreover, the North Evia Gulf domain is dominated by active N-S extension and sinistral reactivation of former large normal faults.</p>

Heat Events in the Indian Subcontinent under a warming climate scenario: Detection and its Drivers 

2021 ◽  
Author(s):  
Ritika Kapoor ◽  
Carmen Alvarez-Castro ◽  
Enrico Scoccimarro ◽  
Stefano Materia ◽  
Silvio Gualdi
Keyword(s):  
North Atlantic ◽  
Heat Waves ◽  
Heat Index ◽  
World Population ◽  
Western Coast ◽  
Positive Correlation ◽  
Preliminary Results ◽  
The North ◽  
The North Atlantic ◽  
Heat Events

<p>Rising global temperatures are a potential cause for increase of extreme climate events, such as heat waves, both in severity and frequency. Under an increasing extreme event scenario, the world population of mid- and low-latitude countries is more vulnerable to heat related mortality and morbidity.</p><p>In India, the events occurred in recent years have made this vulnerability clear, since the numbers of heat-related deaths are on a rise, and heat waves can impact various sectors including health, agriculture, ecosystems and the national economy.</p><p>Preliminary results show the prevalence of heat events in seven different regions of India during the pre-monsoon (March, April, May) and transitional (May, June, July) months. We consider daily maximum temperatures (Tmax) and the NOAA’s Heat Index (HI), a combination of temperature and relative humidity that gives an insight into the discomfort because of increment in humidity.</p><p>We look into various drivers behind the heat events in the seven different clusters, in particular ENSO and the North Atlantic Regimes that have been linked to the generation of heat waves in different parts of India. The preliminary results indicate Nino 3.4 SST anomalies show positive correlation with Tmax anomalies only in the western coast during pre-monsoon season, while in the transitional months positive correlation extends to central and east India. The Tmax composite anomalies for the cold, warm and neutral phases of ENSO show positive anomalies for only warm years and negative anomalies for the cool and neutral years. Heat Index shows similar spatial patterns for correlation analysis and composite anomaly analysis. The Mean Sea Level Pressure (MSLP) composite associated with heat waves (days exceeding 95th percentile=>3 days) show a persistent ridge over the North Atlantic region.</p><p> </p>

Archaeological works to the north of the Great Amun temple at Jebel Barkal (Sudan): preliminary results and new perspectives

2021 ◽  
pp. 36
Author(s):  
Maxim A. Lebedev
Keyword(s):  
Archaeological Research ◽  
Surrounding Area ◽  
Preliminary Results ◽  
The North ◽  
Actual Nature ◽  
Political Center ◽  
History Of ◽  
Field Season ◽  
Special Mention ◽  
The Temple

The paper presents preliminary results and discusses future perspectives on archaeological research in the area to the north of the Great Amun temple at Jebel Barkal (Napata) in connection to the most recent excavations of elite Meroitic structure B 1700. The field season of 2020 at B 1700 continued to bring to light a new monumental foundation platform of the cellular type constructed for a building which function and meaning remain a subject for debate. The now available data suggest that B 1700 followed the classic Meroitic square plan with rooms arranged around a central columned space, utility chambers on the ground floor, and official areas on the upper floor(s). Paper discusses general features of the exposed plan of B 1700, the process of its construction, recorded archaeological matrix, and finds. Special mention is made of the brick masonry, earlier occupation phase, later activities at the site, and the great pottery dump which was extensively used in the fill of the foundation platform. The author argues that elite building B 1700 was probably constructed at the time of king Natakamani (1 century AD) – one of the most known Kushite rulers of the Classic Meroitic period – and did not continue functioning for more than, probably, one century. The study of B 1700 and its surrounding area has a considerable significance for reconstructing the history of the development of the temple and royal zone to the north of the temenos of the Great Amun temple at Jebel Barkal as well as provide new data on the actual nature of Napata as an economic and political center of Meroitic Kush.  

scholarly journals Variations of the martian CO2 abundance with Martian season

1971 ◽  
Vol 40 ◽  
pp. 196-202
Author(s):  
Edwin S. Barker
Keyword(s):  
Growth Parameters ◽  
Polar Cap ◽  
Preliminary Results ◽  
Regression Curves ◽  
The North ◽  
Partial Pressures ◽  
North Polar

All previous published equivalent widths of the Martian CO2 bands including the 1967 apparition coverage at McDonald Observatory are reduced to CO2 abundances using the same curve of growth parameters. The corresponding CO2 partial pressures (assuming a pure CO2 atmosphere), along with the regression curves of the north polar cap, are presented as functions of Martian heliocentric longitudes, Ls. A correlation is noted between the maximum CO2 abundance and minimum north cap diameter and the decrease in CO2 abundance when the northern polar haze begins to reform. Preliminary results of the 1969 apparition coverage at McDonald Observatory are also presented.

THE ROLE OF AMPLITUDE VERSUS OFFSET TECHNOLOGY IN PROMOTING OFFSHORE PETROLEUM EXPLORATION IN AUSTRALIA

2007 ◽  
Vol 47 (1) ◽  
pp. 163 ◽  
Author(s):  
P. E. Williamson ◽  
F. Kroh
Keyword(s):  
Petroleum Exploration ◽  
Gas Field ◽  
North West ◽  
Preliminary Results ◽  
Exmouth Plateau ◽  
The North ◽  
Amplitude Versus Offset ◽  
Cable Lines ◽  
The Cost ◽  
Amplitude Versus

Amplitude versus offset (AVO) technology has proved itself useful in petroleum exploration in various parts of the world, particularly for gas exploration. To determine if modern AVO compliant processing could identify potential anomalies for exploration of open acreage offshore Australia, Geoscience Australia reprocessed parts of four publicly available long cable lines. These lines cover two 2006 acreage release areas on the Exmouth Plateau and in the Browse Basin on the North West Shelf. An earlier study has also been done on two publicly available long cable lines from Geoscience Australia’s Bremer Basin study and cover areas from the 2005 frontier acreage release on the southern margin. The preliminary results from these three reprocessing efforts produced AVO anomalies and were made publicly available to assist companies interested in assessing the acreage. The results of the studies and associated data are available from Geoscience Australia at the cost of transfer.The AVO data from the Exmouth Plateau show AVO anomalies including one that appears to be at the Jurassic level of the reservoir in the Jansz/Io supergiant gas field in adjacent acreage to the north. The AVO data from the Caswell Sub-basin of the Browse Basin show an AVO anomaly at or near the stratigraphic zone of the Brecknock South–1 gas discovery to the north. The geological settings of strata possibly relating to two AVO anomalies in the undrilled Bremer Basin are in the Early Cretaceous section, where lacustrine sandstones are known to occur. The AVO anomalies from the three studies are kilometres in length along the seismic lines.These preliminary results from Geoscience Australiaand other AVO work that has been carried out by industry show promise that AVO compliant processing has value—particularly for gas exploration offshore Australia—and that publicly available long-cable data can be suitable for AVO analysis.

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