A detailed analysis of microseismicity in Samos and Kusadasi (Eastern Aegean Sea) areas     

Onur Tan  Eleftheria E. Papadimitriou  Zumer Pabucçu  Vassilis Karakostas  Ahmet Yörük  Kostas Leptokaropoulos 《Acta Geophysica》2014,62(6):1283-1309

A detailed investigation of microseismicity and fault plane solutions are used to determine the current tectonic activity of the prominent zone of seismicity near Samos Island and Kusadasi Bay. The activation of fault populations in this complex strike-slip and normal faulting system was investigated by using several thousand accurate earthquake locations obtained by applying a double-difference location method and waveform cross-correlation, appropriate for areas with relatively small seismogenic structures. The fault plane solutions, determined by both moment tensor waveform inversions and P-wave first motion polarities, reveal a clear NS trending extension direction, for strike slip, oblique normal and normal faults. The geometry of each segment is quite simple and indicates planar dislocations gently dipping with an average dip of 40–45°, maintaining a constant dip through the entire seismogenic layer, down to 15 km depth.  相似文献   

Seasonal and Spatial Variations of Metals in Melen Watershed Groundwater,Turkey          下载免费PDF全文

Ahmet Çelebi  Bülent Şengörür  Bjørn Kløve 《洁净——土壤、空气、水》2015,43(5):739-745

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Ligand Exchange Chromatography of Nitrophenol Positional Isomers on Co‐CMEDA‐Silica Gel          下载免费PDF全文

Ahmet Ayar 《洁净——土壤、空气、水》2016,44(10):1352-1357

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Crushed recycled glass as a filter medium and comparison with silica sand     

Elif Soyer  Ömer Akgiray  Nursen Öz Eldem  Ahmet Mete Saatçı 《洁净——土壤、空气、水》2010,38(10):927-935

The objective of this work was to evaluate crushed recycled glass as a medium for rapid filtration. In the first part of this work, physical and hydraulic characteristics of the glass medium were studied. In the second part, pilot scale inline filtration experiments were carried out using raw waters from three different water sources. Two physically identical filter columns were operated in parallel in all the experiments. One filter contained a silica sand medium that is widely used in Turkey, whereas the other filter contained crushed recycled glass. Experiments were repeated five times as follows: (i) Without the use of a coagulant, (ii–iii) with 5 mg/L and 10 mg/L of alum, and (iv–v) with 5 mg/L and 10 mg/L of ferric chloride. Turbidity, particle counts, and head losses were measured and compared as functions of time. The following were observed: (1) Provided that a coagulant was used, the filter containing crushed glass produced effluent turbidities and particle counts similar to those obtained with the sand filter. (2) The crushed glass medium generated both a smaller clean‐bed head loss and smaller clogging head losses than those of the sand filter. It is concluded that crushed glass shows significant promise as an alternative to silica sand in rapid filtration.  相似文献   

Elemental abundance analyses with DAO spectrograms – XXI. The hot metallic-lined stars 60 Leonis and 6 Lyrae     

Saul J. Adelman  Hulya Caliskan  Taskin Cay  Dursun Kocer  H. Gokmen Tektanali 《Monthly notices of the Royal Astronomical Society》1999,305(3):591-601

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The QuakeSim Project: Web Services for Managing Geophysical Data and Applications     

Marlon E. Pierce  Geoffrey C. Fox  Mehmet S. Aktas  Galip Aydin  Harshawardhan Gadgil  Zhigang Qi  Ahmet Sayar 《Pure and Applied Geophysics》2008,165(3-4):635-651

We describe our distributed systems research efforts to build the “cyberinfrastructure” components that constitute a geophysical Grid, or more accurately, a Grid of Grids. Service-oriented computing principles are used to build a distributed infrastructure of Web accessible components for accessing data and scientific applications. Our data services fall into two major categories: Archival, database-backed services based around Geographical Information System (GIS) standards from the Open Geospatial Consortium, and streaming services that can be used to filter and route real-time data sources such as Global Positioning System data streams. Execution support services include application execution management services and services for transferring remote files. These data and execution service families are bound together through metadata information and workflow services for service orchestration. Users may access the system through the QuakeSim scientific Web portal, which is built using a portlet component approach.  相似文献   

Elemental abundance analyses with DAO spectrograms – XXIII. The superficially normal stars 28 And (A7 III) and 99 Her (F7 V)     

Saul J. Adelman  †  Hulya Caliskan  Dursun Kocer  ‡  Ipek H. Cay  H. Gokmen Tektunali ‡ 《Monthly notices of the Royal Astronomical Society》2000,316(3):514-518

Elemental abundances of 28 And (A7 III) and 99 Her (F7 V), which have modest rotational velocities, are derived in a manner consistent with previous studies in this series of papers. The values for 28 And, a δ Scuti variable, show that it is slightly metal-poor, but not a classical Am star. 99 Her, which is somewhat more metal-poor, has a rather small microturbulence for its spectral type.  相似文献   

Forward modelling receiver functions for crustal structure beneath station TBZ (Trabzon, Turkey)   总被引：4，自引：0，他引：4  

Özcan Çak&#;r  Murat Erduran  Hakan Ç&#;nar  & Ahmet Y&#;lmaztürk 《Geophysical Journal International》2000,140(2):341-356

We use teleseismic three-component digital data from the Trabzon, Turkey broadband seismic station TBZ to model the crustal structure by the receiver function method. The station is located at a structural transition from continental northeastern Anatolia to the oceanic Black Sea basin. Rocks in the region are of volcanic origin covered by young sediments. By forward modelling the radial receiver functions, we construct 1-D crustal shear velocity models that include a lower crustal low-velocity zone, indicating a partial melt mechanism which may be the source of surfacing magmatic rocks and regional volcanism. Within the top 5 km, velocities increase sharply from about 1.5 to 3.5 km s⁻¹. Such near-surface low velocities are caused by sedimentation, extending from the Black Sea basin. Velocities at around 20 km depth have mantle-like values (about 4.25 km s⁻¹ ), which easily correlate to magmatic rocks cropping out on the surface. At 25 km depth there is a thin low-velocity layer of about 4.0 km s⁻¹. The average Moho velocity is about 4.6 km s⁻¹, and its depth changes from 32 to 40 km. Arrivals on the tangential components indicate that the Moho discontinuity dips approximately southwards, in agreement with the crustal thickening to the south. We searched for the solution of receiver functions around the regional surface wave group velocity inversion results, which helped alleviate the multiple solution problem frequently encountered in receiver function modelling.
Station TBZ is a recently deployed broadband seismic station, and the aim of this study is to report on the analysis of new receiver function data. The analysis of new data in such a structurally complex region provides constraining starting models for future structural studies in the region.  相似文献   

A Review of Research and Development of Wind Energy in Turkey     

Ahmet Duran Sahin 《洁净——土壤、空气、水》2008,36(9):734-742

During the end of the 20^th and the beginning of the 21^st centuries, interest has risen in new and renewable energy sources, and especially wind energy for electricity generation. In a short time, wind energy has been welcomed by society, industry and politicians as a clean, practical, economical and environmentally friendly alternative to existing fossil fuels. As a result of extensive studies on this topic, wind energy has recently been applied in various industries, and has started to compete with other energy resources. Wind energy applications and turbine installations at different scales have increased since the beginning of this millennium. Technically installed wind turbines capacity factors have high values in most areas of Turkey. It is seen that, in general, the modeling of wind speed and its parameters have been studied and researched rather than wind power technological development in Turkey. Wind investors had doubts about uncertainties in the renewable energy policies. After May 2007, an energy efficiency law was accepted and 10 years of electricity generation by renewable sources is considered as guaranteed by the Turkish government. The installed wind power has reached 131.35 MW in Turkey and it is expected that this value will be increased to 808.81 MW by the end of 2008. The dependence of strong technological and economical development on Turkey's energy needs have increased and new national or international sources have to be taken into account for the energy sector of the country. It is clear that this source gap could be filled by using the high potential of wind power, which is estimated at 58 GW. It is expected that installed wind power to supply up to 5% of electricity consumption by 2015 and for the end of 2008 this ratio will increase to 2% (it is currently ca. 1.0%). However, unexpected and unpredicted wind power applications have occurred on November 1^st, 2007 in Turkey. It has been announced that 78,000.00 MW wind power investments have been applied by the Energy Market Regulatory Authority (EMRA). This is a new era for the Turkish energy sector and there is no model for this new situation. Therefore, in this paper, wind energy in Turkey is reviewed and opened up for further discussion.  相似文献   

Exploration of S-wave velocity profiles at strong motion stations in Eskisehir,Turkey, using microtremor phase velocity and S-wave amplification     

Hiroaki Yamanaka  Ögur Tuna Özmen  Kosuke Chimoto  Mehmet Akif Alkan  Muammer Tün  Emrah Pekkan  Oguz Özel  Derya Polat  Murat Nurlu 《Journal of Seismology》2018,22(5):1127-1137

We have explored 1D S-wave velocity profiles of shallow and deep soil layers over a basement at strong motion stations in Eskisehir Province, Turkey. Microtremor array explorations were conducted at eight strong motion stations in the area to know shallow 1D S-wave velocity models. Rayleigh wave phase velocity at a frequency range from 3 to 30 Hz was estimated with the spatial autocorrelation analysis of array records of vertical microtremors at each station. Individual phase velocity was inverted to a shallow S-wave velocity profile. Low-velocity layers were identified at the stations in the basin. Site amplification factors from S-wave parts of earthquake records that had been estimated at the strong motion stations by Yamanaka et al. (2017) were inverted to the S-wave velocities and Q-values of the sedimentary layers. The depths to the basement with an S-wave velocity of 2.2 km/s are about 1 km in the central part of the basin, while the basement becomes shallow as 0.3 km in the marginal part of the basin. We finally discussed the effects of the shallow and deep sedimentary layers on the 1D S-wave amplification characteristics using the revealed profiles. It is found that the shallow soil layers have no significant effects in the amplification at a frequency range lower than 3 Hz in the area.  相似文献