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- Earthquake (3)
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Articles 1 - 16 of 16
Full-Text Articles in Physical Sciences and Mathematics
Preface, Erhan Altunel, Serdar Akyüz
Preface, Erhan Altunel, Serdar Akyüz
Turkish Journal of Earth Sciences
No abstract provided.
Kinematics Of The Middle East And Eastern Mediterranean Updated, Rob Westaway
Kinematics Of The Middle East And Eastern Mediterranean Updated, Rob Westaway
Turkish Journal of Earth Sciences
No abstract provided.
Metabasite Blocks From The Koçyaka Hp-Lt Metamorphic Rocks, Konya, Central Anatolia: Geochemical Evidence For An Arc-Back-Arc Pair?, Peter A. Floyd, L. Özgül, M. Cemal Göncüoğlu
Metabasite Blocks From The Koçyaka Hp-Lt Metamorphic Rocks, Konya, Central Anatolia: Geochemical Evidence For An Arc-Back-Arc Pair?, Peter A. Floyd, L. Özgül, M. Cemal Göncüoğlu
Turkish Journal of Earth Sciences
The Kütahya-Bolkardağ Belt, situated on the northern margin of the Tauride-Anatolide Platform, includes slices of HP/LT metamorphic rocks adjacent to allochthonous ophiolitic fragments. The Koçyaka Metamorphic Complex is one such thrust slice and is located to the northeast of Konya. The local tectonostratigraphic succession consists of Upper Cretaceous calcareous metasediments overlain respectively by the Altınekin and Akçasar mélanges of ophiolitic character. Both mélanges contain metabasites (pillow lavas and amphibolites) overprinted with HP-LT glaucophanitic assemblages and later low-grade facies associations. The geodynamic significance of the ophiolites prior to dismemberment (as oceanic crust) is in dispute, being either interpreted as a separate …
Roveacrinids From Northern Arabian Plate In Se Turkey, Anna Farinacci, Riccardo Manni
Roveacrinids From Northern Arabian Plate In Se Turkey, Anna Farinacci, Riccardo Manni
Turkish Journal of Earth Sciences
Crinoid remains from Cenomanian limestones in SE Anatolia have been studied. These crinoids belong to the family Roveacrinidae and are characterised by their lacking a stem and free living above the sea floor. A new species, Roveacrinus derdereensis Manni, n. sp., has been erected.
Traces Of Ancient Earthquakes In Medieval Cities Along The Silk Road, Northern Tien Shan And Dzhungaria, Andrey Korjenkov, Karl Baipakov, Claudia Chang, Yury Peshkov, Tamara Savelieva
Traces Of Ancient Earthquakes In Medieval Cities Along The Silk Road, Northern Tien Shan And Dzhungaria, Andrey Korjenkov, Karl Baipakov, Claudia Chang, Yury Peshkov, Tamara Savelieva
Turkish Journal of Earth Sciences
The evidence for earthquake destruction at medieval cities along the Silk Road from 800 A.D. to 1500 A.D. was examined using techniques of archaeoseismological mapping of architectural components at three currently excavated sites in southern Kazakhstan: Koylyk (Antonovka), Talgar (Talkhir) and Akyrtash, located on the northern branch of the Silk Road, Kazakhstan. This study revealed the following features of seismic activity at all three sites: (a) fractures cutting through a few adjacent bricks; (b) wall-tilts and collapses; (c) horizontal shift of bricks and stones; (d) rotation of stones and bricks. These types of destruction occurred at or very near the …
The Alignment Of Earthquake T-Axes With The Principal Axes Of Geodetic Strain In The Aegean Region, Philip England
The Alignment Of Earthquake T-Axes With The Principal Axes Of Geodetic Strain In The Aegean Region, Philip England
Turkish Journal of Earth Sciences
The relation between the orientations of the T-axes of earthquakes occurring within the continental crust of the Aegean, and the orientations of the principal axes of geodetic strains is examined. It is shown that the T-axes align with the principal horizontal extension axes to a degree that is unlikely to have arisen by chance, and it is concluded that the seismic deformation of the region is consistent with the response of a quasi-continuous medium to a stress regime that is organised on a regional scale.
Extensional Neotectonic Regime Through The Ne Edge Of The Outer Isparta Angle, Sw Turkey: New Field And Seismic Data, Ali̇ Koçyi̇ği̇t, A. Arda Özacar
Extensional Neotectonic Regime Through The Ne Edge Of The Outer Isparta Angle, Sw Turkey: New Field And Seismic Data, Ali̇ Koçyi̇ği̇t, A. Arda Özacar
Turkish Journal of Earth Sciences
The Akşehir-Afyon Graben (AAG) is a 4-20-km-wide, 130-km-long NW-trending depression that separates central Anatolia in the NE and the Isparta Angle (IA) in the SW. Its southwestern margin-bounding fault determines the northeast edge of the outer IA that was previously interpreted as a compressional neotectonic structure, whereas our field evidence and recent seismic data substantiated that it is an oblique-slip normal fault characterising an extensional neotectonic regime. The AAG has an episodic and asymmetrical evolutionary history. This is indicated by two superimposed graben infills and structures. The older infill is folded, thrust-faulted and Early-early Middle Miocene in age. The younger …
Coulomb Stress Interactions And The 1999 Marmara Earthquakes, Zi̇yadi̇n Çakir, A. Aykut Barka, Emre Evren
Coulomb Stress Interactions And The 1999 Marmara Earthquakes, Zi̇yadi̇n Çakir, A. Aykut Barka, Emre Evren
Turkish Journal of Earth Sciences
The effects of previous earthquakes on the 1999 İzmit and Düzce earthquakes, the influence of the İzmit earthquake on the Düzce earthquake, and the seismic hazard in the Marmara region are investigated using Coulomb failure stress. Calculation of the Coulomb stress changes using the fault parameters deduced from the modelling of the coseismic Synthetic Aperture Radar Interferometry (InSAR) and GPS data shows that the İzmit earthquake occurred where the Coulomb stress was increased by the previous events. Despite the stress decrease on the Düzce Fault due to the events before 1999, the Düzce earthquake appears to have been triggered by …
Kinematics Of The November 12, 1999 (Mw=7.2) Düzce Earthquake Deduced From Sar Interferometry, Zi̇yadi̇n Çakir, A. Aykut Barka, Jean Bernard De Chabalier, Rolando Armijo, Bertrand Meyer
Kinematics Of The November 12, 1999 (Mw=7.2) Düzce Earthquake Deduced From Sar Interferometry, Zi̇yadi̇n Çakir, A. Aykut Barka, Jean Bernard De Chabalier, Rolando Armijo, Bertrand Meyer
Turkish Journal of Earth Sciences
On November 12 1999, a destructive earthquake struck the Düzce area, following the 17 August 1999 İzmit earthquake that had occurred to the west about 3 months earlier. The Mw=7.2 Düzce earthquake was somewhat interesting in several ways. The most surprising feature of this earthquake is related to its rupture geometry, which appears to contradict what is commonly observed in strike-slip earthquakes. First, compared to its magnitude, the length of the surface rupture mapped in the field was rather short (~35 km). Second, according to seismic and some geodetic observations, the fault plane dips to the north at a very …
Timing Of Late Holocene Earthquakes On The Eastern Düzce Fault And Implications For Slip Transfer Between The Southern And Northern Strands Of The North Anatolian Fault System, Bolu, Turkey, Christopher Hitchcock, Erhan Altunel, A. Aykut Barka, Jeffrey Bachhuber, William Lettis, John Helms, Scott Lindvall
Timing Of Late Holocene Earthquakes On The Eastern Düzce Fault And Implications For Slip Transfer Between The Southern And Northern Strands Of The North Anatolian Fault System, Bolu, Turkey, Christopher Hitchcock, Erhan Altunel, A. Aykut Barka, Jeffrey Bachhuber, William Lettis, John Helms, Scott Lindvall
Turkish Journal of Earth Sciences
Results of trenching across the eastern Düzce Fault document that surface rupture has occurred repeatedly on the fault prior to the 1999 Düzce earthquake, and that offset during previous earthquakes occurred at the same location and with similar amounts and type of slip as that of the 1999 earthquake. The most recent pre-1999 earthquake on the fault occurred about 300 years ago. At least four and possibly five earthquakes (including 1999) have occurred in the past 2100 years. The earthquake recurrence interval ranges from 300 to 800 years. Estimates of cumulative slip on the northern and southern branches of the …
Earthquake Faulting At Ancient Cnidus, Sw Turkey, Erhan Altunel, Iain S. Stenwart, Luigi Piccardi, A. Aykut Barka
Earthquake Faulting At Ancient Cnidus, Sw Turkey, Erhan Altunel, Iain S. Stenwart, Luigi Piccardi, A. Aykut Barka
Turkish Journal of Earth Sciences
The ruins of Cnidus, an important ancient city in southwestern Asia Minor, lie directly on an earthquake fault - the Cnidus Fault. Offset and deformed archaeological remains along the trace of the fault testify to its recent activation. The ancient city's famous Round Temple of Aphrodite is vertically offset by 0.35 m across the fault. The fault also forms the back wall to the Sanctuary of Demeter where Roman-age walls are displaced and deformed by slip on the fault. Archaeological evidence suggests multiple episodes of abrupt destruction at the site and, in the Sanctuary of Demeter, indicates past earthquake surface …
Earthquakes And Seismic Faulting: Effects On Tunnels, Villy A. Kontogianni, Stathis C. Stiros
Earthquakes And Seismic Faulting: Effects On Tunnels, Villy A. Kontogianni, Stathis C. Stiros
Turkish Journal of Earth Sciences
A study of tunnels in areas affected by strong earthquakes in the last 50-100 years revealed at least three cases of tunnels damaged by earthquake shaking or offset by seismic faulting, including the Bolu (Turkey) twin tunnels, which collapsed during the 1999 Düzce earthquake. These data indicate that tunnels cannot be considered as structures invulnerable to earthquakes. Furthermore, the tectonic offset of tunnels shows that certain observed seismic surface ruptures are not necessarily indicative of tectonic faulting and represent only secondary local ground instability effects.
Geology And Hydrothermal Alteration Of The Aydın-Salavatlı Geothermal Field, Western Anatolia, Turkey, İsmai̇l Hakki Karamanderesi̇, Cahi̇t Helvaci
Geology And Hydrothermal Alteration Of The Aydın-Salavatlı Geothermal Field, Western Anatolia, Turkey, İsmai̇l Hakki Karamanderesi̇, Cahi̇t Helvaci
Turkish Journal of Earth Sciences
The Aydın-Salavatlı geothermal field is located in the middle part of the Büyük Menderes Graben, and is characterized by normal-fault structures. The stratigraphic sequence of the Aydın-Salavatlı geothermal field consists of metamorphic rocks of the Menderes Massif and sedimentary rocks deposited during the rifting period of the Menderes Massif in the Miocene. Geological data suggest that there is a connection between tectonic development and periods of hydrothermal alteration. Hydrothermal alteration in the Aydın-Salavatlı geothermal field occurred in five distinct periods, and all are related to different stages of faulting systems, from the Middle Miocene up to the present. The first …
First Records Of Conodonts From "The Permo-Carboniferous Of Demirözü" (Bayburt), Eastern Pontides, Ne Turkey, Şenol Çapkinoğlu
First Records Of Conodonts From "The Permo-Carboniferous Of Demirözü" (Bayburt), Eastern Pontides, Ne Turkey, Şenol Çapkinoğlu
Turkish Journal of Earth Sciences
Permo-Carboniferous sedimentary rocks, which belong to the pre-Jurassic basement of the Eastern Pontides, occur in the Cebre relative autochthon and the Hamurkesen thrust sheet in the Demirözü area, Bayburt, NE Turkey, and consist of the Çatalçeşme and Hardişi formations, respectively. Some limestone beds of the Çatalçeşme Formation in the village of Çatalçeşme produced the first conodont faunas encountered in Palaeozoic sediments of the Eastern Pontides. A rich conodont fauna with abundant Neognathodus bassleri (HARRIS & HOLLINGSWORTH), less Idiognathodus sp. and Streptognathodus elegantulus STAUFFER & PLUMMER, and rare Gondolella sp. were obtained from a densely-packed bioclastic packstone bed on the west …
Mineralogy And Geochemistry Of Melilite Leucitites, Balçıkhisar, Afyon (Turkey), Cüneyt Akal
Mineralogy And Geochemistry Of Melilite Leucitites, Balçıkhisar, Afyon (Turkey), Cüneyt Akal
Turkish Journal of Earth Sciences
The Middle Miocene Afyon volcanic complex crops out in west-central Anatolia and comprises products of extensive potassic-ultrapotassic volcanic activity that intrude and/or cover the sedimentary formations of the western Taurides. Based on their stratigraphic setting, three stages of potassic and ultrapotassic volcanism are distinguishable. Melilite-leucitite lavas are the products of the first stage and followed by lamproites that represent the second stage of volcanism. The leucitite block- and fragment-rich Balçıkhisar volcaniclastic succession overlies the products of the first and second stage volcanism. Lacustrine sedimentary rocks cover the products of first and second stage volcanism. Lacustrine sedimentary rocks are gradationally overlain …
Monitoring The Kinematics Of Anatolia Using Permanent Gps Network Stations, Onur Lenk, Ali̇ Türkezer, Semi̇h Ergi̇ntav, Ali̇ İhsan Kurt, Alpay Belgen
Monitoring The Kinematics Of Anatolia Using Permanent Gps Network Stations, Onur Lenk, Ali̇ Türkezer, Semi̇h Ergi̇ntav, Ali̇ İhsan Kurt, Alpay Belgen
Turkish Journal of Earth Sciences
The establishment and promotion of three-dimensional geodetic networks supported by continuous Global Positioning System (GPS) data are capable of yielding valuable data in order to enable regional realisation of the International Terrestrial Reference Frame (ITRF) and monitor deformation of the lithosphere. Providing 24-hour continuous data in connection with International GPS Service (IGS) global stations, the Turkish Permanent GPS Network (TPGN) was established in 1999. The main goal of establishing these network stations is to provide adequate information on such an active area, where the collision between African, Arabian and Eurasian plates is occurring. An additional aim is continuous monitoring by …