Microseismic Activity and Spatial Distribution of Coda-Q in the Westernmost Part of the North Anatolian Fault Zone, Turkey

We carried out a short-term observation of microearthquakes in the seismic gap region in the westernmost part of the North Anatolian fault zone. In this region, the North Anatolian fault zone branches into two fault zones: the Izmit-Sapanca fault zone on the north, and the Iznik-Mekece fault on the south. The results of our analyses are as follows: (1) Microseismic activity was much higher along the Izmit-Sapanca fault zone than along the Iznik-Mekece fault. (2) A fault plane solution of strike-slip type was obtained for a microearthquake along the Iznik-Mekece fault. On the other hand, the solutions of both strik-slip and normal-faulting types were determined for microearthquakes along the Izmit-Sapanca fault zone. (3) Relatively lower coda-Q values were estimated around the Izmit-Sapanca and Iznik-Mekece fault zones, compared with the values in the region north of the fault zones. This attenuation property is considered to be closely related to the inhomogeneity of the crust, probably due to the earthquake faulting along the North Anatolian fault zone. Seen from the above result (2), we may estimate the faulting type of the future large earthquake in the seismic gap region as follows: If it occurs along the Iznik-Mekece fault, it will have a strikeslip mechanism; but if it occurs along the Izmit-Sapanca fault zone, its faulting type may have two possibilities, strike-slip or normal-slip

Migration of a Broken Kirschner Wire after Surgical Treatment of Acromioclavicular Joint Dislocation

Kirschner wire (K-wire) is one of the commonly used implants in orthopaedics practice. Migration of the wire is one of the most frequently reported complications after fixation by the K-wire. In particular, it has been reported that a greater range of motion in the shoulder, negative intrathoracic pressure associated with respiration, gravitational force, and muscular activities may cause migration from the upper extremities. In general, thin and long foreign bodies with smooth surfaces that are localized within the tendon sheath and at an upper extremity can migrate more readily and can reach longer distances. Here, we present a patient with long-term migration of a broken K-wire who underwent fixation for acromioclavicular joint dislocation 5 years ago

Total hip arthroplasty in the developmental dysplasia of the hip using transverse subtrochanteric osteotomy

BACKGROUND: We assessed the results of the transverse subtrochanteric femoral shortening osteotomy technique and the cementless THA process applied to Crowe type III and IV patients with developmental dysplasia of the hips. METHODS: We retrospectively evaluated 25 patients (32 hips) between 2006 and 2014. RESULTS: The mean follow-up time was 5.1 years. The mean preoperative Harris hip score was 49.5, which increased to 87.1 postoperatively. The mean preoperative leg-length discrepancy was 3.6 cm; the mean postoperative discrepancy was 0.5 cm. CONCLUSION: THA with subtrochanteric femoral shortening osteotomy technique is an effective technique for treating developmental dysplasia of the hip

Mid-transverse Location in Primary Colon Tumor

BACKGROUND: The location of colonic tumors has been linked to different clinical and oncologic outcomes. Transverse colon cancers are generally included as right colon cancers. Furthermore, hepatic and splenic flexure tumors are usually included as components of the transverse colon

Tsunami early warning in the eastern Mediterranean, Aegean and black sea

A National Tsunami Warning Centre in Turkey (NTWC-TR) established at the Kandilli Observatory and Earthquake Research Institute (KOERI) under the ICG/NEAMTWS (The Intergovernmental Coordination Group for the Tsunami Warning System in the Northeastern Atlantic, the Mediterranean and connected seas region) initiative is operational since January 2012 based on MOD1 Tsunami Scenario Database and TAT (Tsunami Analysis Tool) received from EC-JRC through a collaborative agreement. NTWC-TR is also acknowledged as a Candidate Tsunami Watch Provider within NEAMTWS. The Centre is relying on a system on systems embodying seismic and sea level monitoring, tsunami modeling, message dissemination systems, preparedness and mitigation activities. Considerable improvement on the seismic and sea-level network has been achieved; the communication infrastructure at KOERI has been upgraded and now includes its own GTS system. Further improvement of the Tsunami Warning System at the NTWC-TR will be accomplished through KOERI's cooperation with EC-JRC and METU to improve the scenario database and through participation in the FP-7 Project TRIDEC focusing on new technologies for real-time intelligent earth information management to be used in Tsunami Early Warning Systems. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE)

Shear wave splitting in a young continent-continent collision: An example from eastern Turkey

An edited version of this paper was published by the American Geophysical Union (AGU). Copyright 2003, AGU. See also: http://www.agu.org/pubs/crossref/2003.../2003GL017390.shtml; http://atlas.geo.cornell.edu/turkey/publications/Sandvol-et-al_2003b.htmWe have determined the shear wave splitting fast polarization direction and delay time using data from the ETSE broadband experiment (Eastern Turkey Seismic Experiment), a deployment of 29 broadband seismic stations across the collision zone of the Arabian, Eurasian, and Anatolian plates. Our results show that the fast polarization directions are relatively uniform and they exhibit primarily NE-SW orientations. No abrupt changes in anisotropy directions are observed across the main tectonic units in the region: the Bitlis Suture (BS) and the North and Eastern Anatolian Fault zones. The fast polarization directions are determined to be sub-parallel to the Anatolian, Arabian, and Eurasian absolute plate velocities, except for those stations in the northeastern corner of the Anatolian Plateau. Observed delay times range from 0.7 to 2.0 seconds with an average value of 1.0 second; the largest values are within the northern Anatolian Plateau which is underlain by an exceptionally low velocity zone in the uppermost mantle. We interpret shear wave splitting as the vector difference of the Eurasian lithosphere and northeastern or southwestern directed flow of the asthenospheric mantle. Comparisons of the polarization anisotropy with measurements of Pn azimuthal anisotropy suggest vertical anisotropic layering except in those areas which are underlain by partially molten uppermost mantle