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ASLAN, ŞAHİN

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    Publication
    Active subaquatic fault segments in lake İznik along the middle strand of the north anatolian fault, nw Turkey
    (Amer Geophysical Union, 2021-01-01) Gastineau, R.; de Sigoyer, J.; Sabatier, P.; Fabbri, S. C.; Anselmetti, F. S.; Develle, A. L.; Gunduz, S.; Niessen, F.; Gebhardt, A. C.; Şahin, Mustafa; ASLAN, ŞAHİN; Fen Edebiyat Fakültesi; Arkeoloji Ana Bilim Dalı; 0000-0001-5153-1918; E-1041-2019
    The seismic activity of the middle strand of the North Anatolian Fault (MNAF), Northwestern Turkey, is debated because of its quiescence during the instrumental period, in contrast to a significant historical activity documented by several chronicles over the last two millennia. Here, we focus on Lake Iznik, bordered by the MNAF, to get a new insight into its long-term seismicity and its tectonic setting. The study of lacustrine sediment cores reveals 14 earthquake-induced turbidites since their ages correspond to seismic events during the past two millennia. Bathymetry and high-resolution seismic reflection data allow to describe two hitherto unknown subaquatic active fault structures (the South Boyalica and Iznik faults) that belong to the MNAF system. Sediment cores sampled on both sides of the Iznik Fault document an event deposit and a sedimentary unit vertically offset of similar to 40 cm interpreted as the last rupture during the 1065 CE destructive earthquake. Older events are supposed on this fault more than thousand years ago. Further studies will help to estimate the horizontal co-seismic offset of this oblique-slip fault and the calendar of older ruptures. The current seismic gap of thousand years on this segment greatly increases the seismic hazard in this region and must be considered in the seismic risk assessment of the NAF system.Plain Language Summary During large earthquakes, sediments are generally transported from lake slopes to the lake basin. The resulting event deposits can provide information on the recurrence of past regional earthquakes, which is crucial for seismic hazard assessment. In this study, we discovered two underwater fault structures in Lake Iznik, using geophysical methods. Studying the sedimentation on both sides of the southernmost fault, we observed an increased sedimentation rate on the hanging wall of the fault immediately after an event deposit, dated to 1077 +/- 77 cal. CE. We interpreted these indicators as resulting from a co-seismic displacement along the fault plane, linked to the 1065 CE historical earthquake, which had significantly impacted the city of Iznik. We also show that most of the other event deposits in the sediment cores are confidently associated to 14 historical earthquakes since 2,000 years.
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    Publication
    Rhinocerebral mucormycosis case in the emergency room
    (Acil Tıp Hekimleri Derneği Türkiye, 2021-12-01) Aslan, Şahin; Omar, Issa; Durak, Vahide Aslıhan; Cıkrıklar, Halil İbrahim; Özdemir, Fatma; ASLAN, ŞAHİN; OMAR, ISSA MALONGO; DURAK, VAHİDE ASLIHAN; ÇIKRIKLAR, HALİL İBRAHİM; ÖZDEMİR, FATMA; Tıp Fakültesi; Acil Tıp Ana Bilim Dalı; 0000-0003-0836-7862; 0000-0002-6665-7166; EMD-3139-2022; GXT-8042-2022; AAE-9483-2021; AAH-8714-2021; JRF-5591-2023
    Introduction: Rhinocerebral mucormycosis is a rare disease, which causes serious and life-threatening fungal infections.The disease usually develops in immunocompromised individuals and usually begins by mimicking cellulite, especially in the face area, and shows a very rapid course.Case Report: A 75-year-old male patient previously admitted to an external center with 3-4 days complaints of headache, numbness in the right half of his face and closure of his left eye was brought to our emergency department for further investigation.The cranial magnetic resonance imaging (MRI) revealed suspected opportunistic fungal infection or malignancy in the ethmoidal and sphenoidal sinuses.The patient was hospitalized with the diagnosis of opportunistic fungal infection after consultations to relevant clinics. Biopsy revealed polypes and mucocele like cystic tissues. The patient, followed-up and treated with rhinocerebral mucormicosis, was transferred to intensive care unit after deterioration of his general condition.After approximately 45 days of follow-up and treatment, the patient was lost due to multiple organ failure.Conclusion: Rhinocerebral mucormycosis is an emergency that requires a multidisciplinary approach. Presence of one or more of the non-traumatic orbital apex syndrome findings should alert emergency physicians. In this and similar infections with high mortality rates, early diagnosis and treatment may lead to good results.
  • Thumbnail Image
    Publication
    Rhinocerebral mucormycosis case in the emergency room
    (Acil Tıp Hekimleri, 2021-12-01) Aslan, Şahin; Omar, Issa; Durak, Vahide Aslıhan; Çıkrıklar, Halil Ibrahim; Özdemir, Fatma; ASLAN, ŞAHİN; OMAR, ISSA MALONGO; DURAK, VAHİDE ASLIHAN; ÇIKRIKLAR, HALİL İBRAHİM; ÖZDEMİR, FATMA; Tıp Fakültesi; Acil Tıp Bölümü; 0000-0003-0836-7862; EMD-3139-2022; JRF-5591-2023
    Introduction: Rhinocerebral mucormycosis is a rare disease, which causes serious and life-threatening fungal infections.The disease usually develops in immunocompromised individuals and usually begins by mimicking cellulite, especially in the face area, and shows a very rapid course.Case Report: A 75-year-old male patient previously admitted to an external center with 3-4 days complaints of headache, numbness in the right half of his face and closure of his left eye was brought to our emergency department for further investigation.The cranial magnetic resonance imaging (MRI) revealed suspected opportunistic fungal infection or malignancy in the ethmoidal and sphenoidal sinuses.The patient was hospitalized with the diagnosis of opportunistic fungal infection after consultations to relevant clinics. Biopsy revealed polypes and mucocele like cystic tissues. The patient, followed-up and treated with rhinocerebral mucormicosis, was transferred to intensive care unit after deterioration of his general condition.After approximately 45 days of follow-up and treatment, the patient was lost due to multiple organ failure.Conclusion: Rhinocerebral mucormycosis is an emergency that requires a multidisciplinary approach. Presence of one or more of the non-traumatic orbital apex syndrome findings should alert emergency physicians. In this and similar infections with high mortality rates, early diagnosis and treatment may lead to good results.