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Izmit (Kocaeli) Turkey Earthquake, August 17 1999, Set 2, Structural Damage

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        individualName:  Heather McCullough
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    metadataStandardName:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
    metadataStandardVersion:  ISO 19115-2:2009(E)
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        citation:  (CI_Citation)
            title:  Izmit (Kocaeli) Turkey Earthquake, August 17 1999, Set 2, Structural Damage
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                date:  2000-08-01
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        abstract:  On August 17, 1999, at 3:01 A.M. local time (00:01:39.8 UTC) a magnitude (Mw) 7.4 earthquake occurred along the westernmost North Anatolian fault. The earthquake epicenter was 11 km (7 mi) southeast of the City of Izmit, in the sub-province of Kocaeli, a densely populated area in the industrial heartland of Turkey, and less than 80 km southeast of Istanbul.The Anatolian fault, a right lateral strike-slip fault, has a history of earthquakes. (A right-lateral, strike-slip fault is one in which the motion of the opposite side of the fault, as one looks across the fault, is to the right.) In the last sixty years, there have been eleven earthquakes with magnitudes (Ms) larger than 6.7 along this fault. The August 1999 quake was located in a seismic gap between areas of the fault that had broken in 1967 and in 1963. The maximum displacement along the fault was more than five meters. The total rupture length was nearly 170 km. Accelerograms showed that the earthquake consisted of two major events located about 30 km apart.The earthquake damaged buildings across seven provinces for a distance of 250 km from Istanbul to Bolu. As many as seventy percent of the buildings in portions of the cities of Adapazari, Golcuk, Izmit, Topcular, and Kular were severely damaged or collapsed. Nearly all the fatalities and injuries can be attributed to building collapse. An estimated 60,000-115,000 buildings were damaged or destroyed. Damage - estimates range from $10 billion to $40 billion. The fault crossed some of the most densely populated regions of Turkey. The affected population numbered 15 million people. Casualties totaled 17,000 and additional thousands were missing and presumed dead. Injuries numbered 24,000 and 500,000 people were left homeless with 200,000 living on the streets. The economics of the damaged region presented ten percent of the Gross National Product of Turkey.Structural damage occurred in several ways. Many structures were deformed or destroyed by the lateral and vertical offsets of the fault itself. Several apartment buildings were torn apart by the fault rupture and collapsed. There was great variation of response even among similarly constructed buildings in the same neighborhood, with some collapsing and others having moderate or little apparent damage. Residential buildings were usually three to seven stories in height. The predominant structural type in Turkey consists of reinforced concrete frames with unreinforced masonry infill (brick walls filling the gaps between concrete frames). These infill walls tended to fall out with the earthquake shaking, adding stress to the beams and columns.Failures occurred in foundations, and in soft stories. These are stories that have few supporting walls and are often found in the first story of a structure. They may be open stories in order to accommodate shops or a garage, and may have few walls supporting the second story floor. Failures also occurred in weak columns paired with strong beams, and in columns with lack of detailing and column confinement. Buildings having four or more stories were much more likely to be damaged or to collapse since the buildings with greater height incurred a greater amount of displacement at the top relative to the bottom of the buildings. In some areas, buildings were subjected to damaging ground settlement, liquefaction, or subsidence and inundation from lake waters. Hundreds of buildings in the city of Adapazari settled, tipped, or toppled as liquefaction weakened lakebed sediments. In the severe liquefaction areas, more than sixty percent of multi-story buildings suffered partial or total collapse due to structural failure. With the exception of the most heavily damaged areas, the water system was functional in six days or less. There was no significant damage reported to dams or reservoirs. Wastewater pipelines were heavily damaged. Electric power was disrupted when buildings collapsed onto electrical lines, electrical poles tilted or collapsed, and transformers tilted due to support failure. However, the electric power service was nearly restored in two weeks. Some highway bridges were damaged when fault rupture occurred beneath them. Only a few residential fires were reported, since most building materials were fire-resistant, and there are no natural gas pipelines in the region. Following the earthquake, fire broke out at the large Tupas Oil Refinery in Korfez. One fire at the refinery resulted when a collapsed 90-meter reinforced concrete stack knocked down equipment and pipeways. An oil spill from the refinery contaminated the waters of Izmit Bay. Loss of electrical power, debris on the roads, and lack of water hampered firefighting efforts. A number of damaging quakes have occurred in this area in the past. In 1754, the area near Izmit experienced an earthquake that resulted in 2,000 deaths. In 1967, a 7.1 magnitude earthquake occurred near Izmit. In 1970, an earthquake near Gediz, 160 km (100 mi) to the south, killed 1,000 people. This area of Turkey will continue to experience seismic activity. Appropriate steps need to be taken now to minimize the effects and fatalities of the next earthquake.
        purpose:  To provide long-term scientific data stewardship for the Nation's geophysical data, ensuring quality, integrity, and accessibility.
        credit:  Patricia Lockridge
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            fileName: http://www.ngdc.noaa.gov/hazard/icons/small_res/46/46_925.jpg
            fileDescription:  The whole building collapsed due to soil failure (liquefaction) and a first story collapse. The collapse totally blocked the road. The brick structure remained intact with no observable cracking. Note that surrounding buildings appear undamaged.
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            keyword:  Earth Science > Solid Earth > Seismology > Earthquake Occurrences
            keyword:  Earth Science > Solid Earth > Tectonics > Faults
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            keyword:  Asia > Turkey > Marmara > Kocaeli > Izmit
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            otherConstraints:  Access Constraints: None Use Constraints: None Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
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        language:  eng; USA
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                    timePosition:  1999-08-17
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                orderingInstructions:  Non-Digital Form: 35mm slides: Izmit (Kocaeli) Turkey Earthquake, August 17, 1999: Structural Damage Ordering Instructions: Product may be ordered from the online store via: http://ols.nndc.noaa.gov/plolstore/plsql/olstore.prodspecific?prodnum=G01958-SLI-A0001 Custom Order Process: Contact Data Center
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                orderingInstructions:  Ordering Instructions: Product may be downloaded via: http://www.ngdc.noaa.gov/nndc/struts/results?eq_1=46&t=101634&s=0&d=4&d=44 Custom Order Process: Contact Data Center
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        maintenanceNote:  This metadata was automatically generated from the Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata standard version FGDC-STD-012-2002 using the June 2011 version of the FGDC RSE to ISO 19115-2 transform. The Spatial Reference Information is not currently mapped over to ISO but will be mapped in future versions.
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            individualName:  Heather McCullough
            organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
            contactInfo:  (CI_Contact)
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                    voice:  (303) 497-3707
                    facsimile:  (303) 497-6513
                address:  (CI_Address)
                    deliveryPoint:  NOAA/NESDIS/NGDC E/GC3 325 Broadway
                    city:  Boulder
                    administrativeArea:  CO
                    postalCode:  80305-3328
                    country:  USA
                    electronicMailAddress:  Heather.McCullough@noaa.gov
                hoursOfService:  7:30 - 5:00 Mountain
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