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  • 1
    Publication Date: 2023-06-20
    Description: An experimental multi-parameter structural monitoring system has been installed on the Kurpsai dam, western Kyrgyz Republic. This system consists of equipment for seismic and strain measurements for making longer- (days, weeks, months) and shorter- (minutes, hours) term observations, dealing with, for example seasonal (longer) effects or the response of the dam to ground motion from noise or seismic events. Fibre-optic strain sensors allow the seasonal and daily opening and closing of the spaces between the dam’s segments to be tracked. For the seismic data, both amplitude (in terms of using differences in amplitudes in the Fourier spectra for mapping the modes of vibration of the dam) and their time–frequency distribution for a set of small to moderate seismic events are investigated and the corresponding phase variabilities (in terms of lagged coherency) are evaluated. Even for moderate levels of seismic-induced ground motion, some influence on the structural response can be detected, which then sees the dam quickly return to its original state. A seasonal component was identified in the strain measurements, while levels of noise arising from the operation of the dam's generators and associated water flow have been provisionally identified.
    Description: Bundesministerium für Forschung und Technologie http://dx.doi.org/10.13039/501100004937
    Description: Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ (4217)
    Keywords: ddc:551.22 ; Structural health monitoring ; Dam engineering ; Operational and environmental effects ; Strong-motion ; Strain ; Elastic response ; Kurpsai dam
    Language: English
    Type: doc-type:article
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  • 2
    Publication Date: 2023-05-12
    Keywords: AASI; Area/locality; Calculated from GPS; Disko Island, West Greenland; Event label; ILUL; KAGA; Latitude of event; Longitude of event; Number; QEQE; Standard deviation; Uplift rate; Uplift rate, standard deviation; West Greenland
    Type: Dataset
    Format: text/tab-separated-values, 35 data points
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  • 3
    Publication Date: 2023-05-12
    Keywords: AASI; Amplitude; Angle; Area/locality; Calculated from GPS; Disko Island, West Greenland; Event label; ILUL; KAGA; Latitude of event; Longitude of event; QEQE; Standard deviation; Uplift rate; Uplift rate, standard deviation; West Greenland
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
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  • 4
    Publication Date: 2023-05-12
    Keywords: AASI; Area/locality; Calculated from GPS; Disko Island, West Greenland; Event label; ILUL; KAGA; Latitude of event; Longitude of event; QEQE; Uplift rate; Uplift rate, standard deviation; West Greenland
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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  • 5
    Publication Date: 2023-05-12
    Keywords: AASI; Area/locality; Calculated from GPS; Disko Island, West Greenland; Event label; ILUL; KAGA; Latitude of event; Longitude of event; QEQE; Uplift rate; Uplift rate, standard deviation; West Greenland
    Type: Dataset
    Format: text/tab-separated-values, 55 data points
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  • 6
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    In:  Supplement to: Khan, Shfaqat Abbas; Liu, Lin; Wahr, John; Howat, Ian M; Joughin, Ian; van Dam, Tonie; Fleming, Kevin (2010): GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss. Journal of Geophysical Research, 115(B9), B09405, https://doi.org/10.1029/2010JB007490
    Publication Date: 2023-12-13
    Description: We analyze 2006-2009 data from four continuous Global Positioning System (GPS) receivers located between 5 and 150 km from the glacier Jakobshavn Isbrae, West Greenland. The GPS stations were established on bedrock to determine the vertical crustal motion due to the unloading of ice from Jakobshavn Isbrae. All stations experienced uplift, but the uplift rate at Kangia North, only 5 km from the glacier front, was about 10 mm/yr larger than the rate at Ilulissat, located only ~45 km further away. This suggests that most of the uplift is due to the unloading of the Earth's surface as Jakobshavn thins and loses mass. Our estimate of Jakobshavn's contribution to uplift rates at Kangia North and Ilulissat are 14.6 ± 1.7 mm/yr and 4.9 ± 1.1 mm/yr, respectively. The observed rates are consistent with a glacier thinning model based on repeat altimeter surveys from NASA's Airborne Topographic Mapper (ATM), which shows that Jakobshavn lost mass at an average rate of 22 ± 2 km**3/yr between 2006 and 2009. At Kangia North and Ilulissat, the predicted uplift rates computed using thinning estimates from the ATM laser altimetry are 12.1 ± 0.9 mm/yr and 3.2 ± 0.3 mm/yr, respectively. The observed rates are slightly larger than the predicted rates. The fact that the GPS uplift rates are much larger closer to Jakobshavn than further away, and are consistent with rates inferred using the ATM-based glacier thinning model, shows that GPS measurements of crustal motion are a potentially useful method for assessing ice-mass change models.
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 7
    ISSN: 1573-2568
    Keywords: aspirin ; dyspepsia ; epidemiology ; gastroesophageal reflux ; nonsteroidal antiinflammatory drugs ; prevalence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Upper gastrointestinal tract symptoms are common in the elderly and, despite a paucity of data, nonsteroidal antiinflammatory drugs (NSAIDs) are believed to be important risk factors. We aimed to evaluate the association of NSAIDs with dyspepsia and heartburn in a population-based study. An age- and gender-stratified random sample of Olmsted County, Minnesota, Caucasian residents aged 65 years and older was mailed a valid self-report questionnaire; 74% responded (N=1375). Age- and gender-adjusted (to 1980 US Caucasian population) prevalence rates for NSAID use, dyspepsia (defined as pain located in the upper abdomen or nausea), and heartburn (defined as retrosternal burning pain) were calculated. Logistic regression analysis was used to estimate the association of dyspepsia and heartburn with potential risk factors adjusting for age and gender. The age- and gender-adjusted annual prevalences (per 100) of aspirin and nonaspirin NSAID use were 60.0 (95% CI 57.2,62.7) and 26.1 (95% CI 23.6,28.7), respectively. The annual prevalences of dyspepsia and heartburn were 15.0 (95% CI 12.9,17.0) and 12.9 (95% CI 10.9,14.8), respectively. Aspirin was associated with dyspepsia and/or heartburn (OR=1.6, 95% CI 1.2,2.2) as were nonaspirin NSAIDs (OR=1.8, 95% CI 1.3,2.6), but smoking and alcohol were not significant risk factors. Aspirin and nonaspirin NSAIDs are associated with almost a twofold risk of upper gastrointestinal tract symptoms in elderly community subjects.
    Type of Medium: Electronic Resource
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  • 8
    Publication Date: 2021-05-06
    Description: The effective management of the risks posed by natural and man-made hazards requires all relevant threats and their interactions to be considered. This paper proposes a three-level framework for multi-risk assessment that accounts for possible hazard and risk interactions. The first level is a flow chart that guides the user in deciding whether a multi-hazard and risk approach is required. The second level is a semi-quantitative approach to explore if a more detailed, quantitative assessment is needed. The third level is a detailed quantitative multi-risk analysis based on Bayesian networks. Examples that demonstrate the application of the method are presented.
    Description: Published
    Description: 59–74
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: N/A or not JCR
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
    Publication Date: 2021-03-29
    Description: Present-day sea-level change around Greenland is examined by assessing the roleplayed by glacial-isostatic adjustment (GIA). We consider the contributions from: (1) the ongoing GIA due to changes in the extent and thickness of the Greenland Ice Sheet (GIS) following the Last Glacial Maximum (LGM), (2) the equivalent signal associated with the continental ice masses located outside of Greenland, and (3) present-day changes in the GIS. Changes in the GIS arising from the last glacial-interglacial transition generally result in falling sea level today. The contribution from ice-load changes outside of Greenland causes rising sea level, owing to Greenland's location on the collapsing forebulge that surrounds the former North American ice sheets. Combining predictions of these contributions gives results showing rising sea level in the southwest and falling sea level in the north and east. However, this is strongly dependent upon the neoglacial part of the GIS's history. The present-day behaviour of the GIS is predicted to cause falling sea level with rates of several mm yr?1 around areas experiencing the larger ice-load changes. The available tide-gauge data are considered unusable by the standards of many workers. Nevertheless, we compare rates of local sea-level change inferred from this type of data with our predictions. In Southern Greenland, where the tide-gauge stations are located, sea level is predicted to be rising at a rate of 4 to 5 mm yr?1. Our predictions match most of the rates obtained from the tide-gauge time series, with the exception of Qaqortoq where the inferred rates may also reect additional oceanic and meteorological effects. Similarly, our predictions are consistent with GPS observations, with again the exception of Qaqortoq.
    Description: report
    Keywords: 551 ; TOG 000 ; VSY 000 ; Isostasie {Geophysik} ; Polargebiete {Fossile Energieträger}
    Language: English
    Type: article , publishedVersion
    Format: application/pdf
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  • 10
    Publication Date: 2022-06-20
    Description: Accurate quantification of the millennial-scale mass balance of the Greenland ice sheet (GrIS) and its contribution to global sea-level rise remain challenging because of sparse in situ observations in key regions. Glacial isostatic adjustment (GIA) is the ongoing response of the solid Earth to ice and ocean load changes occurring since the Last Glacial Maximum (LGM; ~21 thousand years ago) and may be used to constrain the GrIS deglaciation history. We use data from the Greenland Global Positioning System network to directly measure GIA and estimate basin-wide mass changes since the LGM. Unpredicted, large GIA uplift rates of +12 mm/year are found in southeast Greenland. These rates are due to low upper mantle viscosity in the region, from when Greenland passed over the Iceland hot spot about 40 million years ago. This region of concentrated soft rheology has a profound influence on reconstructing the deglaciation history of Greenland. We reevaluate the evolution of the GrIS since LGM and obtain a loss of 1.5-m sea-level equivalent from the northwest and southeast. These same sectors are dominating modern mass loss. We suggest that the present destabilization of these marine-based sectors may increase sea level for centuries to come. Our new deglaciation history and GIA uplift estimates suggest that studies that use the Gravity Recovery and Climate Experiment satellite mission to infer present-day changes in the GrIS may have erroneously corrected for GIA and underestimated the mass loss by about 20 gigatons/year.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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