Sökning: "earthquakes"

Visar resultat 21 - 25 av 56 avhandlingar innehållade ordet earthquakes.

1. 21. Analysis of underground concrete pipelines subjected to seismic high-frequency loads

   Författare :Roghayeh Abbasiverki; Anders Ansell; Jan Laue; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Earthquake; High-frequency; Underground; Pipelines; Reinforced concrete; Inclined bedrock; Jordbävning; Högfrekvent; Underjordisk; Rörledningar pipelines ; Armerad betong; Lutande berggrund; Civil and Architectural Engineering; Byggvetenskap;

   Sammanfattning : Buried pipelines are tubular structures that are used for transportation of important liquid materials and gas in order to provide safety for human life. During an earthquake, imposed loads from soil deformations on concrete pipelines may cause severe damages, possibly causing disturbance in vital systems, such as cooling of nuclear power facilities. LÄS MER

3. 22. Analysis of regional seismic data by means of higher-order spectra

   Författare :Leif Persson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; Earth sciences; Geovetenskap; Geofysik med inriktning mot seismologi; Geophysics with specialization in Seismology;

   Sammanfattning : The use of higher-order statistical and spectral estimators as complementary analysis for conventional regional seismic data processing is studied. The issues addressed are; the properties of the complex bispectrum of regional seismic phases, the experimental detection performance of higher-order statistical detectors, discrimination between local earthquakes and explosions, statistical tests and bicoherence, biphase and spatial bispectrum analysis of regional P-, S, and Lg-phases. LÄS MER

4. 23. Numerics of Elastic and Acoustic Wave Motion

   Författare :Kristoffer Virta; Gunilla Kreiss; Anders Petersson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; finite differences; stability; high order accuracy; elastic wave equation; acoustic wave equation; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

   Sammanfattning : The elastic wave equation describes the propagation of elastic disturbances produced by seismic events in the Earth or vibrations in plates and beams. The acoustic wave equation governs the propagation of sound. LÄS MER

5. 24. Simulating Earthquake Rupture and Near-Fault Fracture Response

   Författare :Billy Fälth; Björn Lund; Roland Roberts; Harald Hökmark; Eric Dunham; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geofysik med inriktning mot seismologi; Geophysics with specialization in Seismology;

   Sammanfattning : Sweden is presently a low seismicity area where most earthquakes are small and pose no serious threat to constructions. For the long-term perspectives of safety assessments of geological repositories for spent nuclear fuel, however, the effects of large earthquakes have to be considered. LÄS MER

7. 25. Centralized Disaster Management Collaboration in Turkey

   Författare :Helena Hermansson; Daniel Nohrstedt; Charles Parker; Annica Sandström; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; collaboration; disaster management; collaborative disaster management; cross-sector collaboration; trust; power balance; legitimacy; integration; local knowledge; local actors; civil society; interdependence; pre-existing relations; political affiliation; natural disaster; disaster response; damage assessment; aid distribution; search and rescue; decentralization; central-local collaboration; political-administrative system; Turkey; Van; Erciş; Statskunskap; Political Science; Statsvetenskap med inriktning mot krishantering och internationell samverkan;

   Sammanfattning : Following unprecedented earthquakes in 1999, highly centralized Turkey initiated reforms that aimed to improve disaster management collaboration and to empower local authorities. In 2011, two earthquakes hit the country anew affecting the city of Van and town of Erciş in Turkey’s southeast. LÄS MER