FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4225504330> ?p ?o ?g. }

• W4225504330 abstract "<p>Seismic velocity changes before and after large magnitude earthquakes carry information about damage present within the faults in the surrounding region. In this thesis, temporal velocity changes are measured before and after the 2016 Kaikōura earthquake using ambient noise interferometry between 2012 - 2018. This period contains the Mw 7.8 2016 Kaikoura earthquake as well as the 2013 Cook Strait earthquake sequence and a few deep large magnitude earthquakes in 2015 - 2016. Three primary objectives are identified: (1) investigate seismic velocity changes in the Kaikōura region and their connection to the 2016 Kaikōura earthquake to try and determine if there was a change before/after the earthquake, (2) determine how this change varied across the region, and (3) consider if ambient noise can lead to improved detection and understanding of geological hazard. The primary approach used to measure velocity changes in the Kaikōura region involved cross correlating noise recorded by seismic stations across the region. Velocity changes are sought by averaging the best result from multiple onshore station pairs. A secondary approach was also used, in which specific station pairs were averaged to determine if there were more localised velocity changes over more specific regions. This was to determine if the velocity changes observed following the 2016 Kaikōura earthquake occurred over the entire ruptured region. Following the 2016 Kaikōura earthquake a velocity decrease of 0.24±0.02% was observed on the average of the vertical-vertical components for eight stations. The remaining eight cross-component pairs showed a smaller seismic decrease with an average value of 0.22±0.05%. After the decrease following the Kaikōura earthquake, there is a steady velocity increase of 0.13±0.02% over a one-and-a-half-year period. This indicates that prior to the earthquake, seismic velocity was at a steady state until it was perturbed by the Kaikōura earthquake, and seismic velocities rapidly decreased over all stations. Across the region, stations with a longer interstation distance and further away from ruptured faults had a smaller decrease in velocity than station pairs with a smaller interstation distance that were closer to ruptured faults. We interpret the velocity decrease following the Kaikōura earthquake as a result of cracks opening during the earthquake. The velocity increase following the earthquake is indicative of the cracks slowly healing. The Cook Strait earthquake sequence that occurred in 2013 did not cause any velocity changes at the stations used in this thesis. This has been interpreted to be because the changes were too small compared to the background noise or the stations were not recording during the time of the earthquake sequence. Two other decreases were also observed in the region following two deep earthquakes in April 2015 (Mw 6.2, depth = 52km) and February 2016 (Mw 5.7, depth = 48km). Both of these events resulted in a small seismic decrease of 0.1±0.02%. Although these earthquakes were close to seismic stations when they occurred, they were much deeper and had a smaller magnitude than the Kaikōura earthquake so did not cause a large velocity decrease. By understanding what causes velocity changes it is possible to have an improved understanding of the geological hazard in the region.</p>" @default.
• W4225504330 created "2022-05-05" @default.
• W4225504330 creator A5043335131 @default.
• W4225504330 date "2021-12-08" @default.
• W4225504330 modified "2023-10-16" @default.
• W4225504330 title "Effect of the Kaikōura Earthquake on Velocity Changes In and Around the Ruptured Region: A Noise Cross-Correlation Approach" @default.
• W4225504330 doi "https://doi.org/10.26686/wgtn.17145794.v1" @default.
• W4225504330 hasPublicationYear "2021" @default.
• W4225504330 type Work @default.
• W4225504330 citedByCount "0" @default.
• W4225504330 crossrefType "dissertation" @default.
• W4225504330 hasAuthorship W4225504330A5043335131 @default.
• W4225504330 hasBestOaLocation W42255043301 @default.
• W4225504330 hasConcept C105795698 @default.
• W4225504330 hasConcept C109417826 @default.
• W4225504330 hasConcept C114793014 @default.
• W4225504330 hasConcept C115961682 @default.
• W4225504330 hasConcept C121332964 @default.
• W4225504330 hasConcept C126691448 @default.
• W4225504330 hasConcept C127313418 @default.
• W4225504330 hasConcept C1276947 @default.
• W4225504330 hasConcept C13280743 @default.
• W4225504330 hasConcept C154945302 @default.
• W4225504330 hasConcept C163018871 @default.
• W4225504330 hasConcept C165205528 @default.
• W4225504330 hasConcept C166689943 @default.
• W4225504330 hasConcept C203718221 @default.
• W4225504330 hasConcept C205312793 @default.
• W4225504330 hasConcept C2524010 @default.
• W4225504330 hasConcept C2992890811 @default.
• W4225504330 hasConcept C2993808335 @default.
• W4225504330 hasConcept C30947920 @default.
• W4225504330 hasConcept C33923547 @default.
• W4225504330 hasConcept C41008148 @default.
• W4225504330 hasConcept C69361100 @default.
• W4225504330 hasConcept C99498987 @default.
• W4225504330 hasConcept C99844830 @default.
• W4225504330 hasConceptScore W4225504330C105795698 @default.
• W4225504330 hasConceptScore W4225504330C109417826 @default.
• W4225504330 hasConceptScore W4225504330C114793014 @default.
• W4225504330 hasConceptScore W4225504330C115961682 @default.
• W4225504330 hasConceptScore W4225504330C121332964 @default.
• W4225504330 hasConceptScore W4225504330C126691448 @default.
• W4225504330 hasConceptScore W4225504330C127313418 @default.
• W4225504330 hasConceptScore W4225504330C1276947 @default.
• W4225504330 hasConceptScore W4225504330C13280743 @default.
• W4225504330 hasConceptScore W4225504330C154945302 @default.
• W4225504330 hasConceptScore W4225504330C163018871 @default.
• W4225504330 hasConceptScore W4225504330C165205528 @default.
• W4225504330 hasConceptScore W4225504330C166689943 @default.
• W4225504330 hasConceptScore W4225504330C203718221 @default.
• W4225504330 hasConceptScore W4225504330C205312793 @default.
• W4225504330 hasConceptScore W4225504330C2524010 @default.
• W4225504330 hasConceptScore W4225504330C2992890811 @default.
• W4225504330 hasConceptScore W4225504330C2993808335 @default.
• W4225504330 hasConceptScore W4225504330C30947920 @default.
• W4225504330 hasConceptScore W4225504330C33923547 @default.
• W4225504330 hasConceptScore W4225504330C41008148 @default.
• W4225504330 hasConceptScore W4225504330C69361100 @default.
• W4225504330 hasConceptScore W4225504330C99498987 @default.
• W4225504330 hasConceptScore W4225504330C99844830 @default.
• W4225504330 hasLocation W42255043301 @default.
• W4225504330 hasLocation W42255043302 @default.
• W4225504330 hasLocation W42255043303 @default.
• W4225504330 hasOpenAccess W4225504330 @default.
• W4225504330 hasPrimaryLocation W42255043301 @default.
• W4225504330 hasRelatedWork W2130116703 @default.
• W4225504330 hasRelatedWork W2134599014 @default.
• W4225504330 hasRelatedWork W2505355416 @default.
• W4225504330 hasRelatedWork W2809535684 @default.
• W4225504330 hasRelatedWork W3089673821 @default.
• W4225504330 hasRelatedWork W3161342712 @default.
• W4225504330 hasRelatedWork W3162672368 @default.
• W4225504330 hasRelatedWork W4283165407 @default.
• W4225504330 hasRelatedWork W4322099616 @default.
• W4225504330 hasRelatedWork W4384341583 @default.
• W4225504330 isParatext "false" @default.
• W4225504330 isRetracted "false" @default.
• W4225504330 workType "dissertation" @default.