Spatial and temporal variations in slip behavior beneath Alaska-Aleutian subduction zone
Dissertation (Ph.D.) University of Alaska Fairbanks, 2018 Characterizing spatial and temporal variations of slip behavior observed along subduction faults is of great significance for understanding the dynamics of subduction zones, features of great subduction zone earthquakes and deformation patter...
Main Author: | |
---|---|
Other Authors: | , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | http://hdl.handle.net/11122/9689 |
id |
ftunivalaska:oai:scholarworks.alaska.edu:11122/9689 |
---|---|
record_format |
openpolar |
spelling |
ftunivalaska:oai:scholarworks.alaska.edu:11122/9689 2023-05-15T18:48:36+02:00 Spatial and temporal variations in slip behavior beneath Alaska-Aleutian subduction zone Li, Shanshan Freymueller, Jeffrey T. Christensen, Douglas Tape, Carl West, Michael 2018-08 http://hdl.handle.net/11122/9689 en_US eng http://hdl.handle.net/11122/9689 Geosciences Subduction zones Alaska Aleutian Islands Faults Dissertation phd 2018 ftunivalaska 2023-02-23T21:37:20Z Dissertation (Ph.D.) University of Alaska Fairbanks, 2018 Characterizing spatial and temporal variations of slip behavior observed along subduction faults is of great significance for understanding the dynamics of subduction zones, features of great subduction zone earthquakes and deformation patterns across the subduction plate boundary through the seismic cycle. The Alaska-Aleutian subduction zone is one of the most tectonically active margins in the world. Great earthquakes and slow slip events recorded in this area are closely related in space. An increasingly dense array of Global Positioning System (GPS) receivers measures surface deformation at sites with high accuracy and provides a perfect tool for estimating the slip distribution on the plate boundary. GPS observations show that the motion of the Earth is not entirely linear: the long-term steady motion is interrupted by events like earthquakes, slow slip events (SSEs) and deformation of volcanoes, etc. Two long-term SSEs were detected in Lower Cook Inlet, Alaska (1992.0-2004.8 and 2009.85-2011.81) by inverting the slip distributions from GPS site velocities. The occurrence of SSEs based on the estimated slip distribution patterns provides strong evidence for the transition from stick-slip behavior to episodes and continuous aseismic creep on the subduction plate interface. Coulomb stressing rate changes (CSRC) due to the two detected long-term SSEs indicate that regions in the shallow slab (30-60 km) that experience significant increase in CSRC show an increase in seismicity rate during SSE periods. The modified quantitative rate/state stress transfer model suggests that the SSEs increase stress on surrounding faults, thereby increasing the seismicity rate even though the ratio of the SSE induced stressing rate to the background stressing rate is small. The SSEs were shown to cause significant stress changes in the seismogenic zone. This highlights the importance of exploring the relationship between SSEs and earthquakes, as well as how this ... Doctoral or Postdoctoral Thesis Alaska Aleutian Islands University of Alaska: ScholarWorks@UA Fairbanks |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Subduction zones Alaska Aleutian Islands Faults |
spellingShingle |
Subduction zones Alaska Aleutian Islands Faults Li, Shanshan Spatial and temporal variations in slip behavior beneath Alaska-Aleutian subduction zone |
topic_facet |
Subduction zones Alaska Aleutian Islands Faults |
description |
Dissertation (Ph.D.) University of Alaska Fairbanks, 2018 Characterizing spatial and temporal variations of slip behavior observed along subduction faults is of great significance for understanding the dynamics of subduction zones, features of great subduction zone earthquakes and deformation patterns across the subduction plate boundary through the seismic cycle. The Alaska-Aleutian subduction zone is one of the most tectonically active margins in the world. Great earthquakes and slow slip events recorded in this area are closely related in space. An increasingly dense array of Global Positioning System (GPS) receivers measures surface deformation at sites with high accuracy and provides a perfect tool for estimating the slip distribution on the plate boundary. GPS observations show that the motion of the Earth is not entirely linear: the long-term steady motion is interrupted by events like earthquakes, slow slip events (SSEs) and deformation of volcanoes, etc. Two long-term SSEs were detected in Lower Cook Inlet, Alaska (1992.0-2004.8 and 2009.85-2011.81) by inverting the slip distributions from GPS site velocities. The occurrence of SSEs based on the estimated slip distribution patterns provides strong evidence for the transition from stick-slip behavior to episodes and continuous aseismic creep on the subduction plate interface. Coulomb stressing rate changes (CSRC) due to the two detected long-term SSEs indicate that regions in the shallow slab (30-60 km) that experience significant increase in CSRC show an increase in seismicity rate during SSE periods. The modified quantitative rate/state stress transfer model suggests that the SSEs increase stress on surrounding faults, thereby increasing the seismicity rate even though the ratio of the SSE induced stressing rate to the background stressing rate is small. The SSEs were shown to cause significant stress changes in the seismogenic zone. This highlights the importance of exploring the relationship between SSEs and earthquakes, as well as how this ... |
author2 |
Freymueller, Jeffrey T. Christensen, Douglas Tape, Carl West, Michael |
format |
Doctoral or Postdoctoral Thesis |
author |
Li, Shanshan |
author_facet |
Li, Shanshan |
author_sort |
Li, Shanshan |
title |
Spatial and temporal variations in slip behavior beneath Alaska-Aleutian subduction zone |
title_short |
Spatial and temporal variations in slip behavior beneath Alaska-Aleutian subduction zone |
title_full |
Spatial and temporal variations in slip behavior beneath Alaska-Aleutian subduction zone |
title_fullStr |
Spatial and temporal variations in slip behavior beneath Alaska-Aleutian subduction zone |
title_full_unstemmed |
Spatial and temporal variations in slip behavior beneath Alaska-Aleutian subduction zone |
title_sort |
spatial and temporal variations in slip behavior beneath alaska-aleutian subduction zone |
publishDate |
2018 |
url |
http://hdl.handle.net/11122/9689 |
geographic |
Fairbanks |
geographic_facet |
Fairbanks |
genre |
Alaska Aleutian Islands |
genre_facet |
Alaska Aleutian Islands |
op_relation |
http://hdl.handle.net/11122/9689 Geosciences |
_version_ |
1766241752919834624 |