Characterization of Aftershock Sequences from Large Strike-Slip Earthquakes Along Geometrically Complex Faults

Simple item page
dc.contributor.advisorThomas, Amanda
dc.contributor.authorSexton, Emily
dc.date.accessioned2018-09-06T21:59:58Z
dc.date.available2018-09-06T21:59:58Z
dc.date.issued2018-09-06
dc.description.abstractLarge earthquakes often exhibit complex slip distributions and occur along non-planar faults, resulting in variable stress changes throughout the fault region. To better discern the role of stress changes and fluid flow on aftershock sequences, we examine areas of enhanced and reduced mean stress along the structurally complex strike-slip faults that hosted the 1992 Landers, 2010 El-Mayor Cucapah, and 2016 Kumamoto earthquakes. We characterize the behavior of aftershock sequences with the Epidemic Type Aftershock-Sequence Model and use the Maximum Log Likelihood method to determine the optimal set of ETAS parameter values along each fault. This study indicates that extensional areas experience greater secondary aftershock triggering and a higher density of aftershocks directly following the mainshock, which could be attributed to fluid influx. However, our results also highlight some shortcomings of the ETAS model, including high parameter correlation, and influence of catalog size and magnitude cutoff on parameter estimations.en_US
dc.identifier.urihttps://hdl.handle.net/1794/23786
dc.language.isoen_US
dc.publisherUniversity of Oregon
dc.rightsAll Rights Reserved.
dc.subjectAftershocksen_US
dc.subjectETASen_US
dc.subjectStress Changeen_US
dc.subjectStrike-Slipen_US
dc.titleCharacterization of Aftershock Sequences from Large Strike-Slip Earthquakes Along Geometrically Complex Faults
dc.typeElectronic Thesis or Dissertation
thesis.degree.disciplineDepartment of Geological Sciences
thesis.degree.grantorUniversity of Oregon
thesis.degree.levelmasters
thesis.degree.nameM.S.

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Sexton_oregon_0171N_12215.pdf
Size:
267.09 MB
Format:
Adobe Portable Document Format
Download

Collections

Theses and Dissertations
Geological Sciences Theses and Dissertations