Deformation textures in the principal slip zone of the Chelungpu fault, Taiwan, and its implication for stress change during the seismic cycle

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dc.contributor.authorKuo, LWen_AU
dc.contributor.authorLuzin, Ven_AU
dc.contributor.authorChen, PCen_AU
dc.contributor.authorYeh, ECen_AU
dc.contributor.authorMa, KFen_AU
dc.date.accessioned2023-08-04T01:33:49Zen_AU
dc.date.available2023-08-04T01:33:49Zen_AU
dc.date.issued2018-12-10en_AU
dc.date.statistics2023-02-24en_AU
dc.description.abstractThermal pressurization is postulated for fault lubrication during seismic ruptures and leads catastrophic natural disasters. One recent example includes the active Chelungpu fault resulted in 1999 Mw 7.6 Chi-Chi earthquake in Taiwan. Efforts to improve seismic hazard assessment in such a region require a quantitative understanding of fault dynamics during earthquake generation. The principal slip zone (PSZ) of the active Chelungpu fault, showing rapid shear heating of fault gouge, might preserve stress magnitude accommodated the thermal pressurization during the earthquake. Here we conduct in situ neutron texture analysis for determining both recent and ancient histories of rocks because deformation events like earthquakes are imprinted in the crystallographic grain orientation. Overall, 12 samples collected from the fresh fault core, which represent almost continuous scan across the fault, were analyzed with the neutron experiment on KOWARI, Australia. Two distinguished types of the preferred orientation were found: (1) the textures with c-axis orientations predominantly parallel to bedding planes, which are found in the most of sedimentary rocks, are compaction-related and this is observed for the most analyzed samples; (2) the textures of sample 5 and 10, which are identified as Chi-Chi PSZ, demonstrate quite different deformation history with different orientation of the principal stresses that plausibly resulted from thermal pressurization process within the PSZ. Integrating these observations with the multiple stress inversion method, we obtain the change in stress field and it magnitude related to the end of the fault rupture. Since thermal pressurization process is proposed as a widespread process for earthquake generation and propagation, we suggest that the investigation of gouge orientation of a fault offers the opportunity to study the stress drop and recovery during the seismic cycle.en_AU
dc.identifier.articlenumberT13B-03en_AU
dc.identifier.citationKuo, L.-W., Luzin, V., Chen, P.-C., Yeh, E.-C., & Ma, K.-F. (2018). Deformation textures in the principal slip zone of the Chelungpu fault, Taiwan, and its implication for stress change during the seismic cycle. Paper presented at the AGU Fall Meeting, Washington, D. C., 10 to 14 December 2018. Retrieved from: https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/387795en_AU
dc.identifier.conferenceenddate2018-12-14en_AU
dc.identifier.conferencenameAGU Fall Meetingen_AU
dc.identifier.conferenceplaceWashington, D. C., USAen_AU
dc.identifier.conferencestartdate2018-12-10en_AU
dc.identifier.otherT13B-03en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/387795en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15083en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.relation.urihttps://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/387795en_AU
dc.subjectEarthquakesen_AU
dc.subjectTaiwanen_AU
dc.subjectPressurizationen_AU
dc.subjectStressesen_AU
dc.subjectRocksen_AU
dc.subjectDeformationen_AU
dc.subjectExperiment resultsen_AU
dc.subjectANSTOen_AU
dc.subjectMesauring instrumentsen_AU
dc.subjectSeismic eventsen_AU
dc.titleDeformation textures in the principal slip zone of the Chelungpu fault, Taiwan, and its implication for stress change during the seismic cycleen_AU
dc.typeConference Paperen_AU
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