A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines
Tectonic deformation can result in hazards like tsunamis and earthquakes, which have serious consequences on human livelihoods. A better understanding of tectonic structures can improve tectonic hazard identification in a region, reducing the impact of such hazards. There are gaps in the understandi...
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| Format: | Final Year Project (FYP) |
| Language: | English |
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Nanyang Technological University
2022
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| Online Access: | https://hdl.handle.net/10356/156724 |
| _version_ | 1826110267884306432 |
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| author | Pang, Ivan Yi Han |
| author2 | Aron Meltzner |
| author_facet | Aron Meltzner Pang, Ivan Yi Han |
| author_sort | Pang, Ivan Yi Han |
| collection | NTU |
| description | Tectonic deformation can result in hazards like tsunamis and earthquakes, which have serious consequences on human livelihoods. A better understanding of tectonic structures can improve tectonic hazard identification in a region, reducing the impact of such hazards. There are gaps in the understanding of tectonic structures in the Ilocos region of the Philippines. The region is characterized by complex fault systems including the Manila Trench subduction zone, giving rise to deformation along the coast. Attempts have been made to understand the tectonics in the region by reconstructing the relative sea-level (RSL), but the tectonics in the region are still poorly understood. The reconstruction recorded a RSL fall of ~0.85 m at two sites in the Ilocos region at ~7480 cal yr BP, indicating coseismic uplift. An elastic dislocation model was used to recreate the uplift and identify the faults that caused the event. The model processed hypothetical fault scenarios, producing the predicted surface deformation. Each fault scenario was evaluated by a likelihood function to deduce its likelihood of producing the observed uplift. The function identified the fault scenarios most likely to cause the observed uplift at the two sites. The results suggest that the uplift was caused by a shallow dipping offshore thrust fault located along the accretionary wedge of the Manila Trench. These findings indicate that tectonic deformation in the Ilocos region can be caused by unmapped offshore faults. Thus, future efforts must be made to map the offshore faults to understand the tectonics of the region. |
| first_indexed | 2024-10-01T02:31:36Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/156724 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:31:36Z |
| publishDate | 2022 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1567242023-02-28T16:46:32Z A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines Pang, Ivan Yi Han Aron Meltzner Asian School of the Environment meltzner@ntu.edu.sg Science::Geology::Structural geology Tectonic deformation can result in hazards like tsunamis and earthquakes, which have serious consequences on human livelihoods. A better understanding of tectonic structures can improve tectonic hazard identification in a region, reducing the impact of such hazards. There are gaps in the understanding of tectonic structures in the Ilocos region of the Philippines. The region is characterized by complex fault systems including the Manila Trench subduction zone, giving rise to deformation along the coast. Attempts have been made to understand the tectonics in the region by reconstructing the relative sea-level (RSL), but the tectonics in the region are still poorly understood. The reconstruction recorded a RSL fall of ~0.85 m at two sites in the Ilocos region at ~7480 cal yr BP, indicating coseismic uplift. An elastic dislocation model was used to recreate the uplift and identify the faults that caused the event. The model processed hypothetical fault scenarios, producing the predicted surface deformation. Each fault scenario was evaluated by a likelihood function to deduce its likelihood of producing the observed uplift. The function identified the fault scenarios most likely to cause the observed uplift at the two sites. The results suggest that the uplift was caused by a shallow dipping offshore thrust fault located along the accretionary wedge of the Manila Trench. These findings indicate that tectonic deformation in the Ilocos region can be caused by unmapped offshore faults. Thus, future efforts must be made to map the offshore faults to understand the tectonics of the region. Bachelor of Science in Environmental Earth Systems Science 2022-04-23T06:13:29Z 2022-04-23T06:13:29Z 2022 Final Year Project (FYP) Pang, I. Y. H. (2022). A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/156724 https://hdl.handle.net/10356/156724 en application/pdf Nanyang Technological University |
| spellingShingle | Science::Geology::Structural geology Pang, Ivan Yi Han A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines |
| title | A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines |
| title_full | A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines |
| title_fullStr | A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines |
| title_full_unstemmed | A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines |
| title_short | A likelihood analysis of causative faulting of the 7 ka coastal uplift in Ilocos Region, Philippines |
| title_sort | likelihood analysis of causative faulting of the 7 ka coastal uplift in ilocos region philippines |
| topic | Science::Geology::Structural geology |
| url | https://hdl.handle.net/10356/156724 |
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