Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault
Strike-slip earthquakes near major subduction zones have received less attention than thrust or reverse earthquakes in subduction zone areas. The occurrence of the 2018 Palu Mw 7.5 earthquake in eastern Indonesia provides an unprecedented opportunity to investigate the characteristics of one of thes...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/163739 |
| _version_ | 1826111535255126016 |
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| author | Li, Chuanyou Liu, Jinrui Ma, Jun Su, Gang Lan, Jian Li, Xinnan Ren, Zhikun Ran, Hongliu |
| author2 | Earth Observatory of Singapore |
| author_facet | Earth Observatory of Singapore Li, Chuanyou Liu, Jinrui Ma, Jun Su, Gang Lan, Jian Li, Xinnan Ren, Zhikun Ran, Hongliu |
| author_sort | Li, Chuanyou |
| collection | NTU |
| description | Strike-slip earthquakes near major subduction zones have received less attention than thrust or reverse earthquakes in subduction zone areas. The occurrence of the 2018 Palu Mw 7.5 earthquake in eastern Indonesia provides an unprecedented opportunity to investigate the characteristics of one of these events. The Palu earthquake occurred on the left-lateral, north-south-striking Palu-Koro fault, which is the main plate boundary structure accommodating the convergence between blocks in a triple junction area. It excited a significant tsunami, which unusually is associated with strike-slip earthquakes, and also ruptured at a supershear speed, which is mostly observed on strike-slip faults in continents. Based on our fieldwork, we speculate that the normal slip component of the offshore rupture section in Palu bay on the middle segment probably favours tsunami genesis. Our field investigation has revealed evidence of a simple geometry as well as slip partitioning of dip-slip and strike-slip motion on two subparallel strands on the main segment, both of which may have contributed to the supershear of the rupture propagation. Instead of only a transtensive behaviour of the middle segment, our results also illustrate the transpressional property of the northern and southern rupture segments, which shows more complex behaviour than that of a common continental strike-slip fault. |
| first_indexed | 2024-10-01T02:52:19Z |
| format | Journal Article |
| id | ntu-10356/163739 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:52:19Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1637392022-12-15T07:00:00Z Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault Li, Chuanyou Liu, Jinrui Ma, Jun Su, Gang Lan, Jian Li, Xinnan Ren, Zhikun Ran, Hongliu Earth Observatory of Singapore Science::Geology Strike-Slip Earthquake Subduction Zone Strike-slip earthquakes near major subduction zones have received less attention than thrust or reverse earthquakes in subduction zone areas. The occurrence of the 2018 Palu Mw 7.5 earthquake in eastern Indonesia provides an unprecedented opportunity to investigate the characteristics of one of these events. The Palu earthquake occurred on the left-lateral, north-south-striking Palu-Koro fault, which is the main plate boundary structure accommodating the convergence between blocks in a triple junction area. It excited a significant tsunami, which unusually is associated with strike-slip earthquakes, and also ruptured at a supershear speed, which is mostly observed on strike-slip faults in continents. Based on our fieldwork, we speculate that the normal slip component of the offshore rupture section in Palu bay on the middle segment probably favours tsunami genesis. Our field investigation has revealed evidence of a simple geometry as well as slip partitioning of dip-slip and strike-slip motion on two subparallel strands on the main segment, both of which may have contributed to the supershear of the rupture propagation. Instead of only a transtensive behaviour of the middle segment, our results also illustrate the transpressional property of the northern and southern rupture segments, which shows more complex behaviour than that of a common continental strike-slip fault. This study was funded by the National Nonprofit Fundamental Research Grant of China, IGCEA (IGCEA1901), the National Research and Development Program of China (2017YFC1500101) and the National Natural Science Foundation of China (42072250). 2022-12-15T07:00:00Z 2022-12-15T07:00:00Z 2022 Journal Article Li, C., Liu, J., Ma, J., Su, G., Lan, J., Li, X., Ren, Z. & Ran, H. (2022). Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault. Geological Magazine, 159(6), 893-903. https://dx.doi.org/10.1017/S0016756822000012 0016-7568 https://hdl.handle.net/10356/163739 10.1017/S0016756822000012 2-s2.0-85124823777 6 159 893 903 en Geological Magazine © 2022 The Author(s). Published by Cambridge University Press. All rights reserved. |
| spellingShingle | Science::Geology Strike-Slip Earthquake Subduction Zone Li, Chuanyou Liu, Jinrui Ma, Jun Su, Gang Lan, Jian Li, Xinnan Ren, Zhikun Ran, Hongliu Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault |
| title | Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault |
| title_full | Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault |
| title_fullStr | Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault |
| title_full_unstemmed | Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault |
| title_short | Field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike-slip fault |
| title_sort | field observations of surface ruptures accompanying a tsunami and supershear earthquake along a plate boundary strike slip fault |
| topic | Science::Geology Strike-Slip Earthquake Subduction Zone |
| url | https://hdl.handle.net/10356/163739 |
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