Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake
The strength of the lithosphere controls tectonic evolution and seismic cycles, but how rocks deform under stress in their natural settings is usually unclear. We constrain the rheological properties beneath the Taiwan orogenic belt using the stress perturbation following the 1999 Chi-Chi earthquake...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/83261 http://hdl.handle.net/10220/47999 |
| _version_ | 1811695221505785856 |
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| author | Tang, Chi-Hsien Hsu, Ya-Ju Barbot, Sylvain Moore, James D. P. Chang, Wu-Lung |
| author2 | Earth Observatory of Singapore |
| author_facet | Earth Observatory of Singapore Tang, Chi-Hsien Hsu, Ya-Ju Barbot, Sylvain Moore, James D. P. Chang, Wu-Lung |
| author_sort | Tang, Chi-Hsien |
| collection | NTU |
| description | The strength of the lithosphere controls tectonic evolution and seismic cycles, but how rocks deform under stress in their natural settings is usually unclear. We constrain the rheological properties beneath the Taiwan orogenic belt using the stress perturbation following the 1999 Chi-Chi earthquake and fourteen-year postseismic geodetic observations. The evolution of stress and strain rate in the lower crust is best explained by a power-law Burgers rheology with rapid increases in effective viscosities from ~1017 to ~1019 Pa s within a year. The short-term modulation of the lower-crustal strength during the seismic cycle may alter the energy budget of mountain building. Incorporating the laboratory data and associated uncertainties, inferred thermal gradients suggest an eastward increase from 19.5±2.5°C/km in the Coastal Plain to 32±3°C/km in the Central Range.
Geodetic observations may bridge the gap between laboratory and lithospheric scales to investigate crustal rheology and tectonic evolution. |
| first_indexed | 2024-10-01T07:20:01Z |
| format | Journal Article |
| id | ntu-10356/83261 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:20:01Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/832612020-09-26T21:35:18Z Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake Tang, Chi-Hsien Hsu, Ya-Ju Barbot, Sylvain Moore, James D. P. Chang, Wu-Lung Earth Observatory of Singapore Lower-crustal Rheology Thermal Gradient DRNTU::Science::Geology::Volcanoes and earthquakes The strength of the lithosphere controls tectonic evolution and seismic cycles, but how rocks deform under stress in their natural settings is usually unclear. We constrain the rheological properties beneath the Taiwan orogenic belt using the stress perturbation following the 1999 Chi-Chi earthquake and fourteen-year postseismic geodetic observations. The evolution of stress and strain rate in the lower crust is best explained by a power-law Burgers rheology with rapid increases in effective viscosities from ~1017 to ~1019 Pa s within a year. The short-term modulation of the lower-crustal strength during the seismic cycle may alter the energy budget of mountain building. Incorporating the laboratory data and associated uncertainties, inferred thermal gradients suggest an eastward increase from 19.5±2.5°C/km in the Coastal Plain to 32±3°C/km in the Central Range. Geodetic observations may bridge the gap between laboratory and lithospheric scales to investigate crustal rheology and tectonic evolution. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2019-04-08T08:38:05Z 2019-12-06T15:18:39Z 2019-04-08T08:38:05Z 2019-12-06T15:18:39Z 2019 Journal Article Tang, C.-H., Hsu, Y.-J., Barbot, S., Moore, J. D. P., & Chang, W.-L. (2019). Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake. Science Advances, 5(2), eaav3287-3298. doi:10.1126/sciadv.aav3287 https://hdl.handle.net/10356/83261 http://hdl.handle.net/10220/47999 10.1126/sciadv.aav3287 en Science Advances © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). 13 p. application/pdf |
| spellingShingle | Lower-crustal Rheology Thermal Gradient DRNTU::Science::Geology::Volcanoes and earthquakes Tang, Chi-Hsien Hsu, Ya-Ju Barbot, Sylvain Moore, James D. P. Chang, Wu-Lung Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake |
| title | Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake |
| title_full | Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake |
| title_fullStr | Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake |
| title_full_unstemmed | Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake |
| title_short | Lower-crustal rheology and thermal gradient in the Taiwan orogenic belt illuminated by the 1999 Chi-Chi earthquake |
| title_sort | lower crustal rheology and thermal gradient in the taiwan orogenic belt illuminated by the 1999 chi chi earthquake |
| topic | Lower-crustal Rheology Thermal Gradient DRNTU::Science::Geology::Volcanoes and earthquakes |
| url | https://hdl.handle.net/10356/83261 http://hdl.handle.net/10220/47999 |
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