Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau
Various earthquake fault types, mechanism solutions and stress fields, as well as GPS and geothermal data are analyzed for the study of the crustal movements on the Tibetan plateau and their tectonic implications. The results show that a lot of the normal faulting type-event concentrated at altitude...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2009-01-01
|
| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2009/897424 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832558980263575552 |
|---|---|
| author | Jiren Xu Zhixin Zhao |
| author_facet | Jiren Xu Zhixin Zhao |
| author_sort | Jiren Xu |
| collection | DOAJ |
| description | Various earthquake fault types, mechanism solutions and stress fields, as well as GPS and geothermal data are analyzed for the study of the crustal movements on the Tibetan plateau and their tectonic implications. The results show that a lot of the normal faulting type-event concentrated at altitudes greater than 4000 m on the central Tibetan plateau. The altitudes concentrating normal faulting type-events can be zoned two parts: the western part, the Lhasa block, and the eastern part, the Qiangtang-Changdu region. The azimuths of T-axes are in a general E-W direction in the Lhasa block and NW-SE or NNW-SSE in the Qiangtang-Changdu region at the altitudes of the Tibetan plateau. The tensional stresses in E-W direction and NW-SE direction predominate normal faulting earthquake occurrence in the Lhasa block and the Qiangtang-Changdu region, respectively. The slipping displacements of the normal-faulting-type events have great components in near E-W direction and NW-SE direction in the Lhasa block and the Qiangtang-Changdu region, respectively. The extensions are probably an eastward or southeastward extensional motion, being mainly tectonic activity phenomena in the plateau altitudes. The extensional motions due to normal-fault earthquakes are important tectonic activity regimes on the high altitudes of the plateau. The easterly crustal extensions on the plateau are attributable to the gravitational collapse of the high plateau and eastward extrusion of hotter mantle materials beneath the eastern boundary of the plateau. Numbers of thrust-fault and strike-slip-fault earthquakes with strong compressive stress in a general NNE-SSW direction occur on the edges of the plateau. |
| format | Article |
| id | doaj-art-0a05de3cfdb34e66a67003e4c2d25776 |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2009-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-0a05de3cfdb34e66a67003e4c2d257762025-02-03T01:31:09ZengWileyInternational Journal of Geophysics1687-885X1687-88682009-01-01200910.1155/2009/897424897424Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan PlateauJiren Xu0Zhixin Zhao1Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, ChinaInstitute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, ChinaVarious earthquake fault types, mechanism solutions and stress fields, as well as GPS and geothermal data are analyzed for the study of the crustal movements on the Tibetan plateau and their tectonic implications. The results show that a lot of the normal faulting type-event concentrated at altitudes greater than 4000 m on the central Tibetan plateau. The altitudes concentrating normal faulting type-events can be zoned two parts: the western part, the Lhasa block, and the eastern part, the Qiangtang-Changdu region. The azimuths of T-axes are in a general E-W direction in the Lhasa block and NW-SE or NNW-SSE in the Qiangtang-Changdu region at the altitudes of the Tibetan plateau. The tensional stresses in E-W direction and NW-SE direction predominate normal faulting earthquake occurrence in the Lhasa block and the Qiangtang-Changdu region, respectively. The slipping displacements of the normal-faulting-type events have great components in near E-W direction and NW-SE direction in the Lhasa block and the Qiangtang-Changdu region, respectively. The extensions are probably an eastward or southeastward extensional motion, being mainly tectonic activity phenomena in the plateau altitudes. The extensional motions due to normal-fault earthquakes are important tectonic activity regimes on the high altitudes of the plateau. The easterly crustal extensions on the plateau are attributable to the gravitational collapse of the high plateau and eastward extrusion of hotter mantle materials beneath the eastern boundary of the plateau. Numbers of thrust-fault and strike-slip-fault earthquakes with strong compressive stress in a general NNE-SSW direction occur on the edges of the plateau.http://dx.doi.org/10.1155/2009/897424 |
| spellingShingle | Jiren Xu Zhixin Zhao Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau International Journal of Geophysics |
| title | Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau |
| title_full | Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau |
| title_fullStr | Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau |
| title_full_unstemmed | Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau |
| title_short | Extensional Seismogenic Stress and Tectonic Movement on the Central Region of the Tibetan Plateau |
| title_sort | extensional seismogenic stress and tectonic movement on the central region of the tibetan plateau |
| url | http://dx.doi.org/10.1155/2009/897424 |
| work_keys_str_mv | AT jirenxu extensionalseismogenicstressandtectonicmovementonthecentralregionofthetibetanplateau AT zhixinzhao extensionalseismogenicstressandtectonicmovementonthecentralregionofthetibetanplateau |