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Offshore Fault Geometrics in the Pearl River Estuary, Southeastern China: Evidence from Seismic Reflection Data
- Source :
- Journal of Ocean University of China. 17:799-810
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- The Pearl River Estuary (PRE) is located at the onshore-offshore transition zone between South China and South China Sea Basin, and it is of great significant value in discussing tectonic relationships between South China block and South China Sea block and seismic activities along the offshore active faults in PRE. However, the researches on geometric characteristics of offshore faults in this area are extremely lacking. To investigate the offshore fault distribution and their geometric features in the PRE in greater detail, we acquired thirteen seismic reflection profiles in 2015. Combining the analysis of the seismic reflection and free-air gravity anomaly data, this paper revealed the location, continuity, and geometry of the littoral fault zone and other offshore faults in PRE. The littoral fault zone is composed of the major Dangan Islands fault and several parallel, high-angle, normal faults, which mainly trend northeast to northeast-to-east and dip to the southeast with large displacements. The fault zone is divided into three different segments by the northwest-trending faults. Moreover, the basement depth around Dangan Islands is very shallow, while it suddenly increases along the islands westward and southward. These has resulted in the islands and neighboring areas becoming the places where the stress accumulates easily. The seismogenic pattern of this area is closely related to the comprehensive effect of intersecting faults together with the low velocity layer.
- Subjects :
- geography
geography.geographical_feature_category
010504 meteorology & atmospheric sciences
Ocean Engineering
Active fault
Fault (geology)
010502 geochemistry & geophysics
Oceanography
01 natural sciences
Gravity anomaly
Basement
Tectonics
Transition zone
Littoral zone
Submarine pipeline
Seismology
Geology
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 19935021 and 16725182
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- Journal of Ocean University of China
- Accession number :
- edsair.doi...........0e9a8da89f8a6c54418dcf4b4aac6740