Open AccessSTUDY ON REACTIVATION POSSIBILITY OF THE FAULTS SYSTEM IN THE WESTERN PART OF THE SOUTH CHINA SEA AS A SOURCE OF GEOLOGICAL HAZARDS
Author(s) -
Tuan Dung Tran,
R Kulinich,
Quang Minh Nguyen,
Văn Sáng Nguyễn,
Tuan Duong Tran,
Trung Thanh Nguyen,
Ba Dai Nguyen,
Trong Lap Tran,
Kim Dung Nguyen,
Xuan Tung Dang,
Dinh Cham Dao,
Thai-Son Nguyen
Publication year - 2021
Publication title -
tihookeanskaâ geologiâ
Language(s) - English
Resource type - Journals
ISSN - 0207-4028
DOI - 10.30911/0207-4028-2021-40-6-68-84
Subject(s) - geology , crust , seismology , landslide , fault (geology) , geologic hazards , stress field , china , active fault , fault block , geophysics , geography , engineering , structural engineering , archaeology , finite element method
The article summarizes the results of research aimed at study the possible reactivation of the fault system in the Earth's crust of the South China Sea with likely dangerous consequences for the coastal area of Vietnam. The research was carried out over several years with the publication of interim results. The solution to this problem required the determination of the regional stress field in the Earth's crust. Analysis of the focal mechanisms of local earthquakes, as well as the structural characteristics of faults, obtained by gravity and seismic data, was used for this. The possibility of renewal of fault activity was determined by the inversed-stress method in the calculated regional stress field. The parameters of the present-day stress field were used to estimate the required slip force along the pre-existing faults. To assess the probability of reactivation of the entire system of faults, the possibility of horizontal and vertical structural (block) displacements in the Earth's crust of the study area was calculated. Based on a comprehensive analysis of the data obtained, a forecast was made of the probability of reactivation of the fault system in the South China Sea region. This can be the cause of earthquakes, underwater landslides and other geological hazards in the coastal area of Vietnam.