WANG ZhenYu,
SHE YaWen,
FU GuangYu et al
.2018.Density structures of crust and vertical tectonic stress field of lithosphere in Northeast Asia Chinese Journal of Geophysics(in Chinese),61(6): 2280-2291,doi: 10.6038/cjg2018L0209
Density structures of crust and vertical tectonic stress field of lithosphere in Northeast Asia
WANG ZhenYu1, SHE YaWen2,3, FU GuangYu1, PI YuYang4
1. Key Laboratory of Earthquake Prediction, Institute of Earthquake Forecasting, Chinese Earthquake Administration, Beijing 100036, China; 2. Hebei Earthquake Agency, Shijiazhuang 050021, China; 3. Institute of Geophysics, Chinese Earthquake Administration, Beijing 100081, China; 4. Institute of Seismology, Chinese Earthquake Administration, Wuhan 430071, China
Abstract:Considering the lateral density variation of crust, we investigate the isostatic state of Northeast Asia with the utilization of EIGEN-6C4 gravity data and ETOPO1 topography data, and analyze the uplifting mechanism of the Changbai Mountain. First, we study in detail two profiles in roughly east-west direction which stretch over Changbai Mountain and Sakhalin Island (profile A & B). Specifically, taking CRUST1.0 model as initial conditions, we inverse the density structure of Crust along the two profiles with Bouguer gravity anomalies, using Airy and Airy-Pratt isostasy theories, respectively. The results show that, to some degree, there is lateral inhomogeneity in the crust density structure along the profiles. Then, according to the inversed density structures and topography data we calculate the depth of isostasy along each profile. Based on the comparison of the depth of isostasy with the one of Moho, we calculate the vertical tectonic stress of the two profiles. And then, with the method illustrated above, we calculate the vertical tectonic stress along 21 profiles in exactly east-west direction within our study area, with sampling interval of 1 degree. By interpolating the above results we obtain the distribution of the vertical tectonic stress of the whole Northeast Asia. In total, the crust of Northeast Asia, whose vertical tectonic stress is about 0, is in isostatic state. Among which, the vertical tectonic stress at the Changbai Mountain is -(15~25) MPa, at Japan Islands is -(40~50)MPa, and at the Pacific trench is 15~25 MPa. Finally, we estimate the effective elastic thickness (Te) and the load ratio of the area around the Changbai Mountain, using the method of Free-air gravity anomaly admittance. The result shows that the Te of the Changbai Mountain is about 10 km, which mean that the lithosphere of the area is relatively soft. The initial load is mainly from the Moho, about 78% of total load, which suggest that the uplifting of the Changbai Mountain was mainly resulted from the uplifting of material of the Mantle.
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