A new method for computing the vertical tectonic stress of the crust by use of hybrid gravity and GPS data

作者：Gao Shang-Hua; She Ya-Wen; Fu Guang-Yu^*

来源：Acta Geophysica Sinica, 2016, 59(6): 2006-2013.

DOI：10.6038/cjg20160607

• Gravity
• Bouguer gravity anomaly
• Tectonic stress
• Isostasy
• The Moho

This paper presents a new method to calculate the vertical tectonic stress of the crust by use of hybrid gravity and GPS observation data. The calculation procedures are as follows: (1) Compute the Bouguer gravity anomalies using gravity and GPS data; (2) Deduce the Moho depths using the obtained Bouguer gravity anomaly data; (3) Compute the isostatic crustal thickness based on isostatic theory and GPS data; (4) Calculate the vertical tectonic stress of the crust based on the buoyancy that the remaining materials between the Moho and the isostatic crustal thickness bears. Using the above method, we calculate the vertical tectonic stress at the east boundary of Bayanhar block and surrounding area. The vertical tectonic stress is about zero at the area east to the Longquanshan fault zone, positive at the area between the Longmenshan and Longquanshan fault zones, and negative at the eastern part of Bayanhar block. The vertical tectonic stress at the southeast segment of the Xianshuihe fault and adjacent area is as high as -(40 similar to 50) MPa, with rapid gradient changes. The vertical tectonic stress at Songpan Plateau is -(10 similar to 20) MPa,lower than that of Xianshuihe area.

• 出版日期2016-6
• 单位中国地震局地震预测研究所