Gravity evolution and earthquake activities of the northeastern edge of Qinghai-Xizang block |
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Authors: | Zhu Yi-qing Li Hui Zhu Gui-zhi and Xu Yun-ma |
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Institution: | (1) Second Crust Monitoring and Application Center, China Earthquake Administration, 710054 Xi’an, China;(2) Institute of Seismology, China Earthquake Administration, 430071 Wuhan, China |
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Abstract: | The relationship between temporal-spatial evolution of gravity and earthquake activity during 1992–2001 has been analyzed
systematically by integrally adjusting the gravity observation data of the northeastern edge of Qinghai-Xizang (Qingzang)
block. The result shows that the gravity observation data of the northeastern edge of Qingzang block obtained by using the
uniform starting datum can completely reflect the precursory gravity information appearing during the seismogenic process.
In the genesis stage of an earthquake, regional gravity anomaly appears in a large area, resulting in related local gravity
anomaly. The dynamic image of gravity field can clearly reflect the orderly evolution and earthquake activity.
Foundation item: Key Project of China Earthquake Administration during the tenth Five-year Plan (100501-05-05). |
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Keywords: | northeastern edge of Qinghai-Xizang block gravity evolution tectonic activity seismogenic characteristics |
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