CHARACTERISTIC ANALYSIS OF DYNAMIC GRAVITY CHANGEBEFORE YUTIAN Ms7.3 EARTHQUAKE, 2008
Shen Chongyang 1,2) ;Li Hui1,2) ;Sun Shaoan1,2) ;Yang Guanliang1,2) ;1,2) ;Tan Hongbo1,2) ;and Liu Shaoming1,2)
1) Institute of Seismology, CEA, Wuhan 4300712) Crustal Movement Laboratory, Wuhan 430071
Abstract On the basis of the data and results of the repeated gravity observation network in Chinese mainland since 1998, the evolution characteristics of dynamic gravity field changes in the seismogenic region before Yutian Ms7.3 earthquake in Mar, 2008 has been analyzed and summarized. The dynamic evolution images of regional gravity field reflects the middlelong term (two to ten years) essential information during the earthquake preparation. The notable gravity symbols of the earthquake preparation are positive gravity change (rise) lasted for many years and relatively largescale gradient zone of gravity change that the former is in favor of continuous accumulation of seismic energy and the latter makes for occurrence of seismic rupture. The related gravity change during the process of the earthquake preparation have the characteristics: increaseaccelerated increasedecelerated increas which is similar to that of Tangshan Ms7.8 earthquake in 1976. The maximum accumulative gravity change related to the earthquake can reach 200×10-8 ms -2 .
Key words ：
Yutian Ms7.3 earthquake
gravimetry
gravity field
dynamic change
seismogeny
Received: 01 January 1900
Corresponding Authors:
Shen Chongyang
Cite this article:
Shen Chongyang,Li Hui,Sun Shaoan et al. CHARACTERISTIC ANALYSIS OF DYNAMIC GRAVITY CHANGEBEFORE YUTIAN Ms7.3 EARTHQUAKE, 2008[J]. , 2010, 30(4): 1-7.
Shen Chongyang,Li Hui,Sun Shaoan et al. CHARACTERISTIC ANALYSIS OF DYNAMIC GRAVITY CHANGEBEFORE YUTIAN Ms7.3 EARTHQUAKE, 2008[J]. jgg, 2010, 30(4): 1-7.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2010/V30/I4/1
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