Relationship among Steepest Gradient of Gravity Field,Active Fault Zone and Large Earthquake,and Its Rheological Model
ZhouZhipeng
DuQiujiao
LiangQing
WangJie
ZengZuoxun
WangXiong
Abstract：In order to find the relationship among a large (Ms ≥7)earthquake,or a giant earthquake (Ms ≥8)and the steepest gradient of gravity field and active fault,the free air gravity anomaly map by EIGEN-6C gravity model was calculated,the bouguer gravity anomaly and active fault of the region trends to occur large or giant earthquake is consulted.The spatial distribution of large and giant earthquakes and active fault,gravity anomaly is analyzed.We come to a conclusion that a large or giant earthquake trends to occur at the intersection area of steepest gradient of gravity field and active fault.With the previous study of deep structures in those area,we propose a rheological model to interpret the regularity.It is that the flow of the rheological layer (body)blocked by the brittle rocks cause the gravity anomaly and energy accumulation and release.
Keywords：large earthquakesteepest gradient of gravity fieldactive fault zonedeep structurerheology
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 1887-1895 )