Characteristics of Gravity Field Change Before and After Laizhou MS 4.6 Earthquake in 2013 and Rushan MS 4.6 Earthquake in 2015
LU Hanpeng
LI Jiankui
WANG Fengji
ZHANG Gang
Abstract：Using the flow gravity observation data in Shandong survey area from 2009 to 2015,the absolute gravity control,relative gravity conjunction of the classical adjustment method,the paper gives the dynamic image of gravity field in Shandong survey area and systematically analyzes the spatial variation of gravitational field and segment difference change characteristics before and after the Laizhou MS 4.6 earthquake on 23rd November 2013,Rushan MS 4.6 earthquake on 22nd May,2015.Combining with the geological structure and earthquake mechanism characteristics analysis,the paper discusses the relation of characteristic of gravity variation and Laizhou earthquake and Rushan earthquake.The results show that Rushan the zone of Laizhou MS 4.6 earthquake is located at the gravity field variation difference zero line turn areas;the zone of Rushan MS 4.6 earthquake is located at the area with the maximum positive anomaly of gravity field difference.In addition,it can be seen from the cross fault segment difference that the earthquake seismic and gravity difference on both sides the fracture zone inevitably have a significant cumulative rise process with large magnitude and earthquakes generally occur in the transition falls.
Keywords：Laizhou earthquakeRushan earthquakeGravitational field variationGeological structure
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 27-33 )