Gravity Changes before the Fengnan M4.5 Earthquake in Tangshan, Hebei Province
Abstract Based on the observation data of flowing gravity in the capital area from 2017 to 2019, we analyze the gravity changes at different time scales before the M4.5 earthquake in Tangshan, Hebei province, on December 5, 2019. The results show:1) The image of the variation of the 0.5 a scale gravity field well reflects the evolution process of the earthquake: “in 1 a before the earthquake, the gravity field continued to rise(positive) change-the local reverse(negative) change before the earthquake-the earthquake occurred near the zero contour line of the gravity gradient zone”; 2) The 0.5 a, 1 a and 2 a scale gravity fields before the earthquake, show that the earthquake occurred near the zero contour line of gravity change; 3) The change of gravity observed before the earthquake may be caused by the upwelling process of deep thermal materials.
Key words :
Fengnan 4.5 earthquake
gravity changes
zero contour
Cite this article:
FENG Jianlin,TAN Yujuan,SONG Jinyue et al. Gravity Changes before the Fengnan M4.5 Earthquake in Tangshan, Hebei Province[J]. jgg, 2020, 40(11): 1126-1128.
FENG Jianlin,TAN Yujuan,SONG Jinyue et al. Gravity Changes before the Fengnan M4.5 Earthquake in Tangshan, Hebei Province[J]. jgg, 2020, 40(11): 1126-1128.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2020/V40/I11/1126
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WANG Qinghua, HAO Hongtao,WANG Jian,LIU Shaoming,LI Zhongya,HU Minzhang. Construction and Analysis of Seismic Response Capability of Gravimetric Network in Yunnan [J]. jgg, 2019, 39(3): 317-324.
[11]
LIU Shaoming;HAO Hongtao;HU Minzhang. Gravity Changes before the M4.5 and M4.1 Earthquakes in Zigui County [J]. jgg, 2019, 39(11): 1118-1121.
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WANG Jiapei,SHEN Chongyang,XUAN Songbai,YANG Guangliang,HAO Hongtao. Density Variation in the Crust before the Jiuzhaigou, Sichuan, MS 7.0 Earthquake of 2017 [J]. jgg, 2018, 38(8): 771-776.
[13]
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LI Ji,LIU Zhenghua,TAN Hongbo. Post-Seismic Effect Simulation of the Sumatra MW 8.6 Earthquake [J]. jgg, 2018, 38(5): 459-463.
[15]
. [J]. jgg, 2017, 37(增2): 128-133.