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OALib Journal期刊
ISSN: 2333-9721
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A study on the occurrence background and process of Wenchuan MS8.0 earthquake
汶川MS8.0级地震发生背景与过程的研究

Analysis of the Crust Deformations before and after the 2008 Wenchuan Ms8.0 Earthquake Based on GPS Measurements

ANALYSIS OF TIDAL DATA BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前的潮汐变化分析

ANALYSIS OF CHARACTERISTICS OF PRECURSOR WAVE OF LOW FREQUENT IN SHANXI BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前山西前兆低频前驱波特征分析

Analysis of the Crust Deformations before and after the 2008 Wenchuan Ms8.0 Earthquake Based on GPS Measurements

STUDY ON IONOSPHERIC TEC ANOMALY PRIOR TO WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前电离层TEC异常分析

Dynamic variations of gravity and the preparation process of the Wenchuan Ms8.0 earthquake
重力场动态变化与汶川MS8.0地震孕育过程

Complicated phenomena of the Beichuan-Yingxiu surface fracture zone during Wenchuan Ms8.0 earthquake in Sichuan Province, China

MECHANISM ANALYSIS OF VERTICAL UPLIFT OF CRUST IN THE WEST OF LONGMENSHAN BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川地震震前龙门山以西地壳垂直隆升机理分析

SIMULATION OF DEFORMATION AND GRAVITY FIELD OF WENCHUAN Ms8.0 EARTHQUAKE
汶川地震形变场和重力场模拟分析

CRUSTAL DEFORMATION MEASURED BY MOBILE OBSERVATION BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前的流动形变

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GRAVITY DISTURBANCE BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川大地震前的重力扰动

Keywords: Wenchuan earthquake,Lacoste-ET gravimeter,gravity disturbance before earthquake,amplitude,period
汶川大地震
,Lacoste-ET重力仪,震前重力扰动,振幅,周期

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Abstract:

继1997年5月采用LacosteET-21重力仪在中国南极中山站观测发现South of Kermadec Islands 7.1级地震前的"重力扰动"现象之后,2008年5月又在武汉大地测量国家野外科学观测站LacosteET-20重力仪的观测资料中发现了汶川大地震的"重力扰动"现象:从大震前两天开始,"重力扰动"逐渐增大、最大振幅约为±0.8×10-8ms-2,直到大震发生。由于这两次监测的时间不同、地点不同、仪器不同(ET-21与ET-20),这就使得监测结果的可靠性得到了加强。初步认识是:在某些强震发生前两天左右,往往会出现较明显的"重力扰动",其振幅在±(1~2)×10-8ms-2左右、信号周期4~8s。

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