摘要
通过解算芦山地震周边20个CORS站的10 Hz数据,分析震时地表形变特征,探索水平位移峰值衰减规律并反演面波震级.结果表明：所有测站都产生了不同程度的震动,震动位移均为厘米级,震中距较小的QLAI、SCTQ和YAAN站受地震影响最大,水平位移峰值在50 mm左右,其他测站水平位移峰值在18 -28 mm范围内.高频GPS测定的水平位移峰值与震中距呈指数关系衰减.利用Gutenberg经验回归公式反演面波震级,结果为6.78,所用最短时间为震后142 s.
10 Hz global positioning system （GPS） observations of 20 continual operation reference system （CORS） sites nearby Lushan are used to analyze the ground moving characteristics, research the relationship between peak horizontal displacement（PHD） and estimate the magnitude. The results show all sites have had ground moving with centimeter-level, QLAI, SCTQ and YAAN sites are mainly affected by earthquake, PHD can reach approximately 50 mm, other sites are within 18 - 28 mm. The scaling relationship between PHD from GPS observations show that PHD amplitudes decay approximately with r^-1.66, where r is the epicentral distances of GPS sites. Magnitude inversion by the empirical relationship that Gutenberg deduced in 1945 show the result of Lushan earthquake is 6.78, and the shortest time to get the robust value is 142 s, which indicate that a robust magnitude can be estimated within a few minutes after an earthquake event by using high-rate GPS.
出处
《科学技术与工程》
北大核心
2015年第16期128-133,共6页
Science Technology and Engineering
关键词
芦山地震
高频GPS
地表形变
震中距
水平位移峰值
震级
Lushan earthquake high-rate GPS ground moving epicentral distance peak horizontal displacement magnitude
