地震面波双台法配对条件分析  

The matching conditions analysis of seismic surface wave of interstation method

作　　者：李川[1,2] 蒋婵君[1,2,3,4] 曾高福 王有学 LI Chuan;JIANG Chanjun;ZENG Gaofu;WANG Youxue(College of Earth Science,Guilin University of Technology,Guilin 541006,China;Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology,Guilin 541006,China;College of Architecture and Energy Engineering,Wenzhou University of Technology,Wenzhou 325035,China;Wenzhou Key Laboratory of Intelligent Lifeline Protection and Emergency Technology for Resilient City,Wenzhou University of Technology,Wenzhou 325035,China;China Nonferrous Metals(Guilin)Geology And Mining Co.,Ltd.,Guilin 541004,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541006 [2]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541006 [3]温州理工学院建筑与能源工程学院,浙江温州325035 [4]温州理工学院温州市韧性城市生命线工程智慧防护应急技术重点实验室,浙江温州325035 [5]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《桂林理工大学学报》2024年第4期589-597,共9页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(41574039);云南省重大科技专项计划项目(202302AC080003)。

摘　　要：针对地震面波双台法通常以震中到台站对的方位角差值α或远台站到震中和到近台站的后方位角差值β的大小作为双台配对的条件,但是不同研究者在α或β阈值的选取上并不统一的问题,提出一种将台站对的震中距之差与双台间距的比值定义为cosβ的新配对条件。以广西流动台阵的地震波观测数据为例,比较α、β和cosβ3种双台配对条件的优劣,结果表明:(1)台站对频散测量质量不一定随α的减小而增加,不建议以α作为双台配对条件;(2)采用β进行双台配对是可行的,配对效果优于α,与cosβ接近,但cosβ阈值设置更直观;(3)双台配对取值范围可参考β≤12°或者cosβ≥0.98;(4)近台站震中距在2500~5500 km时,频散质量更可靠。It is common to use the azimuth angle difference α from the epicenter to the two stations,or the backward azimuth angle difference β from the farther station to the epicenter and the nearer station,as the condition to match station pairs.However,different researchers differ in the selection of thresholds for difference α or difference β.In order to solve these problems,this study proposes a new pairing condition that defines the ratio of the difference between the epicenter and the distance between two stations as cos β.Based on recording data from the mobile seismic array in Guangxi,research on station pair matching is conducted using α,β and cos β.(1)The quality of dispersion measurement does not necessarily increase with the decrease ofα,so it is not recommended to useαto match station pair.(2)It is feasible to use β for station pair matching,and it is better than the value of α,the pairing effect of cos β and β is similar,but the setting of the threshold is more intuitive.(3)Station pair matching should refer to β≤12°or cos β≥0.98.(4)When epicenter distance of nearer station is 2500 to 5500 km,the quality of surface wave dispersion measurements is more reliable.

关 键 词：面波 频散 双台法 双台配对 群速度 

分 类 号：P315.3[天文地球—地震学]