In this study, the Beibu earth fissure site in the northeastern part of Weihe Basin, which contains four nearly parallel earth fissures, was studied. A long straight microtremor measuring line, containing 49 measuring points across four earth fissures, was established to investigate the dynamic response of this site using Fourier spectrum, response acceleration spectrum, Arias intensity, and HVSR analyses. The main results are as follows: (1) The fundamental frequencies of 44 measuring points obtained from HVSR analysis are concentrated within 1.67 Hz–2.25 Hz, and the existence of the earth fissures has little effect on the fundamental frequency changes. (2) There is an amplification effect near a single earth fissure. The dynamic responses are large at the measuring points near the earth fissure, and the values decrease with increasing distance from the earth fissure. In areas between two adjacent earth fissures, these values decrease and are even lower than those in sites without amplification effects. (3) In this earth fissure site, the general area (or less affected area) and affected areas were delineated based on the amplification effect. In engineering applications, construction design should avoid these affected areas and existing structures should be reinforced to satisfy the seismic fortification requirements.

本次研究以渭河盆地东北部北部地裂缝遗址为研究对象，该地裂缝包含4条近乎平行的地裂缝。建立了一条长直的微动测量线，包含跨越四个地裂缝的 49 个测量点，利用傅里叶谱、响应加速度谱、Arias 强度和 HVSR 分析来研究该地点的动态响应。主要结果如下：（1）HVSR分析得到的44个测点的基频集中在1.67 Hz~2.25 Hz之间，地裂缝的存在对基频变化影响不大。(2)单个地裂缝附近存在放大效应。靠近地裂缝的测点动力响应较大，并且随着距地裂缝距离的增加，该值减小。在两个相邻地裂缝之间的区域，这些值减小，甚至低于没有放大效应的地点的值。（3）在该地裂缝场地，根据放大效应圈定一般区（或影响较小的区）和影响区。在工程应用中，建筑设计应避开这些影响区域，并对现有结构进行加固以满足抗震设防要求。