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CMP analysis in surface wave detection
Release time: 2018-06-23

CMP 分析 CMP analysis in surface wave detection

Lin Hongyi

(Applied Geology Corporation)

CMP Analysis of Multi-channel Surface Wave Data

Koichi Hayashi

OYO Corporation ( OYO Corporation )

序言 Preamble

10m S 波速度模型,在结构体耐震设计方面是非常重要的。 It is very important to master the S- wave velocity model of 10m in the geological survey in the field of civil engineering in the seismic design of structures. PS 测井。 Previously, for this purpose, traditional PS logging in holes could be used . S 波速模型,所以能测量人工振动产生的表面波的位相速度,推断地盘的 S 波速度的手法(表面波探测)也能尝试应用。 On the other hand, the phase velocity of a surface wave (hereinafter referred to as Rayleigh wave) mainly reflects the S- wave velocity model of the site , so the phase velocity of the surface wave generated by artificial vibration can be measured, and the method of estimating the S- wave velocity of the site (surface wave detection) Also try to apply. So far, the surface wave detection carried out in China is to calculate the phase velocity by calculating the cross-correlation between the two seismographs, mainly by using a vibrator or the like to excite constant waves.

Park et al. 1999 )研究出了一种方法,将由重锤落下等冲击震源而激发的震波,通过设置在测量线上的多个地震仪进行采集后,根据频率领域的相对速度进行积分处理,将在时间 - 距离领域观测到的波形,直接转换成频率 - 位相速度领域(的数据)( MASW Multi-channel Analysis of Surface Waves )。 In response to this situation, Park et al. ( 1999 ) developed a method to collect the shock waves excited by the shock source such as the drop of the weight by multiple seismometers installed on the measurement line. The relative velocity is integrated, and the waveforms observed in the time - distance domain are directly converted into (data) in the frequency - phase velocity domain ( MASW : Multi-channel Analysis of Surface Waves ). Park et al. 1999 )提出,在两个地震仪数据的互相关中,不仅能直观分离困难的实体波和高次模式的表面波,而且具有能够防止空间图像失真问题的优点。 This method was proposed by Park et al. ( 1999 ). In the cross-correlation of two seismograph data, it can not only visually separate difficult solid waves and surface waves of higher-order modes, but also has the advantage of preventing distortion of spatial images. . 1999 )多次采用该方法,做成了二次元 S 波速度断面。 Xia et al. ( 1999 ) used this method many times to make a second-order S- wave velocity section.

Park et al.(1999) 中所指出的,需要将地震仪分布的长度范围增加。 With this method, in order to accurately determine the phase velocity in the low-frequency domain, as pointed out in Park et al. (1999) , the length range of the seismometer distribution needs to be increased. . 铃木, 2000 )。 However, as the length of the distribution increases, even if the velocity model in the same distribution range changes (the test data of the seismograph) will average it, which may reduce the resolution in the spatial direction ( Lin.Suzuki, 2000 ) . In order to improve the spatial resolution, it is necessary to determine the phase velocity in the shortest possible space, and this requirement is in contradiction with the requirement to collect data in the longest possible range for accurate speed determination. Here, the author proposes a solution to the contradiction between the two.

分析 2.CMP analysis

-1 表面波探测获取的测量记录例( a Figure -1 Example of measurement record obtained by surface wave detection ( a )

b And its relative velocity distribution in the frequency domain ( b )

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