Multiple Impact Surface Waves (MISW)—Improved Accuracy for Pavement System Thicknesses and Moduli vs. Spectral Analysis of Surface Waves (SASW)

Exploiting spectral differences between two acoustic imaging methods for the in situ evaluation of surface-breaking cracks in asphalt

“…Multiple Impact Surface Waves (MISW) is an alternative to the common MASW technique, which takes advantages of homogeneity, in order to obtain a multichannel record in an easier and faster way (see Figure 2). MISW employs a limited number of sensors (possibly only one as in the multichannel simulation with one receiver (MSOR)), compared to MASW [1], [27], [32] .…”

A study on issues relating to testing of soils and pavements by surface wave methods

“…For example, the earth's crustal composition has been profiled to great depth by analyzing surface waves from earthquakes [1], while shallow shear velocity evaluation for seismic site-response analysis has been studied using ambient vibrations via the refraction microtremor (ReMi) technique [2], or active vibrations via the spectral analysis of surface waves (SASW) [3] and multichannel analysis of surface waves (MASW) methods [4]. Additionally, SASW and the Multi-Source One Receiver (MSOR) method have been applied to nondestructive testing of pavements [5,6].…”

Advancements in active surface wave methods: modeling, testing, and inversion

“…The near-surface stiffness profiling of soils (e.g., Park et al 1999a), the method was also applied to pavements using multiple geophones by Park et al (2001b), and later using multiple accelerometers by Tertre et al (2010). To reduce the cost and inconvenience of coupling multiple receivers to pavement in MASW, the MSOR method was developed and applied to pavement stiffness profiling by Ryden et al (2001), Ryden et al (2002aRyden et al ( , 2002b, Park et al (2002), Olson and Miller (2010), and Lin and Ashlock (2011).…”

“…To implement an economical and minimally-invasive field-testing approach for measuring higher Rayleigh-wave modes, the multichannel simulation with one-receiver (MSOR) method can be used instead of a multi-channel one-source method such as MASW. As described in Chapter 4, the MSOR method simply reverses the roles of source and receiver in the MASW method, and has been successfully applied to nondestructive testing of pavements (Ryden et al 2002a, Olson and Miller 2010) and soils (Lin and Ashlock 2011). Compared to the MASW method, the MSOR method has several advantages: 1) greatly reduced instrumentation costs as only one sensor is required; 2) cost savings for data acquisition systems as only two channels are needed (one for the geophone and the other for a trigger); 3) the potential to be faster than MASW if an automated moveable impact source is available, as set-up time for a string of geophones and cables is eliminated; 4) ease in obtaining a 3-D profile as the source can readily be moved along different horizontal lines as shown in Figure 6.4, compared to reinstalling an entire string of geophones multiple times to cover the whole testing area for MASW.…”

“…,Olson and Miller 2010, Lin andAshlock 2014b) and soils (e.g., Ashlock 2011, 2014a). It has several advantages compared to the multi-receiver methods such as MASW, including: (1) greatly reduced instrumentation costs, since only one sensor and a two-channel data acquisition system are required; (2) increased portability, as a multichannel seismograph with external battery source and string of geophones are not required; (3) enabling minimally invasive measurement of higher modes using a single borehole for downhole receiver measurements with moving impacts at the surface (Lin and Ashlock 2014a, Ashlock and Lin 2014); (4) the potential to be faster than MASW if a movable servo-electric impact source is used, as the set-up time for a string of geophones and cables is eliminated; and (5) ease in obtaining 3-D stiffness profiles, as the source can readily be moved along different horizontal lines, compared to reinstalling an entire string of geophones multiple times to cover the entire testing area for MASW, as shown inFigure 6.4 in Chapter 6.…”