Site response measurements and implications to soil liquefaction potential using microtremor H/V in Greater Metro Manila, Philippines

This research explores the use of microtremor horizontal-to-vertical spectral ratio (H/V) in obtaining site response characteristics and investigating its relationship with soil liquefaction potential in Greater Metro Manila. We performed single station microtremor measurements in 61 sites along with in situ geotechnical techniques to verify liquefaction potential. The resulting 238 spectral curves were classified according to dominant features and subsequently grouped with the calculated liquefaction potential index (LPI) of the soil. Based on a robust comparison of obtained primary parameters, it is revealed that the shape of the H/V curve, its predominant period and relative amplitude are fundamentally linked to the spatial variability and the shear strength of soils. Therefore, areas of high seismic demand can also have high liquefaction potential, and vice versa. We then correlated the predominant period with the LPI of the soil and extracted a boundary using simple statistical techniques to classify high and low potential for liquefaction subsequently validating its use as a complementary tool for rapid site-specific liquefaction assessment. Such findings are a novel contribution to liquefaction studies employing rapid techniques since the application of microtremors to liquefaction in the Philippines has not been practiced extensively.

Automated summary

This research investigates the use of microtremor horizontal-to-vertical spectral ratio (H/V) to obtain site response characteristics and explore its relationship with soil liquefaction potential. By analyzing the H/V curves and the liquefaction potential index (LPI) of the soil, the study reveals that the shape, predominant period, and relative amplitude of the H/V curve are fundamentally linked to the spatial variability and shear strength of soils. The research also validates the use of the predominant period as a complementary tool for rapid site-specific liquefaction assessment.