Abstract 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.

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

Editorial

Mapping and characterization of the liquefaction impacts of the July and October 2022 earthquakes in Northwestern Luzon, Philippines

A coastal portion of the Greater Metro Manila Area, Philippines, is situated primarily on Quaternary Alluvium deposits which are likely to liquefy. Liquefaction is a hazard that occurs when loosely packed, saturated sediments at or near the ground surface lose its strength caused by an earthquake. Currently, the standard in determining a site’s soil properties and liquefaction potential is by using conventional geotechnical techniques such as the Standard Penetration Test (SPT). However, this method has disadvantages in terms of cost, logistics, and as well as workforce. The Screw Driving Sounding (SDS) test was developed to estimate equivalent SPT parameters such as N-value and Fines Content which are then used for liquefaction analysis. This paper presents the comparative analysis between SDS and SPT in selected schools in Greater Metro Manila Area, Philippines. Moreover, soil classification and site-specific liquefaction potential evaluation were also estimated using the data acquired from the SDS test. Overall, the result of the study proves that the SDS test is an effective alternative method for soil investigation and estimation of the liquefaction potential.

The use of screw driving sounding in soil assessment in Metro Manila, Philippines

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The use of screw driving sounding in soil assessment in Metro Manila, Philippines