<![CDATA[Horizontal-to-Vertical Spectral Ratio (HVSR) microtremor analysis, first formalized by Nakamura in 1989, has become one of the most widely used non-invasive geophysical techniques for seismic microzonation and preliminary liquefaction potential assessment. Over the past decade, the number of studies applying HVSR has grown substantially across seismically active regions, including Indonesia, Turkey, Nepal, Chile, Iran, and China, driven by major earthquake events that exposed the critical role of local site effects and soil liquefaction in structural damage. Despite this proliferation, the literature remains fragmented across disciplinary silos, with inconsistent parameterization, limited methodological standardization, and uneven geographical representation. This systematic literature review, following the PRISMA 2020 protocol, synthesizes peer-reviewed studies published between 2016 and 2026 retrieved from Scopus-indexed and other credible scientific databases to map research trends, methodological developments, and thematic gaps in HVSR applications for seismic microzonation and liquefaction assessment. The review traces the evolution from conventional single-station vulnerability-index approaches toward inversion-based shear-wave velocity modelling and, more recently, machine-learning-assisted interpretation. Key gaps identified include the lack of standardized amplification-factor interpretation, limited validation of HVSR-derived liquefaction indices against in-situ penetration data, underrepresentation of long-term temporal monitoring, and insufficient integration with dense low-cost sensor networks. Future research directions are proposed, including multi-method joint inversion, artificial-intelligence-assisted hazard mapping, and the development of internationally harmonized interpretation protocols.]]>
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