<![CDATA[Local seismic site response is influenced by variations in near-surface stiffness and subsurface dynamic characteristics. This study characterizes the spatial variability of local seismic response in Setiling Village, Central Lombok, Indonesia, by integrating VS30 and Horizontal-to-Vertical Spectral Ratio (HVSR) parameters. Twenty observation points were analyzed using previously established VS30 data and ambient-noise microtremor records processed using the HVSR method to obtain the predominant frequency (f?) and peak spectral amplitude (A?). The empirical seismic response index (Kg) was calculated from the HVSR parameters. Spatial distributions were mapped using inverse distance weighting (IDW) interpolation, and pairwise relationships between VS30 and the HVSR-derived parameters were examined to identify spatial response patterns. The results reveal spatial contrasts between areas characterized by relatively higher VS30 and predominant frequency and lower A? and Kg, and areas exhibiting the opposite pattern. Three relative site-response domains—High, Intermediate, and Low—were delineated qualitatively based on the integrated spatial patterns of VS30, f?, A?, and Kg, without applying formal statistical thresholds or predefined numerical classification boundaries. The integration provides complementary information by combining average shear-wave velocity in the upper 30 m, represented by VS30, with the predominant frequency and relative peak amplitude derived from HVSR analysis. The Kg index further summarizes the amplitude–frequency characteristics according to the adopted formulation. This approach helps identify spatial differences in spectral behavior that may not be fully represented by VS30 alone. The resulting domains describe relative site-response conditions rather than standardized soil classes, deterministic earthquake-hazard levels, or structural-vulnerability classes. The findings provide a preliminary basis for prioritizing further site-specific seismic investigations in heterogeneous volcanic terrain.]]>
