The evaluation of local seismic response plays a fundamental role in post-disaster spatial planning, particularly in regions affected by landslides and characterized by soft sedimentary materials. This study analyzes the seismic response characteristics in a post-landslide area in Mendala Village, Brebes Regency, Central Java, to support the planning of permanent housing development. The Research area is situated within the Sedimentary Pliocene Formation, which is primarily composed of fine-grained clay sediments with intercalations of sandstone and limestone. These lithological conditions are widely recognized as sensitive to seismic-wave amplification and ground deformation under dynamic loading. Microtremor measurements were conducted at numerous observation points distributed across the planned residential development area. Ambient ground vibrations were recorded using a three-component seismometer under existing post-landslide conditions. The Horizontal-to-Vertical Spectral Ratio approach was applied to the recorded signals to determine the dominant frequency and amplification factor of the near-surface soil layers. These parameters reflect the dynamic behavior of subsurface materials and are commonly used as indicators of local seismic response. The derived parameters were subsequently integrated to estimate the seismic vulnerability index, peak ground acceleration, and ground shear strain, thereby enabling a comprehensive assessment of the site's seismic hazard potential. The analysis results reveal pronounced spatial variations in seismic response, even within the same geological unit. Zones characterized by low dominant frequency values and high amplification levels are mainly distributed in the northern to northeastern sectors of the study area. These conditions indicate the presence of thick, relatively soft sediment layers with pronounced impedance contrasts between subsurface strata. Such conditions contribute to increased seismic vulnerability and a higher potential for ground deformation. These areas are associated with elevated peak ground acceleration and moderate ground shear strain, suggesting the potential for surface cracking, differential settlement, and progressive degradation of shallow soil layers under seismic shaking. In contrast, the southwestern part of the study area exhibits higher dominant frequency values, lower amplification, and reduced seismic vulnerability. These characteristics reflect more compact sedimentary conditions and a more stable seismic response. As a result, this sector is considered relatively suitable for permanent housing development, provided that standard earthquake-resistant design principles are applied. The differences observed between sectors highlight the importance of site-specific seismic response evaluation in areas with heterogeneous sedimentary conditions. The integration of microtremor-based seismic parameters provides a practical framework for preliminary seismic response zoning and soil vulnerability assessment. This approach enables the identification of relatively safe zones and areas requiring additional engineering mitigation measures, such as soil improvement, foundation reinforcement, or structural design modifications. The results of this study represent the current ground conditions following a landslide event and are intended as an initial assessment to support risk-informed decision-making. Further detailed geotechnical investigations and site-specific engineering analyses are recommended before the final implementation of permanent housing construction.