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All Journal Phi : Jurnal Pendidikan Fisika dan Terapan Jurnal Pertahanan dan Bela Negara Jurnal Meteorologi dan Geofisika
Sudibyo, Reno
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Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Law, Crime, Criminology & Criminal Justice Physics Social Sciences Other

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Network-Based Equity Evaluation of Tsunami Evacuation Access for a Megathrust Scenario in Palabuhanratu: English Sudibyo, Reno; Kurniadi, Anwar; Subiyanto, Adi; Ramadhan, Fajar Gilang
Jurnal Meteorologi dan Geofisika Vol. 26 No. 2 (2025)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v26i2.1196

Abstract

We present a network-based equity evaluation of tsunami evacuation access for a megathrust scenario in Palabuhanratu, quantifying both individual safety attainment and the spatial distribution of access. By overlaying physics-based inundation data with a road graph, we compute multimodal time-to-safety and isochrones, summarizing village-level access through overall reachability (RR), Gini, and hazard-weighted Gini (Gini*) indices. Evacuation time allowances (ETAs) are set at 22, 18, and 15 minutes—validated against site-specific arrival modeling and real-world departure observations from the 2024 Noto event—revealing a critical temporal tipping point. While an ETA of 22 minutes ensures total reachability (RR=1.00) with low inequality, tightening the window to 18 and 15 minutes sharply reduces RR and increases Gini* scores. Furthermore, the addition of an alternative Tsunami Evacuation Area (TEA) at Smile Hill yields localized time savings and minor gains in specific clusters at 22 minutes, yet provides no systemwide benefit at shorter ETAs, indicating that time scarcity dominates access during tight windows. Methodologically, this study employs "beat-the-wave" logic and least-cost routing on OSMnx/NetworkX graphs, offering a reproducible screening tool that integrates access, fairness, and hazard emphasis for TEA design under time-critical evacuation constraints.
Beyond Site Effects: Azimuthal Dependence of Ground Motion Residuals in the Volcanic Arc and Sedimentary Basins of West Java, Indonesia Sudibyo, Reno; Wijayanto, Wijayanto; Gustono, Sandy Tri
Jurnal Phi: Kurnal Pendidikan Fisika & Terapan Vol 12 No 2 (2026)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v12i2.34186

Abstract

The complex tectonic setting of West Java, characterized by the interaction between the Sunda volcanic arc and deep sedimentary basins, presents significant challenges for seismic hazard assessment. This study recalibrates a local Ground Motion Prediction Equation (GMPE) using a hybrid regression strategy to isolate non-ergodic path effects. We implemented a constrained regression for Site Class C fixing the saturation parameter d = 5.80 to match the Class D baseline and applied site-term corrections for Class B. Our results reveal a weak correlation between residuals and  (R = 0.215), suggesting that shallow soil velocity is a suboptimal proxy for ground motion variability in this region. Instead, a distinct azimuthal anisotropy emerged, characterized by a dipolar residual pattern. Significant high-frequency attenuation (negative residuals) was identified in azimuths crossing the Quaternary Volcanic Arc, likely driven by multiple scattering in fractured magmatic media. Conversely, systematic amplification (positive residuals) was observed towards the Jakarta and Bandung Basins, consistent with deep basin resonance. These findings underscore the necessity of integrating azimuthal path terms into regional hazard models. Moving beyond 1D site-effect proxies is critical for enhancing the accuracy of Earthquake Early Warning (EEW) systems and urban seismic mitigation in West Java’s densely populated basins.
SPATIAL IDENTIFICATION OF CRITICAL LOGISTICS INFRASTRUCTURE AS NATIONAL VITAL OBJECTS: A NETWORK RESILIENCE APPROACH TO MEGATHRUST CONTINGENCIES Sudibyo, Reno; Kurniadi, Anwar; Tawakal, Moh. Iqbal
Jurnal Pertahanan dan Bela Negara Vol 16, No 1 (2026): Jurnal Pertahanan dan Bela Negara
Publisher : Republic of Indonesia Defense University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33172/jpbh.v16i1.20167

Abstract

PASTE/TEXT YOUR ABSTRAX TEXT HEREThe looming threat of a Megathrust earthquake and tsunami along the southern coast of Java compromises not only human safety but also the operational readiness of regional defense and national security. While existing literature predominantly focuses on outbound evacuation flows, there is a critical gap in assessing the resilience of inbound logistics supply chains essential for emergency response operations. This study aims to identify strategic road segments qualifying as National Vital Objects and to delineate isolated territories necessitating Military Operations Other Than War (MOOTW). By employing a spatial network science approach, specifically utilizing Betweenness Centrality algorithms and Network Robustness simulations within the Palabuhanratu road network, this research models the systemic breakdown of access under tsunami inundation scenario, by applying a binary failure threshold of flow depth hmax 0.3m. The quantitative analysis identifies "Jalan Lintas Jabar Selatan" as the critical logistics backbone, exhibiting the highest vitality score of 0.19, representing the dominant outlier compared to other arterial corridors in the network.  Concurrently, the hazard simulation reveals the formation of tactical isolation clusters in Citarik and Palabuhanratu, where 22.45% of the network nodes experience total access severance (cut-off). These findings underscore the strategic imperative for establishing joint contingency plans that integrate air-bridge and maritime access capabilities to ensure the continuity of national defense logistics during crisis contingencies.
Co-Authors Gustono, Sandy Tri Kurniadi, Anwar Ramadhan, Fajar Gilang Subiyanto, Adi Tawakal, Moh. Iqbal WIJAYANTO WIJAYANTO