[Estimation of The Threat of Earthquake and Tsunami in Pidie Jaya Regency to Support National Security]. Bencana merupakan suatu ancaman non-militer dan nyata yang dihadapi dunia saat ini. Bencana mengancam keselamatan masyarakat yang pada akhirnya mengancam keamanan nasional suatu negara, termasuk Indonesia. Ancaman nyata yang saat ini dirasakan oleh masyarakat Indonesia adalah peningkatan kejadian bencana yang dirasakan hampir diseluruh wilayah Indonesia. Kabupaten Pidie Jaya yang merupakan bagian dari Provinsi Aceh juga memiliki ancaman multi bencana seperti gempabumi dan tsunami. Gempabumi yang terjadi di Pidie Jaya disebabkan oleh aktivitas Sesar Pidie dengan arah bidang patahan mendatar atau strike-slipe. Selain itu, terdapat Zona Megathrust Sumatera dan Sesar Besar Sumatera yang berada di Provinsi Aceh dengan aktivitas kegempaan yang dapat berpotensi tsunami. Dalam penelitian ini dilakukan suatu simulasi tsunami dengan output wilayah-wilayah yang berpotensi tsunami berserta run up atau ketinggian air tsunami akibat gempa di Zona Megathrust Aceh-Andaman. Penelitian ini menggunakan metode kualitatif (deskriptif analisis) sebagai desain penelitian. Penelitian dilakukan pada 18 Maret 2021 di ruang operasional InaTEWS (Indonesia Tsunami Warning System) Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) menggunakan bantuan software TOAST (Tsunami Observation and Simulation Terminal).  Dari seluruh rangkaian pengolahan dan analisis data didapatkan hasil bahwa Zona Megathrust Aceh-Andaman berpotensi tsunami dengan run up (ketinggian air tsunami) yang paling tertinggi sebesar 10,5 meter di Meulaboh, Kab. Aceh Barat, 5,5 meter di Kota Sabang, dan 3 meter di Kabupaten Pidie Jaya dengan waktu tiba tsunami (golden time) sekitar 24 menit 55 detik. Kajian atas estimasi gempabumi dan tsunami ini dapat dijadikan sebagai sumber informasi dalam penentuan kebijakan BPBD Pidie Jaya dalam upaya mitigasi bencana untuk melindungi masyarakat Pidie Jaya dan mewujudkan keamanan nasional.

Bengkalis Regency is located on the north coast of Riau Province, where the coastal area is very vulnerable to the threat of maritime disasters. Global warming can result in natural disasters, which means catastrophe on earth. Global warming causes an increase in the temperature of the earth's surface. This study aims to analyze the progress of the coastline and sea level rise that occurs and their impact on the degradation of Mangrove land on the north coast of Bengkalis Island, Riau Province. The research method used is the quantitative method through analysis of satellite images to map predictions of abrasion in the future. Data processing is carried out using satellite image data with different temporal, namely 1991, 2002, 2012, and 2021. Analysis of shoreline change predictions is carried out using the Digital Shorelines Analysis System Method. Utilization of GIS data can be used to map areas with the potential for abrasion, and make anticipatory measures against abrasion that may occur. In Bengkalis Regency itself, several efforts have been made by the local government, namely through mangrove planting programs, and increasing public awareness.

The pentahelic synergy must be carried out by the Pandeglang Regency  to speed up the recovery process after the tsunami disaster. If it doesn't work, it will disrupt the resilience of the community in facing the coming disaster. This study used a qualitative descriptive design method. The purpose of this study was to analyze how far the pentahelic synergy in post-tsunami recovery is to support community resilience in facing disasters in Pandeglang Regency. The research was conducted at Carita Beach, Labuan, Panimbang and Sumur of Pendeglang Regency with 16 informants. The research data were analyzed in four steps. The results showed that the implementation of pentahelic synergy carried out by BPBD Pandeglang Regency in achieving post-tsunami recovery was in the good or effective category. and community resilience in dealing with disasters is in a strong position. The conclusion is that the effect of pentahelic synergy is able to increase the resilience of the community which is dominated by psychological and social aspects, so that it will tend to lead to the strengthening of the existing religious culture that supports government programs

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