Tujuan penelitian ini ingin mengetahui aspek kesehatan (penyakit), budaya (gotong royong) dan ekonomi (permukiman dan potensi sumber daya alam) dari peristiwa banjir lahar dingin Merapi di Kota Yogyakarta. Jenis penelitian ini adalah penelitian deskriptif kuantitatif. Teknik pengumpulan data menggunakan dokumentasi, wawancara, dan observasi. Lokasi penelitian di Kelurahan Tegalpanggung dan Kelurahan Suryatmajan. Hasil penelitian menunjukkan bahwa penyakit yang muncul di lokasi penelitin adalah

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... enyakit batuk, diare, sakit kepala, kulit gatal dan demam. Puskesmas mendekatkan pelayanannya dengan mendirikan posko di dekat lokasi bencana. Kegotongroyongan warga terjadi pada saat banjir datang dan pascabanjir lahar dingin. Sementara warga lain menunggu bantuan, warga Kelurahan Tegalpanggung melakukan kerja bakti memasang karung pasir saat banjir dan meninggikan talud secara swadaya. Kerusakan permukiman berupa rusaknya bangunan rumah, sumur menjadi kotor, fasilitas olahraga dan balai pertemuan tertimbun pasir. Warga belum memanfaatkan potensi sumber daya alam pasir, kerikil, dan batu secara ekonomis, baru sebatas untuk keperluan sendiri. Kata Kunci: karakter gotong royong, lahar dingin, bantaran sungai, dan Yogyakarta. Abstract: Mutual Cooperation Character of The Citizens in Facing Merapi Cold Lava Flood Disaster in Yogyakarta. The purpose of this research was to determine the health aspects (disease), cultural (mutual aid) and economic (settlements and natural resources) from Merapi cold lava flood in the city of Yogyakarta. This research is descriptive quantitative research. Data collection techniques using documentation, interviews, and observations. Location of the study, in the Village Tegalpanggung, and Village Suryatmajan. The results showed that the disease appeared in the location of the study was disease cough, diarrhea, headache, skin itching and fever. Health center services by establishing a command post set up near the disaster site. Mutual cooperation of citizens, occurs when the floods come and post cold lava flood. While other residents waiting for help, residents in the Village Tegalpanggung perform voluntary work by placing sandbags during floods and elevate talud independently. Damage in the form of damage to residential houses, wells become dirty, sports facilities and meeting places buried in the sand. Citizens have not been utilizing the natural resources of sand, gravel, and stone economically, merely for their own purposes.