Yogyakarta merupakan salah satu wilayah yang aktif gempabumi di Indonesia. Sumber gempabumi dapat berasal dari patahan lokal Opak di bagian timur ataupun zona subduksi pada bagian selatan Yogyakarta. Pembuatan peta mikrozonasi gempa sangat dibutuhkan untuk pertimbangan pembangunan infrastruktur atau bangunan yang tahan terhadap gempabumi. Upaya tersebut diharapkan dapat mengurangi dampak resiko yang mungkin ditimbulkan. Pada pertengahan tahun 2014 telah dilakukan pengukuran kecepatan gelombang geser (Vs30) di wilayah Yogyakarta khususnya wilayah Kabupaten Bantul dan Sleman. Pengukuran dilakukan terhadap 55 titik yang menyebar pada dua wilayah Kabupaten tersebut dengan jarak antar titik sekitar 1 sampai 5 km. Vs30 merupakan salah satu parameter yang digunakan dalam peta mikrozonasi. Pengukuran Vs30 dengan metode Multichannel Analysis of Surface Waves (MASW) menggunakan 24 geofon komponen vertikal dengan frekuensi 4.5 Hz. Nilai Vs30 memberikan informasi klasifikasi tanah permukaan sampai pada kedalaman 30 meter. Hasil interpretasi nilai Vs30 menunjukkan bahwa pusat kota yaitu Kotamadya Yogyakarta memiliki resiko amplifikasi gelombang yang relatif besar dengan nilai Vs30 berkisar antara 115-175 m/s. Pembangunan di wilayah ini sangat disarankan untuk memperhatikan aturan yang memenuhi standard sesuai rujukan SNI 1726-2012. Pada sisi lain, wilayah yang memiliki tanah permukaan klasifikasi padat dengan nilai rata-rata Vs30 antara 350-480 m/s adalah Kecamatan Kretek, Sanden, Pandak dan Bambanglipuro. Wilayah ini memiliki potensi untuk pelemahan atau atenuasi gelombang sehingga resiko kerusakan akibat gempabumi relatif lebih kecil.
Tectonic regimes in Indonesia caused the potential occurrence of the earthquake with the variated impact in Indonesia. It could be a threat to people, infrastructure, and economic aspects in Indonesia. All source types such as subduction zones are the big-one event that has been considered to anticipate as part of mitigation implementation for reducing potential victims. Almost all the regions in Indonesia have the probability to be a destructive region by earthquakes. One cluster that is related to that potential threat is Java Island and Sunda strait. The earthquake early warning system (EEWS) is a part mitigation system that has the goal to reduce the impact of destruction by infrastructure collapsed by the earthquake. BMKG (Meteorological Climatological and Geophysical Agency) has committed to making the area denser instruments distribution in the earthquake early warning area. It will spread close to the subduction zone and fault distribution Strong Motion accelerometers and intensitymeter sensors have been installed since 2010, then 2019 have been initiated to develop EEWS in Indonesia for instrument response. Sunda strait and the Southern part of Java Island are a region which has the potential to produce destructive earthquakes which have an impact until the capital city of Indonesia, Jakarta city. The sequence of EEWS development in Indonesia will be started with the utilization of EEWS for some kind of operational system in transportation. It is very important due to the direct impact to people's safety and their lives. Besides using the existing 303 sensors which consist of an accelerometer and intensitymeter, in this project BMKG will use a new 1 accelerometer and 50 intensitymeter sensors in Banten Province, West Java Province, Lampung Province and Jakarta Province. Processing module in this system uses a modified eBEAR module which has many different methods rather than the basic eBear module. The mode of dissemination system is developed by variated modes such as web-based, cube receiver, and mobile phone applications. While developing modules and applications, the empirical formula will be formed by the research of local characteristics to represent actual conditions in certain areas of Indonesia's Earthquake Early Warning System. The EWS is a big challenge for BMKG, due to many things that must be done in order to have a successful EEWS program according to Indonesian conditions.
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