Rancang Bangun Prototype Instrumen Pendeteksi Dini Tsunami Akibat Gempabumi dengan Memanfaatkan Prinsip Refleksi Gelombang

Abstract

Indonesia is one of the countries that categorized as a country with high level of vulnerability to tsunami disasters. The main cause of tsunamis in Indonesia is tectonic activity or earthquake, which caused more than 150.000 peoples died until early 2018. The high number of casualties is certainly cannot be separated from the absence of tsunami detection instrument from Indonesian sea and coupled with a lack of public knowledge regarding signs of tsunami, such as the recede of sea water level. The prototype of tsunami early detection instrument is designed with sensors which utilize the principle of wave reflection. Ultrasonic and doppler sensors are combined by applying the concept of transmitting and receiving the electromagnetic wave. Tests carried out on the tsunami condition engineering test model to see the ability of the instrument to obtain altitude data and speed of change in water level. Model velocity value of safe and danger condition of the tsunami is used in this research which is 0.02 m/s as the border between those 2 states. Both sensors are able to obtain the value of water level and speed of change in water level with an error rate of ±10-2 m/s.