“…Fixed-mode of MONICA switches on when the sensor nodes are fixed while they're monitoring physical parameters such as seismicity, dome growth, gas emission, spreading cloud and eruption ash, surface temperature, and also pyroclastic zone of the volcano [1,3,4]. This mode had shown satisfied result both in bandwidth management [3] for a 'small' and 'big' event of only seismicity activity in Merapi volcano [1,3,6] which has moderate deep seismicity with few earthquakes as the most prominent characteristic of this volcano [2]. The data could be 100% sent to the base station in 'small' event seismicity activity of Merapi with 6 ms average delay [1,4].…”