Investigasi Anomali TEC-Ionosfer Sebelum Letusan Gunung Lokon 14 Juli 2011 Menggunakan Metode Sliding Interquartile

Mount Lokon TEC-Ionosfer Anomaly, Sliding Interquartile Method, Eruption Precursor. Mount Lokon, located in North Sulawesi is among the most active volcanoes in Indonesia. Before the eruption occurred, there was a pre-eruption activity that triggered anomaly on Total Electron Content (TEC) in the ionosphere. TEC anomaly that mark the eruption are assumed as precursors of eruption that can be useful for disaster eruption mitigation efforts. The purpose of this study was to investigate the TEC anomaly before the Lokon eruption on July 14, 2011. Investigation of TEC by using the Sliding Interquartile method, the results showed that an TEC anomaly occurred 3 days before the eruption on July 11, 2011.These indicates the presence of pre-eruptive activity that affects the quantity of TEC in the ionosphere.