Abstract
The observation of ULF emission recorded in geomagnetic station is a powerful study of short term earthquake precursor. Anomalies that arise when there is no disturbance magnetic storm can be considered as precursors of the earthquake. Data used in this research were geomagnetic data recorded in LWA station as a main station, GSI station and TSI station as reference station and earthquake data. The earthquakes were on September 23, 2015 (Mw. 5.1), October 1, 2015 (Mw 5.4), and November 18, 2015 (Mw. 5.2). In determining onset time and lead time, polarization ratio Z/H at frequency of 0.012 Hz was used. Lead time detected were 4 days, 7 days, 4 days before the earthquakes respectively. The azimuth of anomalies ULF emission was investigated with Single Station Transfer Function (SSTF) that represent earthquake preparation zone. The azimuth of anomalous ULF emissions for each earthquakes were 217.3°, 208.5°, and 184.3°.
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