Evaluation of existing earthquake prediction for lead time parameter using geomagnetic anomaly (case study: Sumatra region and its vicinity)

Currently, the earthquake is still unpredictable geomagnetic sensors since 2013. We observed the magnetic spectrum anomaly for Z/H components, using filter 0.01– 0.02 Hz, and azimuth±22.5° from the geomagnetic sensor. Based on the geomagnetic anomaly data along 2017-2018, we have declared 99 anomalies data as precursors and determined time, potential zone, and magnitude of an earthquake will occur around in Sumatra Region. The optimum predictable accuracy of earthquake prediction for lead time parameters about 4-45 days after anomaly is 64 %., especially for the short-term period. Many methods have been developed to predict earthquakes, but still cannot answer, when, where, and how big earthquake will occur. National for Meteorology, Climatology, and Geophysics Agency (BMKG) cooperated with Kyushu University and Chiba University to carry out earthquake precursor studies in the Sumatra region in the last 5 years ago using the geomagnetic data. We had installed 7