Monitoring of earthquake precursors in Yogyakarta

Earthquake precursors continue to be developed by researchers to try to predict earthquakes, one of which is Radon. The monitoring of radon gas in the ground continues to be carried out in Yogyakarta and its surroundings as one of the earthquake mitigation efforts. This study aims to analyze the variation of radon gas and seismic activity as well as the emergence of local earthquake precursors that occurred in Yogyakarta and its surroundings. Radon gas monitoring is carried out in two locations, namely in the Pundong and Piyungan areas. Earthquake activity was recorded from the BMKG earthquake catalog. The radon anomaly study to determine the existence of earthquake precursors was carried out using the correlation method. Radon gas anomalies are determined when there is an increase in the Radon concentration graph. The results show that an increase in radon gas emissions is correlated with an increase in earthquakes' frequency. The correlation method's application indicates the presence of radon gas anomalies as a precursor to earthquakes around the Opak Fault. Further research is needed to see the correlation and consistency of radon gas anomalies with earthquake events around the Opak Fault.