ESTIMATES OF A-VALUE AND B-VALUE PARAMETERS FOR ANALYSIS OF SEISMICITY AND POTENTIAL HAZARD STUDIES OF EARTHQUAKE DISASTERS IN THE NORTH SUMATRA REGION. einstein e-j. [Internet]. 2026 Feb. 23 [cited 2026 Apr. 22];14(1):15-21. Available from: https://jurnal.unimed.ac.id/2012/index.php/einsten/article/view/61877