Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
지진계의 데이터는 지진의 강도를 측정하는 데 사용됩니다.jijin-gyeui deiteoneun jijin-ui gangdeureul cheugjeonghaneun de sayongdoemnida.The seismographic data is used to measure the intensity of earthquakes.