11:20 〜 11:40
[DM-03] Earthquake Epicenter and Hypocenter on 4 and 24 September 2020 Based on Earthquake Waveform Data Geophysical Station, BMKG Yogyakarta, Indonesia
ABSTRACT
It is known that one of the most unpredictable and damaging disasters was an earhquake. Faults or tectonic activity were closely related to the earthquake. Due to confluence of three major plates of the world, namely Indo-Australia, Pacific, and the Eurasia Plates Indonesia became an earthquakes-prone country, which often experienced earthquakes of large and small magnitudes. Determining the epicenter and the hypocenter of the earthquake were the first step taken to carry out earthquake disaster mitigation. The circle method using Python can be used to find earthquake epicenter and hypocenter. Based on this method, the intersection of the circles were indentified as the epicenter’s position in the form of longitude and latitude, while the hypocenters were obtained from the Pythagorean calculation between the radius and the epicenter distance. In this study, the three earthquake events in Yogyakarta and its surroundings with magnitudes of 4.3 M, 4.4M, and 4.7 M which were used, were obtained from BMKG Yogyakarta. This earthquake was recorded by 7 seismometers. Three earthquake epicenters were obtained based on the processing using the circle method. An earthquake with a magnitude of 4.3 has a longitude of 111.28 and latitude of -8.91879 with earthquake depth 74 km, a magnitude of 4.4 has a longitude of 110.337 and a latitude of -9.94828 with earthquake depth 54 km, a magnitude of 4.7 has a longitude of 109.975 and a latitude of -9.25405 with earthquake depth 36 km.
KEY WORDS: earthquake, epicenter, hypocenter latitude, longitude, and magnitude
It is known that one of the most unpredictable and damaging disasters was an earhquake. Faults or tectonic activity were closely related to the earthquake. Due to confluence of three major plates of the world, namely Indo-Australia, Pacific, and the Eurasia Plates Indonesia became an earthquakes-prone country, which often experienced earthquakes of large and small magnitudes. Determining the epicenter and the hypocenter of the earthquake were the first step taken to carry out earthquake disaster mitigation. The circle method using Python can be used to find earthquake epicenter and hypocenter. Based on this method, the intersection of the circles were indentified as the epicenter’s position in the form of longitude and latitude, while the hypocenters were obtained from the Pythagorean calculation between the radius and the epicenter distance. In this study, the three earthquake events in Yogyakarta and its surroundings with magnitudes of 4.3 M, 4.4M, and 4.7 M which were used, were obtained from BMKG Yogyakarta. This earthquake was recorded by 7 seismometers. Three earthquake epicenters were obtained based on the processing using the circle method. An earthquake with a magnitude of 4.3 has a longitude of 111.28 and latitude of -8.91879 with earthquake depth 74 km, a magnitude of 4.4 has a longitude of 110.337 and a latitude of -9.94828 with earthquake depth 54 km, a magnitude of 4.7 has a longitude of 109.975 and a latitude of -9.25405 with earthquake depth 36 km.
KEY WORDS: earthquake, epicenter, hypocenter latitude, longitude, and magnitude
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