期刊名称：Majalah Iptek = IPTEK : The Journal for Technology and Science
印刷版ISSN：0853-4098
电子版ISSN：2088-2033
出版年度：2019
卷号：30
期号：2
页码：41-44
DOI：10.12962/j20882033.v30i2.5006
出版社：IPTEK
摘要：Main earthquake with magnitude Mw 6.3, has been occurred in the West of Halmahera Island, Northern
Molucca on June 7th, 2016. The activity of the Pacific plate, Eurasia plate and Indo-Australia plates trigger some
earthquake around Halmahera. The purpose of the current study was to determine the Coulomb stress change of the main
earthquake and predict the aftershocks’ location around it. For understanding an interaction of the faults, this study used
Coulomb stress change model. Three component seismic waveform data recorded by TNTI station within 132 km, SANI
station within 381.2 km, LUWI station within 478.3 km, and TOLI2 station within 617.6 km of the epicenter. This study
used software ISOLA-GUI to obtain the parameters of the earthquake source. The parameters of the earthquake source
were then used to determine fracture orientation, length, width and slip displacement. It was also used to calculate the
Coulomb stress changes around the main shock, using software Coulomb 33. The result shows that the orientation of the
earthquake fault has a dip angle of 48° to the horizontal plane and has a strike of 210° against the North. The fault length is
19.49 km, the fault width is 11.59 km and slip displacement is 49.43 cm. Based on plotting result, the main earthquake in
Northern Molucca on June 7th, 2016 has positive Coulomb stress change that spread across the Northeast to the Southwest.
This change is likely triggered three aftershocks with a range of Mw 4.7 to 6.2.
其他摘要：Main earthquake with magnitude Mw 6.3, has been occurred in the West of Halmahera Island, Northern Molucca on June 7th, 2016. The activity of the Pacific plate, Eurasia plate and Indo-Australia plates trigger some earthquake around Halmahera. The purpose of the current study was to determine the Coulomb stress change of the main earthquake and predict the aftershocks’ location around it. For understanding an interaction of the faults, this study used Coulomb stress change model. Three component seismic waveform data recorded by TNTI station within 132 km, SANI station within 381.2 km, LUWI station within 478.3 km, and TOLI2 station within 617.6 km of the epicenter. This study used software ISOLA-GUI to obtain the parameters of the earthquake source. The parameters of the earthquake source were then used to determine fracture orientation, length, width and slip displacement. It was also used to calculate the Coulomb stress changes around the main shock, using software Coulomb 33. The result shows that the orientation of the earthquake fault has a dip angle of 48° to the horizontal plane and has a strike of 210° against the North. The fault length is 19.49 km, the fault width is 11.59 km and slip displacement is 49.43 cm. Based on plotting result, the main earthquake in Northern Molucca on June 7th, 2016 has positive Coulomb stress change that spread across the Northeast to the Southwest. This change is likely triggered three aftershocks with a range of Mw 4.7 to 6.2.
关键词：Aftershock;Coulomb stress change;earthquake;Halmahera Island and moment tensor
