Long aseismic slip duration of the 2006 Java tsunami earthquake based on GPS data

• Published in: Earthquake science 2016-10, Vol.29 (5), p.291-298
• Main Authors: Raharja, Rio, Gunawan, Endra, Meilano, Irwan, Abidin, Hasanuddin Z., Efendi, Joni
• Format: Article
• Language: English
• Subjects: 2006 Java earthquake; Aseismic slip; Coastal environments; Decay; Earth and Environmental Science; Earth Sciences; Earthquakes; Geophysics/Geodesy; Global positioning systems; GPS; GPS数据; GPS观测; java; Mathematical analysis; Mathematical models; Research Paper; Rigidity; Seismic activity; Seismic engineering; Slip; Subduction (geology); Time series; Tsunamis; 巽他大陆; 无震滑动; 时间比; 海啸地震; 西南海岸
• ISSN: 1674-4519; 1867-8777
• DOI: 10.1007/s11589-016-0167-y

The Java earthquake occurred on July 17, 2006 with magnitude 7.8 associated to the subduction process of Indo-Australian plate and Sundaland block off southwestern coast of Java. We present postseismic deformation parameters of the 2006 Java earthquake analyzed using campaign GPS observation from 2006 to 2008 and continuous observation from 2007 to 2014. We use an analytical approach of logarithmic and exponential functions to model these GPS data. We find that the decay time in the order of hundreds of days after the mainshock as observed by 8 years＇ data after the mainshock for magnitude 7 earthquake is longer than a general megathrust earthquake event. Our findings suggest that the 2006 Java earthquake which is considered as ＂tsunami earthquake＂ most probably occurred in the region that has low rigidity and tends to continuously slip for long time periods.