Marine Investigation of the Rupture Anatomy of the 2012 Great Earthquake (MIRAGE)
The magnitude-8.6 2012 Wharton Basin earthquake was the largest intraplate earthquake ever recorded in an ocean. Even with modern instrumentation, the anatomy of the rupture of this earthquake remains a matter of debate. In order to fully understand the rupture pattern and faults involved in this great earthquake, we plan to acquire a suite of marine geophysical datasets, including seismic reflection, bathymetry, 3.5 kHz etc. The first phase of Marine Investigation of the Rupture Anatomy of the 2012 Great Earthquake (MIRAGE) expedition took place in July 2016, and the second phase is scheduled to take place in 2017.
During the MEGA-TERA expedition in 2015, the team took high-resolution bathymetric and seismic reflection data, from which we discovered the fracture zone of the magnitude-8.2 aftershock that followed the magnitude-8.6 earthquake. Here, four fracture zones that were reactivated by the 8.6-magnitude Wharton Basin earthquake are shown.
- Earth Observatory of Singapore
Nugroho Hananto, LIPI
Helene Carton, Institut de Physique du Globe de Paris