|Title||Rupture evolution of the 2006 Java tsunami earthquake and the possible role of splay faults|
|Publication Type||Journal Article|
|Year of Publication||2017|
|Authors||Fan W.Y, Bassett D., Jiang J.L, Shearer PM, Ji C.|
|Type of Article||Article|
|Keywords||aftershocks; Back-Projection; earthquake; earthquakes; High-frequency Radiation; Java; m-w-greater-than-or-equal-to-7.0 megathrust; Nepal Earthquake; Seismology; slip; Splay faults; stress drop; sumatra-andaman earthquake; tohoku; tohoku-oki earthquake; tsunami; w 9.0; wave-forms|
The 2006 Mw 7.8 Java earthquake was a tsunami earthquake, exhibiting frequency-dependent seismic radiation along strike. High-frequency global back-projection results suggest two distinct rupture stages. The first stage lasted similar to 65 s with a rupture speed of similar to 1.2 km/s, while the second stage lasted from similar to 65 to 150 s with a rupture speed of similar to 2.7 km/s. High-frequency radiators resolved with back-projection during the second stage spatially correlate with splay fault traces mapped from residual free-air gravity anomalies. These splay faults also colocate with a major tsunami source associated with the earthquake inferred from tsunami first-crest back-propagation simulation. These correlations suggest that the splay faults may have been reactivated during the Java earthquake, as has been proposed for other tsunamigenic earthquakes, such as the 1944 Mw 8.1 Tonankai earthquake in the Nankai Trough.