Rupture evolution of the 2006 Java tsunami earthquake and the possible role of splay faults

TitleRupture evolution of the 2006 Java tsunami earthquake and the possible role of splay faults
Publication TypeJournal Article
Year of Publication2017
AuthorsFan W.Y, Bassett D., Jiang J.L, Shearer PM, Ji C.
JournalTectonophysics
Volume721
Pagination143-150
Date Published2017/11
Type of ArticleArticle
ISBN Number0040-1951
Accession NumberWOS:000418309400010
Keywordsaftershocks; 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
Abstract

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.

DOI10.1016/j.tecto.2017.10.003
Short TitleTectonophysics
Student Publication: 
No