Nalbant Suleyman S, Steacy Sandy, Sieh Kerry, Natawidjaja Danny, McCloskey John
School of Environmental Sciences, University of Ulster, Coleraine, County Derry BT52 1SA, UK.
Nature. 2005 Jun 9;435(7043):756-7. doi: 10.1038/nature435756a.
On 28 March 2005 the Sunda megathrust in Indonesia ruptured again, producing another great earthquake three months after the previous one. The rupture was contiguous with that of the December 2004 Sumatra-Andaman earthquake, and is likely to have been sparked by local stress, although the triggering stresses at its hypocentre were very small - of the order of just 0.1 bar. Calculations show that stresses imposed by the second rupture have brought closer to failure the megathrust immediately to the south, under the Batu and Mentawai islands, and have expanded the area of increased stress on the Sumatra fault. Palaeoseismologic studies show that the Mentawai segment of the Sunda megathrust is well advanced in its seismic cycle and is therefore a good candidate for triggered failure.
2005年3月28日，印度尼西亚的巽他逆冲断层再次发生破裂，在前一次大地震发生三个月后又引发了一场强烈地震。此次破裂与2004年12月苏门答腊—安达曼地震的破裂区域相邻，尽管震源处的触发应力非常小，仅约为0.1巴，但很可能是由局部应力引发的。计算表明，第二次破裂所施加的应力使紧邻南部的巴都岛和明打威群岛下方的巽他逆冲断层更接近破裂状态，并扩大了苏门答腊断层上应力增加的区域。古地震学研究表明，巽他逆冲断层的明打威段在地震周期中已发展到后期，因此很有可能因触发而发生破裂。
