کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4731772 | 1356821 | 2011 | 8 صفحه PDF | دانلود رایگان |
The rupture process of the disastrous Sumatra–Andaman earthquake of 26 December 2004 was analyzed by array processes for teleseismic P-waves recorded by a dense broadband seismic array in Taiwan with epicentral distances of close to 31°. The azimuthal variation from the BATS array center to both ends of the rupture fault is approximately 21°, which is larger than that reported previously for seismic arrays used to image the rupture process of this earthquake, thereby providing a high spatial resolution in studying the source rupture behavior. Two array-processing methods were used to analyze teleseismic P-wave trains. Both analyses were based on data recorded by a broadband network, covering a region of 200 × 400 km, with the aim of evaluating the rupture behavior of the earthquake. Consistent results from both analyses indicate that the earthquake had a rupture duration exceeding 500 s, with major asperities encountered at 80, 260, and 330 s after the initiation of rupturing. We traced the ruptured fault for more than 1200 km from the point of initial rupture. The average rupture velocity was approximately 3.0 km/s and the major northward rupture propagation began at 80 s after the initiation of rupturing.
Research highlights
► The rupture process of the 2004 Sumatra–Andaman earthquake was analyzed by BATS.
► The results indicate that the earthquake had a rupture duration exceeding 500 s.
► The average rupture velocity was approximately 3.0 km/s.
► The major northward rupture propagation began at 80 s after the initiation of rupturing.
Journal: Journal of Asian Earth Sciences - Volume 40, Issue 3, 2 February 2011, Pages 762–769