TY - JOUR
T1 - 26th December 2004 great Sumatra-Andaman earthquake
T2 - Co-seismic and post-seismic motions in northern Sumatra
AU - Sibuet, Jean Claude
AU - Rangin, Claude
AU - Le Pichon, Xavier
AU - Singh, Satish
AU - Cattaneo, Antonio
AU - Graindorge, David
AU - Klingelhoefer, Frauke
AU - Lin, Jing Yi
AU - Malod, Jacques
AU - Maury, Tanguy
AU - Schneider, Jean Luc
AU - Sultan, Nabil
AU - Umber, Marie
AU - Yamaguchi, Haruka
N1 - Funding Information:
We thank the Presidents of Ifremer and Institute Paul-Emile Victor (IPEV) for their constant supports and encouragements to achieve on a short notice the “Sumatra Aftershocks” cruise onboard the R/V Marion Dufresne. We thank Yvon Balut (IPEV), Pierre Cochonat (Ifremer), John Ludden (Institut National des Sciences de l'Univers) and Jean-Paul Montagner (Direction Générale de la Recherche et de l'Innovation) for their support. The Indonesian Agency for the Assessment and Application of Technology (BPPT) is greatly acknowledged for its help and support during the planning stage of the cruise. The French Hydrographic Service (SHOM) helps to validate swath-bathymetric data. Bernard Ollivier (IPEV) and his technical team are particularly acknowledged for their dedicated work at sea. We thank Bob Engdahl for providing his relocated teleseismic events in the Sumatra region. We thank Jo Curray, Jamie Austin and an anonymous reviewer for their careful and constructive reviews. Financial supports were provided by the Agence Nationale de la Recherche (ANR), the Délégation Inter-ministérielle pour le Tsunami (DIPT), Ifremer and IPEV.
PY - 2007/11/15
Y1 - 2007/11/15
N2 - Trench-parallel thrust faults verging both landward and seaward were mapped in the portion of wedge located between northern Sumatra and the Indian-Indonesian boundary. The spatial aftershocks distribution of the 26th December 2004 earthquake shows that the post-seismic motion is partitioned along two thrust faults, the Lower and Median Thrust Faults, the latter being right-laterally offset by a N-S lower plate fracture zone located along the 93.6° N meridian. Between February 2005 and August 2005, the upper plate aftershock activity shifted from southeast of this fracture zone to northwest of it, suggesting that the lower plate left-lateral motion along the fracture zone may have induced a shift of the upper plate post-seismic activity along the Median Thrust Fault. Based on swath bathymetric and 3.5 kHz data, co-seismic deformations were weak close to the trench. Joint seismic-geodetic determination of slip distribution and time arrivals and heights of tsunami waves suggest that the co-seismic slip was maximum along a portion of the Upper Thrust Fault located north of the Tuba Ridge, suggesting that the Upper Thrust Fault might be a splay fault originated at the interplate fault plane. As the Upper Thrust Fault is steeper than the slab, the vertical motion of the adjacent Outer Arc and overlying water is much larger compared to the one resulting from slip on the megathrust alone, increasing tsunamogenic effects.
AB - Trench-parallel thrust faults verging both landward and seaward were mapped in the portion of wedge located between northern Sumatra and the Indian-Indonesian boundary. The spatial aftershocks distribution of the 26th December 2004 earthquake shows that the post-seismic motion is partitioned along two thrust faults, the Lower and Median Thrust Faults, the latter being right-laterally offset by a N-S lower plate fracture zone located along the 93.6° N meridian. Between February 2005 and August 2005, the upper plate aftershock activity shifted from southeast of this fracture zone to northwest of it, suggesting that the lower plate left-lateral motion along the fracture zone may have induced a shift of the upper plate post-seismic activity along the Median Thrust Fault. Based on swath bathymetric and 3.5 kHz data, co-seismic deformations were weak close to the trench. Joint seismic-geodetic determination of slip distribution and time arrivals and heights of tsunami waves suggest that the co-seismic slip was maximum along a portion of the Upper Thrust Fault located north of the Tuba Ridge, suggesting that the Upper Thrust Fault might be a splay fault originated at the interplate fault plane. As the Upper Thrust Fault is steeper than the slab, the vertical motion of the adjacent Outer Arc and overlying water is much larger compared to the one resulting from slip on the megathrust alone, increasing tsunamogenic effects.
KW - 2004 Sumatra-Andaman earthquake
KW - active thrust faults
KW - aftershocks
KW - co-seismic rupture
UR - http://www.scopus.com/inward/record.url?scp=35548951361&partnerID=8YFLogxK
U2 - 10.1016/j.epsl.2007.09.005
DO - 10.1016/j.epsl.2007.09.005
M3 - 期刊論文
AN - SCOPUS:35548951361
SN - 0012-821X
VL - 263
SP - 88
EP - 103
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
IS - 1-2
ER -