Space and time evolution of rupture and faulting during the 1999 Izmit (Turkey) earthquake

被引:130
作者
Bouchon, M
Toksöz, MN
Karabulut, H
Bouin, MP
Dietrich, M
Aktar, M
Edie, M
机构
[1] Univ Grenoble 1, Lab Geophys Interne & Tectonophys, F-38041 Grenoble, France
[2] MIT, Earth Resources Lab, Cambridge, MA 02142 USA
[3] Kandilli Observat, TR-81220 Istanbul, Turkey
[4] Bogazici Univ, TR-81220 Istanbul, Turkey
[5] Inst Phys Globe, F-75252 Paris, France
[6] Tubitak Res Ctr, Gebze, Turkey
关键词
D O I
10.1785/0120000845
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We use the records of the ground motion obtained at near-fault accelerometers to study the space and time evolution of rupture and faulting during the Izmit earthquake. We find that the rupture propagated at the sub-Rayleigh speed of about 3 km/sec on the western and eastern segments of the fault, but that the central segment (Izmit-Sapanca Lake-Sakarya), nearly 50 km long,, broke at the supershear speed of about 4.8 km/sec. This value, within the range of uncertainties, is the one theoretically predicted (root2V(S)) in fracture dynamics for stable shear crack growth at intersonic speed. We infer an average fault slip of about 2.9 in over a total rupture length of about 150 km, with the largest values (of up to 6 m) occurring in the Golcuk area to the west and in the Sakarya region to the east. The strong-motion data also indicate that the slip diminished gradually to the west beyond the Hersek peninsula over about 30 km, whereas it stopped abruptly at depth at the termination of the eastern (Karadere) segment. The slip duration is between 2 and 4 sec, except in the hypocentral area, which slipped in about I sec. The seismic moment inferred is about 2.5 X 10(20) N m.
引用
收藏
页码:256 / 266
页数:11
相关论文
共 59 条
[1]   SEISMIC DISPLACEMENTS NEAR A FAULT [J].
AKI, K .
JOURNAL OF GEOPHYSICAL RESEARCH, 1968, 73 (16) :5359-&
[2]  
AKTAR M, 1999, AM GEOPH UN FALL M S, V80, pF649
[3]   RUPTURE VELOCITY OF PLANE STRAIN SHEAR CRACKS [J].
ANDREWS, DJ .
JOURNAL OF GEOPHYSICAL RESEARCH, 1976, 81 (32) :5679-5687
[4]   A FAULTING MODEL FOR THE 1979 IMPERIAL-VALLEY EARTHQUAKE [J].
ARCHULETA, RJ .
JOURNAL OF GEOPHYSICAL RESEARCH, 1984, 89 (NB6) :4559-4585
[5]  
ARCHULETA RJ, 1982, B SEISMOL SOC AM, V72, P1927
[6]  
ARMIJO R, 2000, 1999 IZMIT DUZCE EAR, P55
[7]   Microearthquake activity before the Izmit earthquake in the eastern Marmara region, Turkey (1 January 1993-17 August 1999) [J].
Baris, S ;
Ito, A ;
Üçer, SB ;
Honkura, Y ;
Kafadar, N ;
Pektas, R ;
Komut, T ;
Isikara, AM .
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 2002, 92 (01) :394-405
[8]   The surface rupture and slip distribution of the 17 August 1999 Izmit earthquake (M 7.4), North Anatolian fault [J].
Barka, A ;
Akyüz, HS ;
Altunel, E ;
Sunal, G ;
Çakir, Z ;
Dikbas, A ;
Yerli, B ;
Armijo, R ;
Meyer, B ;
de Chabalier, JB ;
Rockwell, T ;
Dolan, JR ;
Hartleb, R ;
Dawson, T ;
Christofferson, S ;
Tucker, A ;
Fumal, T ;
Langridge, R ;
Stenner, H ;
Lettis, W ;
Bachhuber, J ;
Page, W .
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 2002, 92 (01) :43-60
[9]  
BARKA A, 1999, AM GEOPH UN FALL M S, V80, pF647
[10]  
BOUCHON M, 1982, B SEISMOL SOC AM, V72, P745