期刊
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
卷 92, 期 1, 页码 256-266出版社
SEISMOLOGICAL SOC AMER
DOI: 10.1785/0120000845
关键词
-
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据