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首页> 外文期刊>Bulletin of the Seismological Society of America >Estimation of earthquake source parameters in the Kachchh seismic zone, Gujarat, India, from strong-motion network data using a generalized inversion technique
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Estimation of earthquake source parameters in the Kachchh seismic zone, Gujarat, India, from strong-motion network data using a generalized inversion technique

机译:使用广义反演技术从强运动网络数据估算印度古吉拉特邦Kachchh地震带的震源参数

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摘要

The generalized inversion of S-wave spectral amplitude data from 18 strong-motion sites in the Kachchh seismic zone, Gujarat, India, has been carried out to estimate source parameters of 38 aftershocks (M_w 2.93-5.32) from the 2001 Bhuj earthquake (M_w 7.7). The result shows that the seismic moment M0 and source radius r of aftershocks are between 3:1 × 10~(13) and 2:0 × 10~(17) N·m and 226-889 m, respectively, while stress drops (Δσ) vary from 0.11 to 7.44 MPa. The regression analysis between M_0 and r shows a break in linear scaling at M0 ≥ 1015:30 N·m. The estimated stress-drop values scatter significantly with M_0 (Δσ ∞ M~0_0:5-1) for larger aftershocks (M0 ≥ 1015:30 N·m) but vary in proportion with M0 (Δσ ∞ M~3_0) in case of smaller magnitude events. This can be due to the complex rupture process associated with relatively larger aftershocks in comparison to circular rupture for smaller events. The high stress-drop values are observed for events located on the north Wagad fault (at 15-30 km depths) and Gedi fault (at 0-5 km depths). This could be attributed to the large stress develop at the hypocentral depth as a result of high pore-fluid pressure beneath these two fault zones. The regression between M0 and corner frequency f_c shows M_0 is proportional to f~(5:84)_c, which is consistent for earthquakes with short rupture lengths and high stress-drop values. High stress-drop values commonly associated with the events from Kachchh and adjacent Narmada- Son lineament rift zones indicate strong potential for generating high peak ground accelerations and hence high seismic hazard.
机译:已对印度古吉拉特邦Kachchh地震带中18个强运动点的S波谱振幅数据进行了广义反演,以估算2001年普杰地震(M_w)造成的38次余震(M_w 2.93-5.32)的震源参数7.7)。结果表明,余震的地震矩M0和震源半径r分别在3:1×10〜(13)和2:0×10〜(17)N·m和226-889 m之间,而应力下降( Δσ)从0.11到7.44 MPa不等。 M_0和r之间的回归分析表明,在M0≥1015:30 N·m时,线性标度出现了中断。对于较大的余震(M0≥1015:30 N·m),估计的应力降值随M_0(Δσ∞M〜0_0:5-1)显着散布,但在以下情况下,与M0(Δσ∞M〜3_0)成比例变化较小的事件。这可能是由于与较小事件的圆形破裂相比,复杂的破裂过程与相对较大的余震有关。对于位于北瓦加德断层(深度为15-30 km)和格迪断层(深度为0-5 km)的事件,观察到了较高的应力降值。这可能归因于在这两个断层带下方的高孔隙流体压力,在低离心深度处产生了很大的应力。 M0与转折频率f_c之间的回归表明,M_0与f〜(5:84)_c成正比,这对于破裂长度短,应力降值高的地震是一致的。通常与Kachchh和相邻的Narmada-Son线裂谷带的事件相关的高应力降值表明产生高峰值地面加速度的强大潜力,因此也具有很高的地震危险。

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