The Radiated Energy of the 2004 Sumatra-Andaman Earthquake

The Radiated Energy of the 2004 Sumatra-Andaman Earthquake
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2004 年苏门答腊-安达曼地震的辐射能量

DOI：
10.1029/170gm07
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发表时间：
2013
期刊：
Geophysical monograph
影响因子：
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通讯作者：
Hiroo Kanamaori
Hiroo Kanamaori
中科院分区：
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文献类型：
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作者：
Hiroo Kanamaori

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我们使用几种独立的方法估计了苏门答腊-安达曼地震(Mw=9.0~9.3)的辐射能量E_R，并考察了南北破裂模式的差异是否反映在能量收支的差异上。首先，我们使用有限源模型，估计E_R为1.38×10^(17)J 频带f(频率)≤0.1HZ。由于该方法相对不受能量估计中常见的许多假设的影响，因此该值被认为是稳健的。为了估计0.1≤f≤1 Hz频段的E_R，我们用频域分析得到该频段的E_R=1.6x10^(17)J。由于传播过程中的能量衰减和近源结构的影响，这一估计在一定程度上是不确定的。我们还估计了相对于2001年印度布吉地震的E_R，其中E_R的可靠估计是 获得。由此估算的总E_R为3.0×10^(17)J，能量-力矩比为0.46×10^(-5)，略小于其他俯冲带大地震的能量矩比。用η_R=(2µ/Δ_r)(E_R/M_0)(µ=刚性，M_0=地震矩，Δr=静应力降)定义的辐射效率为0.16，小于许多大地震的辐射效率，介于规则值之间 地震和缓慢的海啸地震。尼科巴段、尼科巴-安达曼段和苏门答腊段的η_R值分别为0.053、0.11和0.21，表明北段的滑动涉及大量的能量 与充满水的厚重沉积物有关的消散。
We use several independent methods to estimate the radiated energy E_R of the Sumatra-Andaman earthquake (M_w=9.0 to 9.3), and investigate whether the difference in the rupture patterns between north and south is reflected in the difference in the energy budget. First, we used a finite source model and estimated E_R to be 1.38 x 10^(17) J for a frequency band f (frequency) ≤ 0.1 Hz. Since this method is relatively free from many assumptions commonly made in energy estimation, this value is considered robust. To estimate E_R for a frequency band 0.1 ≤ f ≤ 1 Hz, we used a frequency-domain analysis and obtained E_R = 1.6 x 10^(17) J for this frequency band. This estimate is somewhat uncertain because of the energy attenuation during propagation and the effect of the near-source structure. We also estimated E_R relative to the 2001 Bhuj, India, earthquakes for which a reliable estimate of E_R has been obtained. The total E_R thus estimated is 3.0 x 10^(17) J. The energy-moment ratio, 0.46 x 10^(-5), is slightly smaller than that for other large subduction-zone earthquakes. The radiation efficiency defined by η_R = (2µ /Δr)(E_R/M_0) (µ=rigidity, M_0=seismic moment, Δr =static stress drop) is 0.16 which is smaller than that of many large earthquakes, and is between the values of regular earthquakes and slow tsunami earthquakes. The values of η_R for the Nicobar segment, the Nicobar-Andaman segments combined, and the Sumatra segment are 0.053, 0.11, and 0.21, respectively, which suggests that the slip in the northern segments involves a large amount of energy dissipation associated with water-filled thick sediments.